6.3 Configuration Properties

Configuration properties define how Connector/J will make a connection to a MySQL server. Unless otherwise noted, properties can be set for a DataSource object or for a Connection object.

Configuration properties can be set in one of the following ways:

• Using the set*() methods on MySQL implementations of java.sql.DataSource (which is the preferred method when using implementations of java.sql.DataSource):

  • com.mysql.cj.jdbc.MysqlDataSource

  • com.mysql.cj.jdbc.MysqlConnectionPoolDataSource

• As a key/value pair in the java.util.Properties instance passed to DriverManager.getConnection() or Driver.connect()

• As a JDBC URL parameter in the URL given to java.sql.DriverManager.getConnection(), java.sql.Driver.connect() or the MySQL implementations of the javax.sql.DataSource setURL() method. If you specify a configuration property in the URL without providing a value for it, nothing will be set; for example, adding useServerPrepStmts alone to the URL does not make Connector/J use server-side prepared statements; you need to add useServerPrepStmts=true.

  Note

  If the mechanism you use to configure a JDBC URL is XML-based, use the XML character literal & to separate configuration parameters, as the ampersand is a reserved character for XML.

The properties are listed in the following tables.

Authentication. 

Properties and Descriptions
user The user to connect as Since version: all versions
password The password to use when connecting Since version: all versions

Connection. 

Properties and Descriptions
connectionAttributes A comma-delimited list of user-defined key:value pairs (in addition to standard MySQL-defined key:value pairs) to be passed to MySQL Server for display as connection attributes in the PERFORMANCE_SCHEMA.SESSION_CONNECT_ATTRS table. Example usage: connectionAttributes=key1:value1,key2:value2 This functionality is available for use with MySQL Server version 5.6 or later only. Earlier versions of MySQL Server do not support connection attributes, causing this configuration option to be ignored. Setting connectionAttributes=none will cause connection attribute processing to be bypassed, for situations where Connection creation/initialization speed is critical. Since version: 5.1.25
connectionLifecycleInterceptors A comma-delimited list of classes that implement "com.mysql.cj.jdbc.interceptors.ConnectionLifecycleInterceptor" that should notified of connection lifecycle events (creation, destruction, commit, rollback, setCatalog and setAutoCommit) and potentially alter the execution of these commands. ConnectionLifecycleInterceptors are "stackable", more than one interceptor may be specified via the configuration property as a comma-delimited list, with the interceptors executed in order from left to right. Since version: 5.1.4
useConfigs Load the comma-delimited list of configuration properties before parsing the URL or applying user-specified properties. These configurations are explained in the 'Configurations' of the documentation. Since version: 3.1.5
authenticationPlugins Comma-delimited list of classes that implement com.mysql.cj.protocol.AuthenticationPlugin and which will be used for authentication unless disabled by "disabledAuthenticationPlugins" property. Since version: 5.1.19
createDatabaseIfNotExist Creates the database given in the URL if it doesn't yet exist. Assumes the configured user has permissions to create databases. Default: false Since version: 3.1.9
defaultAuthenticationPlugin Name of a class implementing com.mysql.cj.protocol.AuthenticationPlugin which will be used as the default authentication plugin (see below). It is an error to use a class which is not listed in "authenticationPlugins" nor it is one of the built-in plugins. It is an error to set as default a plugin which was disabled with "disabledAuthenticationPlugins" property. It is an error to set this value to null or the empty string (i.e. there must be at least a valid default authentication plugin specified for the connection, meeting all constraints listed above). Default: com.mysql.cj.protocol.a.authentication.MysqlNativePasswordPlugin Since version: 5.1.19
detectCustomCollations Should the driver detect custom charsets/collations installed on server (true/false, defaults to 'false'). If this option set to 'true' driver gets actual charsets/collations from server each time connection establishes. This could slow down connection initialization significantly. Default: false Since version: 5.1.29
disabledAuthenticationPlugins Comma-delimited list of classes implementing com.mysql.cj.protocol.AuthenticationPlugin or mechanisms, i.e. "mysql_native_password". The authentication plugins or mechanisms listed will not be used for authentication which will fail if it requires one of them. It is an error to disable the default authentication plugin (either the one named by "defaultAuthenticationPlugin" property or the hard-coded one if "defaultAuthenticationPlugin" property is not set). Since version: 5.1.19
disconnectOnExpiredPasswords If "disconnectOnExpiredPasswords" is set to "false" and password is expired then server enters "sandbox" mode and sends ERR(08001, ER_MUST_CHANGE_PASSWORD) for all commands that are not needed to set a new password until a new password is set. Default: true Since version: 5.1.23
interactiveClient Set the CLIENT_INTERACTIVE flag, which tells MySQL to timeout connections based on INTERACTIVE_TIMEOUT instead of WAIT_TIMEOUT Default: false Since version: 3.1.0
passwordCharacterEncoding What character encoding is used for passwords? Leaving this set to the default value (null), uses the value set in "characterEncoding" if there is one, otherwise uses UTF-8 as default encoding. If the password contains non-ASCII characters, the password encoding must match what server encoding was set to when the password was created. For passwords in other character encodings, the encoding will have to be specified with this property (or with "characterEncoding"), as it's not possible for the driver to auto-detect this. Since version: 5.1.7
propertiesTransform An implementation of com.mysql.cj.conf.ConnectionPropertiesTransform that the driver will use to modify URL properties passed to the driver before attempting a connection Since version: 3.1.4
rollbackOnPooledClose Should the driver issue a rollback() when the logical connection in a pool is closed? Default: true Since version: 3.0.15
useAffectedRows Don't set the CLIENT_FOUND_ROWS flag when connecting to the server (not JDBC-compliant, will break most applications that rely on "found" rows vs. "affected rows" for DML statements), but does cause "correct" update counts from "INSERT ... ON DUPLICATE KEY UPDATE" statements to be returned by the server. Default: false Since version: 5.1.7

Session. 

Properties and Descriptions
characterEncoding What character encoding should the driver use when dealing with strings? (defaults is to 'autodetect') Since version: 1.1g
characterSetResults Character set to tell the server to return results as. Since version: 3.0.13
connectionCollation If set, tells the server to use this collation via 'set collation_connection' Since version: 3.0.13
sessionVariables A comma or semicolon separated list of name=value pairs to be sent as SET [SESSION] ... to the server when the driver connects. Since version: 3.1.8
useOldUTF8Behavior Use the UTF-8 behavior the driver did when communicating with 4.0 and older servers Default: false Since version: 3.1.6

Networking. 

Properties and Descriptions
socksProxyHost Name or IP address of SOCKS host to connect through. Since version: 5.1.34
socksProxyPort Port of SOCKS server. Default: 1080 Since version: 5.1.34
socketFactory The name of the class that the driver should use for creating socket connections to the server. This class must implement the interface 'com.mysql.cj.protocol.SocketFactory' and have public no-args constructor. Default: com.mysql.cj.protocol.StandardSocketFactory Since version: 3.0.3
connectTimeout Timeout for socket connect (in milliseconds), with 0 being no timeout. Only works on JDK-1.4 or newer. Defaults to '0'. Default: 0 Since version: 3.0.1
socketTimeout Timeout (in milliseconds) on network socket operations (0, the default means no timeout). Default: 0 Since version: 3.0.1
localSocketAddress Hostname or IP address given to explicitly configure the interface that the driver will bind the client side of the TCP/IP connection to when connecting. Since version: 5.0.5
maxAllowedPacket Maximum allowed packet size to send to server. If not set, the value of system variable 'max_allowed_packet' will be used to initialize this upon connecting. This value will not take effect if set larger than the value of 'max_allowed_packet'. Also, due to an internal dependency with the property "blobSendChunkSize", this setting has a minimum value of "8203" if "useServerPrepStmts" is set to "true". Default: 65535 Since version: 5.1.8
tcpKeepAlive If connecting using TCP/IP, should the driver set SO_KEEPALIVE? Default: true Since version: 5.0.7
tcpNoDelay If connecting using TCP/IP, should the driver set SO_TCP_NODELAY (disabling the Nagle Algorithm)? Default: true Since version: 5.0.7
tcpRcvBuf If connecting using TCP/IP, should the driver set SO_RCV_BUF to the given value? The default value of '0', means use the platform default value for this property) Default: 0 Since version: 5.0.7
tcpSndBuf If connecting using TCP/IP, should the driver set SO_SND_BUF to the given value? The default value of '0', means use the platform default value for this property) Default: 0 Since version: 5.0.7
tcpTrafficClass If connecting using TCP/IP, should the driver set traffic class or type-of-service fields ?See the documentation for java.net.Socket.setTrafficClass() for more information. Default: 0 Since version: 5.0.7
useCompression Use zlib compression when communicating with the server (true/false)? Defaults to 'false'. Default: false Since version: 3.0.17
useUnbufferedInput Don't use BufferedInputStream for reading data from the server Default: true Since version: 3.0.11

Security. 

Properties and Descriptions
allowMultiQueries Allow the use of ';' to delimit multiple queries during one statement (true/false), defaults to 'false', and does not affect the addBatch() and executeBatch() methods, which instead rely on rewriteBatchStatements. Default: false Since version: 3.1.1
useSSL Use SSL when communicating with the server (true/false), default is 'true' when connecting to MySQL 5.5.45+, 5.6.26+ or 5.7.6+, otherwise default is 'false' Default: false Since version: 3.0.2
requireSSL Require server support of SSL connection if useSSL=true? (defaults to 'false'). Default: false Since version: 3.1.0
verifyServerCertificate If "useSSL" is set to "true", should the driver verify the server's certificate? When using this feature, the keystore parameters should be specified by the "clientCertificateKeyStore*" properties, rather than system properties. Default is 'false' when connecting to MySQL 5.5.45+, 5.6.26+ or 5.7.6+ and "useSSL" was not explicitly set to "true". Otherwise default is 'true' Default: true Since version: 5.1.6
clientCertificateKeyStoreUrl URL to the client certificate KeyStore (if not specified, use defaults) Since version: 5.1.0
clientCertificateKeyStoreType KeyStore type for client certificates (NULL or empty means use the default, which is "JKS". Standard keystore types supported by the JVM are "JKS" and "PKCS12", your environment may have more available depending on what security products are installed and available to the JVM. Default: JKS Since version: 5.1.0
clientCertificateKeyStorePassword Password for the client certificates KeyStore Since version: 5.1.0
trustCertificateKeyStoreUrl URL to the trusted root certificate KeyStore (if not specified, use defaults) Since version: 5.1.0
trustCertificateKeyStoreType KeyStore type for trusted root certificates (NULL or empty means use the default, which is "JKS". Standard keystore types supported by the JVM are "JKS" and "PKCS12", your environment may have more available depending on what security products are installed and available to the JVM. Default: JKS Since version: 5.1.0
trustCertificateKeyStorePassword Password for the trusted root certificates KeyStore Since version: 5.1.0
enabledSSLCipherSuites If "useSSL" is set to "true", overrides the cipher suites enabled for use on the underlying SSL sockets. This may be required when using external JSSE providers or to specify cipher suites compatible with both MySQL server and used JVM. Since version: 5.1.35
enabledTLSProtocols If "useSSL" is set to "true", overrides the TLS protocols enabled for use on the underlying SSL sockets. This may be used to restrict connections to specific TLS versions. Since version: 8.0.8
allowLoadLocalInfile Should the driver allow use of 'LOAD DATA LOCAL INFILE...' (defaults to 'true'). Default: true Since version: 3.0.3
allowUrlInLocalInfile Should the driver allow URLs in 'LOAD DATA LOCAL INFILE' statements? Default: false Since version: 3.1.4
allowPublicKeyRetrieval Allows special handshake roundtrip to get server RSA public key directly from server. Default: false Since version: 5.1.31
paranoid Take measures to prevent exposure sensitive information in error messages and clear data structures holding sensitive data when possible? (defaults to 'false') Default: false Since version: 3.0.1
serverRSAPublicKeyFile File path to the server RSA public key file for sha256_password authentication. If not specified, the public key will be retrieved from the server. Since version: 5.1.31

Statements. 

Properties and Descriptions
continueBatchOnError Should the driver continue processing batch commands if one statement fails. The JDBC spec allows either way (defaults to 'true'). Default: true Since version: 3.0.3
dontTrackOpenResources The JDBC specification requires the driver to automatically track and close resources, however if your application doesn't do a good job of explicitly calling close() on statements or result sets, this can cause memory leakage. Setting this property to true relaxes this constraint, and can be more memory efficient for some applications. Also the automatic closing of the Statement and current ResultSet in Statement.closeOnCompletion() and Statement.getMoreResults ([Statement.CLOSE_CURRENT_RESULT | Statement.CLOSE_ALL_RESULTS]), respectively, ceases to happen. This property automatically sets holdResultsOpenOverStatementClose=true. Default: false Since version: 3.1.7
queryInterceptors A comma-delimited list of classes that implement "com.mysql.cj.interceptors.QueryInterceptor" that should be placed "in between" query execution to influence the results. QueryInterceptors are "chainable", the results returned by the "current" interceptor will be passed on to the next in in the chain, from left-to-right order, as specified in this property. Since version: 8.0.7
queryTimeoutKillsConnection If the timeout given in Statement.setQueryTimeout() expires, should the driver forcibly abort the Connection instead of attempting to abort the query? Default: false Since version: 5.1.9

Prepared Statements. 

Properties and Descriptions
allowNanAndInf Should the driver allow NaN or +/- INF values in PreparedStatement.setDouble()? Default: false Since version: 3.1.5
autoClosePStmtStreams Should the driver automatically call .close() on streams/readers passed as arguments via set*() methods? Default: false Since version: 3.1.12
compensateOnDuplicateKeyUpdateCounts Should the driver compensate for the update counts of "ON DUPLICATE KEY" INSERT statements (2 = 1, 0 = 1) when using prepared statements? Default: false Since version: 5.1.7
emulateUnsupportedPstmts Should the driver detect prepared statements that are not supported by the server, and replace them with client-side emulated versions? Default: true Since version: 3.1.7
generateSimpleParameterMetadata Should the driver generate simplified parameter metadata for PreparedStatements when no metadata is available either because the server couldn't support preparing the statement, or server-side prepared statements are disabled? Default: false Since version: 5.0.5
processEscapeCodesForPrepStmts Should the driver process escape codes in queries that are prepared? Default escape processing behavior in non-prepared statements must be defined with the property 'enableEscapeProcessing'. Default: true Since version: 3.1.12
useServerPrepStmts Use server-side prepared statements if the server supports them? Default: false Since version: 3.1.0
useStreamLengthsInPrepStmts Honor stream length parameter in PreparedStatement/ResultSet.setXXXStream() method calls (true/false, defaults to 'true')? Default: true Since version: 3.0.2

Result Sets. 

Properties and Descriptions
clobberStreamingResults This will cause a 'streaming' ResultSet to be automatically closed, and any outstanding data still streaming from the server to be discarded if another query is executed before all the data has been read from the server. Default: false Since version: 3.0.9
emptyStringsConvertToZero Should the driver allow conversions from empty string fields to numeric values of '0'? Default: true Since version: 3.1.8
holdResultsOpenOverStatementClose Should the driver close result sets on Statement.close() as required by the JDBC specification? Default: false Since version: 3.1.7
jdbcCompliantTruncation Should the driver throw java.sql.DataTruncation exceptions when data is truncated as is required by the JDBC specification when connected to a server that supports warnings (MySQL 4.1.0 and newer)? This property has no effect if the server sql-mode includes STRICT_TRANS_TABLES. Default: true Since version: 3.1.2
maxRows The maximum number of rows to return (0, the default means return all rows). Default: -1 Since version: all versions
netTimeoutForStreamingResults What value should the driver automatically set the server setting 'net_write_timeout' to when the streaming result sets feature is in use? (value has unit of seconds, the value '0' means the driver will not try and adjust this value) Default: 600 Since version: 5.1.0
padCharsWithSpace If a result set column has the CHAR type and the value does not fill the amount of characters specified in the DDL for the column, should the driver pad the remaining characters with space (for ANSI compliance)? Default: false Since version: 5.0.6
populateInsertRowWithDefaultValues When using ResultSets that are CONCUR_UPDATABLE, should the driver pre-populate the "insert" row with default values from the DDL for the table used in the query so those values are immediately available for ResultSet accessors? This functionality requires a call to the database for metadata each time a result set of this type is created. If disabled (the default), the default values will be populated by the an internal call to refreshRow() which pulls back default values and/or values changed by triggers. Default: false Since version: 5.0.5
strictUpdates Should the driver do strict checking (all primary keys selected) of updatable result sets (true, false, defaults to 'true')? Default: true Since version: 3.0.4
tinyInt1isBit Should the driver treat the datatype TINYINT(1) as the BIT type (because the server silently converts BIT -> TINYINT(1) when creating tables)? Default: true Since version: 3.0.16
transformedBitIsBoolean If the driver converts TINYINT(1) to a different type, should it use BOOLEAN instead of BIT for future compatibility with MySQL-5.0, as MySQL-5.0 has a BIT type? Default: false Since version: 3.1.9

Metadata. 

Properties and Descriptions
getProceduresReturnsFunctions Pre-JDBC4 DatabaseMetaData API has only the getProcedures() and getProcedureColumns() methods, so they return metadata info for both stored procedures and functions. JDBC4 was extended with the getFunctions() and getFunctionColumns() methods and the expected behaviours of previous methods are not well defined. For JDBC4 and higher, default 'true' value of the option means that calls of DatabaseMetaData.getProcedures() and DatabaseMetaData.getProcedureColumns() return metadata for both procedures and functions as before, keeping backward compatibility. Setting this property to 'false' decouples Connector/J from its pre-JDBC4 behaviours for DatabaseMetaData.getProcedures() and DatabaseMetaData.getProcedureColumns(), forcing them to return metadata for procedures only. Default: true Since version: 5.1.26
noAccessToProcedureBodies When determining procedure parameter types for CallableStatements, and the connected user can't access procedure bodies through "SHOW CREATE PROCEDURE" or select on mysql.proc should the driver instead create basic metadata (all parameters reported as INOUT VARCHARs) instead of throwing an exception? Default: false Since version: 5.0.3
nullCatalogMeansCurrent When DatabaseMetadataMethods ask for a 'catalog' parameter, does the value null mean use the current catalog? Default: false Since version: 3.1.8
useHostsInPrivileges Add '@hostname' to users in DatabaseMetaData.getColumn/TablePrivileges() (true/false), defaults to 'true'. Default: true Since version: 3.0.2
useInformationSchema Should the driver use the INFORMATION_SCHEMA to derive information used by DatabaseMetaData? Default is 'true' when connecting to MySQL 8.0.3+, otherwise default is 'false'. Default: false Since version: 5.0.0

BLOB/CLOB processing. 

Properties and Descriptions
autoDeserialize Should the driver automatically detect and de-serialize objects stored in BLOB fields? Default: false Since version: 3.1.5
blobSendChunkSize Chunk size to use when sending BLOB/CLOBs via ServerPreparedStatements. Note that this value cannot exceed the value of "maxAllowedPacket" and, if that is the case, then this value will be corrected automatically. Default: 1048576 Since version: 3.1.9
blobsAreStrings Should the driver always treat BLOBs as Strings - specifically to work around dubious metadata returned by the server for GROUP BY clauses? Default: false Since version: 5.0.8
clobCharacterEncoding The character encoding to use for sending and retrieving TEXT, MEDIUMTEXT and LONGTEXT values instead of the configured connection characterEncoding Since version: 5.0.0
emulateLocators Should the driver emulate java.sql.Blobs with locators? With this feature enabled, the driver will delay loading the actual Blob data until the one of the retrieval methods (getInputStream(), getBytes(), and so forth) on the blob data stream has been accessed. For this to work, you must use a column alias with the value of the column to the actual name of the Blob. The feature also has the following restrictions: The SELECT that created the result set must reference only one table, the table must have a primary key; the SELECT must alias the original blob column name, specified as a string, to an alternate name; the SELECT must cover all columns that make up the primary key. Default: false Since version: 3.1.0
functionsNeverReturnBlobs Should the driver always treat data from functions returning BLOBs as Strings - specifically to work around dubious metadata returned by the server for GROUP BY clauses? Default: false Since version: 5.0.8
locatorFetchBufferSize If 'emulateLocators' is configured to 'true', what size buffer should be used when fetching BLOB data for getBinaryInputStream? Default: 1048576 Since version: 3.2.1

Datetime types processing. 

Properties and Descriptions
noDatetimeStringSync Don't ensure that ResultSet.getDatetimeType().toString().equals(ResultSet.getString()) Default: false Since version: 3.1.7
sendFractionalSeconds Send fractional part from TIMESTAMP seconds. If set to false, the nanoseconds value of TIMESTAMP values will be truncated before sending any data to the server. This option applies only to prepared statements, callable statements or updatable result sets. Default: true Since version: 5.1.37
serverTimezone Override detection/mapping of time zone. Used when time zone from server doesn't map to Java time zone Since version: 3.0.2
treatUtilDateAsTimestamp Should the driver treat java.util.Date as a TIMESTAMP for the purposes of PreparedStatement.setObject()? Default: true Since version: 5.0.5
yearIsDateType Should the JDBC driver treat the MySQL type "YEAR" as a java.sql.Date, or as a SHORT? Default: true Since version: 3.1.9
zeroDateTimeBehavior What should happen when the driver encounters DATETIME values that are composed entirely of zeros (used by MySQL to represent invalid dates)? Valid values are "EXCEPTION", "ROUND" and "CONVERT_TO_NULL". Default: EXCEPTION Since version: 3.1.4

High Availability and Clustering. 

Properties and Descriptions
autoReconnect Should the driver try to re-establish stale and/or dead connections? If enabled the driver will throw an exception for a queries issued on a stale or dead connection, which belong to the current transaction, but will attempt reconnect before the next query issued on the connection in a new transaction. The use of this feature is not recommended, because it has side effects related to session state and data consistency when applications don't handle SQLExceptions properly, and is only designed to be used when you are unable to configure your application to handle SQLExceptions resulting from dead and stale connections properly. Alternatively, as a last option, investigate setting the MySQL server variable "wait_timeout" to a high value, rather than the default of 8 hours. Default: false Since version: 1.1
autoReconnectForPools Use a reconnection strategy appropriate for connection pools (defaults to 'false') Default: false Since version: 3.1.3
failOverReadOnly When failing over in autoReconnect mode, should the connection be set to 'read-only'? Default: true Since version: 3.0.12
maxReconnects Maximum number of reconnects to attempt if autoReconnect is true, default is '3'. Default: 3 Since version: 1.1
reconnectAtTxEnd If autoReconnect is set to true, should the driver attempt reconnections at the end of every transaction? Default: false Since version: 3.0.10
retriesAllDown When using loadbalancing or failover, the number of times the driver should cycle through available hosts, attempting to connect. Between cycles, the driver will pause for 250ms if no servers are available. Default: 120 Since version: 5.1.6
initialTimeout If autoReconnect is enabled, the initial time to wait between re-connect attempts (in seconds, defaults to '2'). Default: 2 Since version: 1.1
queriesBeforeRetryMaster Number of queries to issue before falling back to the primary host when failed over (when using multi-host failover). Whichever condition is met first, 'queriesBeforeRetryMaster' or 'secondsBeforeRetryMaster' will cause an attempt to be made to reconnect to the primary host. Setting both properties to 0 disables the automatic fall back to the primary host at transaction boundaries. Defaults to 50. Default: 50 Since version: 3.0.2
secondsBeforeRetryMaster How long should the driver wait, when failed over, before attempting to reconnect to the primary host? Whichever condition is met first, 'queriesBeforeRetryMaster' or 'secondsBeforeRetryMaster' will cause an attempt to be made to reconnect to the master. Setting both properties to 0 disables the automatic fall back to the primary host at transaction boundaries. Time in seconds, defaults to 30 Default: 30 Since version: 3.0.2
allowMasterDownConnections By default, a replication-aware connection will fail to connect when configured master hosts are all unavailable at initial connection. Setting this property to 'true' allows to establish the initial connection, by failing over to the slave servers, in read-only state. It won't prevent subsequent failures when switching back to the master hosts i.e. by setting the replication connection to read/write state. Default: false Since version: 5.1.27
allowSlaveDownConnections By default, a replication-aware connection will fail to connect when configured slave hosts are all unavailable at initial connection. Setting this property to 'true' allows to establish the initial connection. It won't prevent failures when switching to slaves i.e. by setting the replication connection to read-only state. The property 'readFromMasterWhenNoSlaves' should be used for this purpose. Default: false Since version: 6.0.2
ha.enableJMX Enables JMX-based management of load-balanced connection groups, including live addition/removal of hosts from load-balancing pool. Enables JMX-based management of replication connection groups, including live slave promotion, addition of new slaves and removal of master or slave hosts from load-balanced master and slave connection pools. Default: false Since version: 5.1.27
loadBalanceHostRemovalGracePeriod Sets the grace period to wait for a host being removed from a load-balanced connection, to be released when it is currently the active host. Default: 15000 Since version: 6.0.3
readFromMasterWhenNoSlaves Replication-aware connections distribute load by using the master hosts when in read/write state and by using the slave hosts when in read-only state. If, when setting the connection to read-only state, none of the slave hosts are available, an SQLExeception is thrown back. Setting this property to 'true' allows to fail over to the master hosts, while setting the connection state to read-only, when no slave hosts are available at switch instant. Default: false Since version: 6.0.2
selfDestructOnPingMaxOperations If set to a non-zero value, the driver will report close the connection and report failure when Connection.ping() or Connection.isValid(int) is called if the connection's count of commands sent to the server exceeds this value. Default: 0 Since version: 5.1.6
selfDestructOnPingSecondsLifetime If set to a non-zero value, the driver will close the connection and report failure when Connection.ping() or Connection.isValid(int) is called if the connection's lifetime exceeds this value (in milliseconds). Default: 0 Since version: 5.1.6
ha.loadBalanceStrategy If using a load-balanced connection to connect to SQL nodes in a MySQL Cluster/NDB configuration (by using the URL prefix "jdbc:mysql:loadbalance://"), which load balancing algorithm should the driver use: (1) "random" - the driver will pick a random host for each request. This tends to work better than round-robin, as the randomness will somewhat account for spreading loads where requests vary in response time, while round-robin can sometimes lead to overloaded nodes if there are variations in response times across the workload. (2) "bestResponseTime" - the driver will route the request to the host that had the best response time for the previous transaction. (3) "serverAffinity" - the driver initially attempts to enforce server affinity while still respecting and benefiting from the fault tolerance aspects of the load-balancing implementation. The server affinity ordered list is provided using the property 'serverAffinityOrder'. If none of the servers listed in the affinity list is responsive, the driver then refers to the "random" strategy to proceed with choosing the next server. Default: random Since version: 5.0.6
loadBalanceAutoCommitStatementRegex When load-balancing is enabled for auto-commit statements (via loadBalanceAutoCommitStatementThreshold), the statement counter will only increment when the SQL matches the regular expression. By default, every statement issued matches. Since version: 5.1.15
loadBalanceAutoCommitStatementThreshold When auto-commit is enabled, the number of statements which should be executed before triggering load-balancing to rebalance. Default value of 0 causes load-balanced connections to only rebalance when exceptions are encountered, or auto-commit is disabled and transactions are explicitly committed or rolled back. Default: 0 Since version: 5.1.15
loadBalanceBlacklistTimeout Time in milliseconds between checks of servers which are unavailable, by controlling how long a server lives in the global blacklist. Default: 0 Since version: 5.1.0
loadBalanceConnectionGroup Logical group of load-balanced connections within a classloader, used to manage different groups independently. If not specified, live management of load-balanced connections is disabled. Since version: 5.1.13
loadBalanceExceptionChecker Fully-qualified class name of custom exception checker. The class must implement com.mysql.cj.jdbc.ha.LoadBalanceExceptionChecker interface, and is used to inspect SQLExceptions and determine whether they should trigger fail-over to another host in a load-balanced deployment. Default: com.mysql.cj.jdbc.ha.StandardLoadBalanceExceptionChecker Since version: 5.1.13
loadBalancePingTimeout Time in milliseconds to wait for ping response from each of load-balanced physical connections when using load-balanced Connection. Default: 0 Since version: 5.1.13
loadBalanceSQLExceptionSubclassFailover Comma-delimited list of classes/interfaces used by default load-balanced exception checker to determine whether a given SQLException should trigger failover. The comparison is done using Class.isInstance(SQLException) using the thrown SQLException. Since version: 5.1.13
loadBalanceSQLStateFailover Comma-delimited list of SQLState codes used by default load-balanced exception checker to determine whether a given SQLException should trigger failover. The SQLState of a given SQLException is evaluated to determine whether it begins with any value in the comma-delimited list. Since version: 5.1.13
loadBalanceValidateConnectionOnSwapServer Should the load-balanced Connection explicitly check whether the connection is live when swapping to a new physical connection at commit/rollback? Default: false Since version: 5.1.13
pinGlobalTxToPhysicalConnection When using XAConnections, should the driver ensure that operations on a given XID are always routed to the same physical connection? This allows the XAConnection to support "XA START ... JOIN" after "XA END" has been called Default: false Since version: 5.0.1
replicationConnectionGroup Logical group of replication connections within a classloader, used to manage different groups independently. If not specified, live management of replication connections is disabled. Since version: 8.0.7
resourceId A globally unique name that identifies the resource that this datasource or connection is connected to, used for XAResource.isSameRM() when the driver can't determine this value based on hostnames used in the URL Since version: 5.0.1
serverAffinityOrder A comma separated list containing the host/port pairs that are to be used in load-balancing "serverAffinity" strategy. Only the sub-set of the hosts enumerated in the main hosts section in this URL will be used and they must be identical in case and type, i.e., can't use an IP address in one place and the corresponding host name in the other. Since version: 8.0.8

Performance Extensions. 

Properties and Descriptions
callableStmtCacheSize If 'cacheCallableStmts' is enabled, how many callable statements should be cached? Default: 100 Since version: 3.1.2
metadataCacheSize The number of queries to cache ResultSetMetadata for if cacheResultSetMetaData is set to 'true' (default 50) Default: 50 Since version: 3.1.1
useLocalSessionState Should the driver refer to the internal values of autocommit and transaction isolation that are set by Connection.setAutoCommit() and Connection.setTransactionIsolation() and transaction state as maintained by the protocol, rather than querying the database or blindly sending commands to the database for commit() or rollback() method calls? Default: false Since version: 3.1.7
useLocalTransactionState Should the driver use the in-transaction state provided by the MySQL protocol to determine if a commit() or rollback() should actually be sent to the database? Default: false Since version: 5.1.7
prepStmtCacheSize If prepared statement caching is enabled, how many prepared statements should be cached? Default: 25 Since version: 3.0.10
prepStmtCacheSqlLimit If prepared statement caching is enabled, what's the largest SQL the driver will cache the parsing for? Default: 256 Since version: 3.0.10
parseInfoCacheFactory Name of a class implementing com.mysql.cj.CacheAdapterFactory, which will be used to create caches for the parsed representation of client-side prepared statements. Default: com.mysql.cj.PerConnectionLRUFactory Since version: 5.1.1
serverConfigCacheFactory Name of a class implementing com.mysql.cj.CacheAdapterFactory<String, Map<String, String>>, which will be used to create caches for MySQL server configuration values Default: com.mysql.cj.util.PerVmServerConfigCacheFactory Since version: 5.1.1
alwaysSendSetIsolation Should the driver always communicate with the database when Connection.setTransactionIsolation() is called? If set to false, the driver will only communicate with the database when the requested transaction isolation is different than the whichever is newer, the last value that was set via Connection.setTransactionIsolation(), or the value that was read from the server when the connection was established. Note that useLocalSessionState=true will force the same behavior as alwaysSendSetIsolation=false, regardless of how alwaysSendSetIsolation is set. Default: true Since version: 3.1.7
maintainTimeStats Should the driver maintain various internal timers to enable idle time calculations as well as more verbose error messages when the connection to the server fails? Setting this property to false removes at least two calls to System.getCurrentTimeMillis() per query. Default: true Since version: 3.1.9
useCursorFetch Should the driver use cursor-based fetching to retrieve rows? If set to "true" and "defaultFetchSize" > 0 (or setFetchSize() > 0 is called on a statement) then the cursor-based result set will be used. Please note that "useServerPrepStmts" is automatically set to "true" in this case because cursor functionality is available only for server-side prepared statements. Default: false Since version: 5.0.0
cacheCallableStmts Should the driver cache the parsing stage of CallableStatements Default: false Since version: 3.1.2
cachePrepStmts Should the driver cache the parsing stage of PreparedStatements of client-side prepared statements, the "check" for suitability of server-side prepared and server-side prepared statements themselves? Default: false Since version: 3.0.10
cacheResultSetMetadata Should the driver cache ResultSetMetaData for Statements and PreparedStatements? (Req. JDK-1.4+, true/false, default 'false') Default: false Since version: 3.1.1
cacheServerConfiguration Should the driver cache the results of 'SHOW VARIABLES' and 'SHOW COLLATION' on a per-URL basis? Default: false Since version: 3.1.5
defaultFetchSize The driver will call setFetchSize(n) with this value on all newly-created Statements Default: 0 Since version: 3.1.9
dontCheckOnDuplicateKeyUpdateInSQL Stops checking if every INSERT statement contains the "ON DUPLICATE KEY UPDATE" clause. As a side effect, obtaining the statement's generated keys information will return a list where normally it wouldn't. Also be aware that, in this case, the list of generated keys returned may not be accurate. The effect of this property is canceled if set simultaneously with 'rewriteBatchedStatements=true'. Default: false Since version: 5.1.32
elideSetAutoCommits If using MySQL-4.1 or newer, should the driver only issue 'set autocommit=n' queries when the server's state doesn't match the requested state by Connection.setAutoCommit(boolean)? Default: false Since version: 3.1.3
enableEscapeProcessing Sets the default escape processing behavior for Statement objects. The method Statement.setEscapeProcessing() can be used to specify the escape processing behavior for an individual Statement object. Default escape processing behavior in prepared statements must be defined with the property 'processEscapeCodesForPrepStmts'. Default: true Since version: 6.0.1
enableQueryTimeouts When enabled, query timeouts set via Statement.setQueryTimeout() use a shared java.util.Timer instance for scheduling. Even if the timeout doesn't expire before the query is processed, there will be memory used by the TimerTask for the given timeout which won't be reclaimed until the time the timeout would have expired if it hadn't been cancelled by the driver. High-load environments might want to consider disabling this functionality. Default: true Since version: 5.0.6
largeRowSizeThreshold What size result set row should the JDBC driver consider "large", and thus use a more memory-efficient way of representing the row internally? Default: 2048 Since version: 5.1.1
readOnlyPropagatesToServer Should the driver issue appropriate statements to implicitly set the transaction access mode on server side when Connection.setReadOnly() is called? Setting this property to 'true' enables InnoDB read-only potential optimizations but also requires an extra roundtrip to set the right transaction state. Even if this property is set to 'false', the driver will do its best effort to prevent the execution of database-state-changing queries. Requires minimum of MySQL 5.6. Default: true Since version: 5.1.35
rewriteBatchedStatements Should the driver use multiqueries (irregardless of the setting of "allowMultiQueries") as well as rewriting of prepared statements for INSERT into multi-value inserts when executeBatch() is called? Notice that this has the potential for SQL injection if using plain java.sql.Statements and your code doesn't sanitize input correctly. Notice that for prepared statements, server-side prepared statements can not currently take advantage of this rewrite option, and that if you don't specify stream lengths when using PreparedStatement.set*Stream(), the driver won't be able to determine the optimum number of parameters per batch and you might receive an error from the driver that the resultant packet is too large. Statement.getGeneratedKeys() for these rewritten statements only works when the entire batch includes INSERT statements. Please be aware using rewriteBatchedStatements=true with INSERT .. ON DUPLICATE KEY UPDATE that for rewritten statement server returns only one value as sum of all affected (or found) rows in batch and it isn't possible to map it correctly to initial statements; in this case driver returns 0 as a result of each batch statement if total count was 0, and the Statement.SUCCESS_NO_INFO as a result of each batch statement if total count was > 0. Default: false Since version: 3.1.13
useReadAheadInput Use newer, optimized non-blocking, buffered input stream when reading from the server? Default: true Since version: 3.1.5

Debugging/Profiling. 

Properties and Descriptions
logger The name of a class that implements "com.mysql.cj.log.Log" that will be used to log messages to. (default is "com.mysql.cj.log.StandardLogger", which logs to STDERR) Default: com.mysql.cj.log.StandardLogger Since version: 3.1.1
gatherPerfMetrics Should the driver gather performance metrics, and report them via the configured logger every 'reportMetricsIntervalMillis' milliseconds? Default: false Since version: 3.1.2
profileSQL Trace queries and their execution/fetch times to the configured logger (true/false) defaults to 'false' Default: false Since version: 3.1.0
reportMetricsIntervalMillis If 'gatherPerfMetrics' is enabled, how often should they be logged (in ms)? Default: 30000 Since version: 3.1.2
maxQuerySizeToLog Controls the maximum length/size of a query that will get logged when profiling or tracing Default: 2048 Since version: 3.1.3
packetDebugBufferSize The maximum number of packets to retain when 'enablePacketDebug' is true Default: 20 Since version: 3.1.3
slowQueryThresholdMillis If 'logSlowQueries' is enabled, how long should a query (in ms) before it is logged as 'slow'? Default: 2000 Since version: 3.1.2
slowQueryThresholdNanos If 'useNanosForElapsedTime' is set to true, and this property is set to a non-zero value, the driver will use this threshold (in nanosecond units) to determine if a query was slow. Default: 0 Since version: 5.0.7
useUsageAdvisor Should the driver issue 'usage' warnings advising proper and efficient usage of JDBC and MySQL Connector/J to the log (true/false, defaults to 'false')? Default: false Since version: 3.1.1
autoGenerateTestcaseScript Should the driver dump the SQL it is executing, including server-side prepared statements to STDERR? Default: false Since version: 3.1.9
autoSlowLog Instead of using slowQueryThreshold* to determine if a query is slow enough to be logged, maintain statistics that allow the driver to determine queries that are outside the 99th percentile? Default: true Since version: 5.1.4
clientInfoProvider The name of a class that implements the com.mysql.cj.jdbc.ClientInfoProvider interface in order to support JDBC-4.0's Connection.get/setClientInfo() methods Default: com.mysql.cj.jdbc.CommentClientInfoProvider Since version: 5.1.0
enablePacketDebug When enabled, a ring-buffer of 'packetDebugBufferSize' packets will be kept, and dumped when exceptions are thrown in key areas in the driver's code Default: false Since version: 3.1.3
explainSlowQueries If 'logSlowQueries' is enabled, should the driver automatically issue an 'EXPLAIN' on the server and send the results to the configured log at a WARN level? Default: false Since version: 3.1.2
logSlowQueries Should queries that take longer than 'slowQueryThresholdMillis' be logged? Default: false Since version: 3.1.2
logXaCommands Should the driver log XA commands sent by MysqlXaConnection to the server, at the DEBUG level of logging? Default: false Since version: 5.0.5
profilerEventHandler Name of a class that implements the interface com.mysql.cj.log.ProfilerEventHandler that will be used to handle profiling/tracing events. Default: com.mysql.cj.log.LoggingProfilerEventHandler Since version: 5.1.6
resultSetSizeThreshold If the usage advisor is enabled, how many rows should a result set contain before the driver warns that it is suspiciously large? Default: 100 Since version: 5.0.5
traceProtocol Should trace-level network protocol be logged? Default: false Since version: 3.1.2
useNanosForElapsedTime For profiling/debugging functionality that measures elapsed time, should the driver try to use nanoseconds resolution if available (JDK >= 1.5)? Default: false Since version: 5.0.7
useOnlyServerErrorMessages Don't prepend 'standard' SQLState error messages to error messages returned by the server. Default: true Since version: 3.0.15

Exceptions/Warnings. 

Properties and Descriptions
dumpQueriesOnException Should the driver dump the contents of the query sent to the server in the message for SQLExceptions? Default: false Since version: 3.1.3
exceptionInterceptors Comma-delimited list of classes that implement com.mysql.cj.exceptions.ExceptionInterceptor. These classes will be instantiated one per Connection instance, and all SQLExceptions thrown by the driver will be allowed to be intercepted by these interceptors, in a chained fashion, with the first class listed as the head of the chain. Since version: 5.1.8
ignoreNonTxTables Ignore non-transactional table warning for rollback? (defaults to 'false'). Default: false Since version: 3.0.9
includeInnodbStatusInDeadlockExceptions Include the output of "SHOW ENGINE INNODB STATUS" in exception messages when deadlock exceptions are detected? Default: false Since version: 5.0.7
includeThreadDumpInDeadlockExceptions Include a current Java thread dump in exception messages when deadlock exceptions are detected? Default: false Since version: 5.1.15
includeThreadNamesAsStatementComment Include the name of the current thread as a comment visible in "SHOW PROCESSLIST", or in Innodb deadlock dumps, useful in correlation with "includeInnodbStatusInDeadlockExceptions=true" and "includeThreadDumpInDeadlockExceptions=true". Default: false Since version: 5.1.15

Tunes for integration with other products. 

Properties and Descriptions
overrideSupportsIntegrityEnhancementFacility Should the driver return "true" for DatabaseMetaData.supportsIntegrityEnhancementFacility() even if the database doesn't support it to workaround applications that require this method to return "true" to signal support of foreign keys, even though the SQL specification states that this facility contains much more than just foreign key support (one such application being OpenOffice)? Default: false Since version: 3.1.12
ultraDevHack Create PreparedStatements for prepareCall() when required, because UltraDev is broken and issues a prepareCall() for _all_ statements? (true/false, defaults to 'false') Default: false Since version: 2.0.3

JDBC compliance. 

Properties and Descriptions
useColumnNamesInFindColumn Prior to JDBC-4.0, the JDBC specification had a bug related to what could be given as a "column name" to ResultSet methods like findColumn(), or getters that took a String property. JDBC-4.0 clarified "column name" to mean the label, as given in an "AS" clause and returned by ResultSetMetaData.getColumnLabel(), and if no AS clause, the column name. Setting this property to "true" will give behavior that is congruent to JDBC-3.0 and earlier versions of the JDBC specification, but which because of the specification bug could give unexpected results. This property is preferred over "useOldAliasMetadataBehavior" unless you need the specific behavior that it provides with respect to ResultSetMetadata. Default: false Since version: 5.1.7
pedantic Follow the JDBC spec to the letter. Default: false Since version: 3.0.0
useOldAliasMetadataBehavior Should the driver use the legacy behavior for "AS" clauses on columns and tables, and only return aliases (if any) for ResultSetMetaData.getColumnName() or ResultSetMetaData.getTableName() rather than the original column/table name? In 5.0.x, the default value was true. Default: false Since version: 5.0.4

X Protocol and X DevAPI. 

Properties and Descriptions
xdevapi.asyncResponseTimeout Timeout (in seconds) for getting server response via X Protocol. Default: 300 Since version: 8.0.7
xdevapi.auth Authentication mechanism to use with the X Protocol. Allowed values are "SHA256_MEMORY", "MYSQL41", "PLAIN", and "EXTERNAL". Value is case insensitive. If the property is not set, the mechanism is chosen depending on the connection type: "PLAIN" is used for TLS connections and "SHA256_MEMORY" or "MYSQL41" is used for unencrypted connections. Default: PLAIN Since version: 8.0.8
xdevapi.ssl-mode By default the network connections in X DevAPI sessions are SSL encrypted. This property permits to turn secure connections off or to choose different levels of security. The following values are allowed: DISABLED - Establish unencrypted connections; REQUIRED - (default) Establish secure connections if the server supports them, fails otherwise; VERIFY_CA - Like REQUIRED but additionally verify the server TLS certificate against the configured Certificate Authority (CA) certificates; VERIFY_IDENTITY - Like VERIFY_CA, but additionally verify that the server certificate matches the host to which the connection is attempted. Default: REQUIRED Since version: 8.0.7
xdevapi.ssl-truststore URL to the trusted CA certificates key store (if not specified, use defaults) Since version: 6.0.6
xdevapi.ssl-truststore-password Password for the trusted CA certificates key store Since version: 6.0.6
xdevapi.ssl-truststore-type Type of the trusted CA certificates key store (NULL or empty means use the default, which is "JKS") Default: JKS Since version: 6.0.6
xdevapi.useAsyncProtocol Use asynchronous variant of X Protocol Default: true Since version: 6.0.0

Properties for named pipe connections

Connector/J also supports access to MySQL using named pipes on Windows platforms with the NamedPipeSocketFactory as a plugin-sockets factory. If you do not use a namedPipePath property, the default of '\\.\pipe\MySQL' is used. If you use the NamedPipeSocketFactory, the host name and port number values in the JDBC URL are ignored. To enable this feature, set the socketFactory property:

socketFactory=com.mysql.cj.protocol.NamedPipeSocketFactory

Set this property, as well as the path of the named pipe, with the following connection URL:

jdbc:mysql:///test?socketFactory=com.mysql.cj.protocol.NamedPipeSocketFactory&namedPipePath=\\.\pipe\MySQL80

To create your own socket factories, follow the sample code in com.mysql.cj.protocol.NamedPipeSocketFactory or com.mysql.cj.protocol.StandardSocketFactory.

An alternate approach is to use the following two properties in connection URLs for establishing named pipe connections on Windows platforms:

• (protocol=pipe) for named pipes (default value for the property is tcp).

• (path=path_to_pipe) for path of named pipes. Default value for the path is \\.\pipe\MySQL.

The “address-equals” or “key-value” form of host specification (see Single host for details) greatly simplifies the URL for a named pipe connection on Windows. For example, to use the default named pipe of “\\.\pipe\MySQL,” just specify:

jdbc:mysql://address=(protocol=pipe)/test

To use the custom named pipe of “\\.\pipe\MySQL80” :

jdbc:mysql://address=(protocol=pipe)(path=\\.\pipe\MySQL80)/test

With (protocol=pipe), the NamedPipeSocketFactory is automatically selected.

Named pipes only work when connecting to a MySQL server on the same physical machine where the JDBC driver is running. In simple performance tests, named pipe access is between 30%-50% faster than the standard TCP/IP access. However, this varies per system, and named pipes are slower than TCP/IP in many Windows configurations.