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https://dev.mysql.com/doc/refman/5.7/en/index-statistics.html
For a join based on the <=> comparison operator, NULL is not treated differently from any other value: NULL <=> NULL, just as N <=> N for any other N. However, for a join based on the = operator, NULL is different from non-NULL values: expr1 = expr2 ... Storage engines collect statistics about tables for use by the ...
https://dev.mysql.com/doc/refman/5.7/en/data-masking-functions.html
Return value: The masked string, or NULL if either margin is negative. Return value: The masked string, or NULL if either margin is negative. Return value: The masked Social Security number as a string, or NULL if the argument is not the correct ...
https://dev.mysql.com/doc/refman/5.7/en/replication-gtids-lifecycle.html
In addition, for a non-transactional update, if a disk write failure occurs while attempting to write to the binary log cache and a gap is therefore created in the binary log, the resulting incident log event is assigned a GTID. When you issue RESET ... The life cycle of a GTID consists of the following steps: A transaction is executed and committed on the replication source ...
https://dev.mysql.com/doc/refman/5.7/en/replication-threads-monitor-worker.html
On a multithreaded replica, the Performance Schema tables replication_applier_status_by_coordinator and replication_applier_status_by_worker show status information for the replica's coordinator thread and applier worker threads respectively. For a ...
https://dev.mysql.com/doc/refman/5.7/en/xa-restrictions.html
XA transaction support is limited to the InnoDB storage engine. For “external XA,” a MySQL server acts as a Resource Manager and client programs act as Transaction Managers. For “Internal XA”, storage engines within a MySQL server act as ...
https://dev.mysql.com/doc/refman/5.7/en/pluggable-authentication-system-variables.html
authentication_ldap_sasl_bind_base_dn Command-Line Format --authentication-ldap-sasl-bind-base-dn=value Introduced 5.7.19 System Variable authentication_ldap_sasl_bind_base_dn Scope Global Dynamic Yes Type String Default Value NULL For SASL LDAP ...
https://dev.mysql.com/doc/refman/5.7/en/version-tokens-reference.html
| +------------------------------------+ An argument of NULL is treated as an empty string, which has no effect on the token list. (It is not an error to delete nonexisting tokens.) To clear the token list entirely without knowing which tokens are ...version_tokens_delete(name_list) Deletes tokens from the server's list of version tokens using the name_list argument and returns a binary string that indicates the outcome of the ... The following discussion serves as a ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-ndb-transid-mysql-connection-map-table.html
The ndb_transid_mysql_connection_map table provides a mapping between NDB transactions, NDB transaction coordinators, and MySQL Servers attached to an NDB Cluster as API nodes. This information is used when populating the server_operations and ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-information-schema-examples.html
Identifying Blocking Transactions It is sometimes helpful to identify which transaction blocks another. The tables that contain information about InnoDB transactions and data locks enable you to determine which transaction is waiting for another, ...
https://dev.mysql.com/doc/refman/5.7/en/json-creation-functions.html
mysql> SELECT JSON_ARRAY(1, "abc", NULL, TRUE, CURTIME()); +---------------------------------------------+ | JSON_ARRAY(1, "abc", NULL, TRUE, CURTIME()) | +---------------------------------------------+ | [1, "abc", null, true, "11:30:24.000000"] | ... The functions listed in this section compose JSON values from component ...