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https://dev.mysql.com/doc/refman/8.0/en/creating-accounts.html
Note Direct modification of grant tables using statements such as INSERT, UPDATE, or DELETE is discouraged and done at your own risk. To manage MySQL accounts, use the SQL statements intended for that purpose: CREATE USER and DROP USER create and ...Account-management statements cause the server to make appropriate modifications to the underlying grant tables, which are discussed in Section 8.2.3, “Grant ...
https://dev.mysql.com/doc/refman/8.0/en/function-resolution.html
ADDDATE BIT_AND BIT_OR BIT_XOR CAST COUNT CURDATE CURTIME DATE_ADD DATE_SUB EXTRACT GROUP_CONCAT MAX MID MIN NOW POSITION SESSION_USER STD STDDEV STDDEV_POP STDDEV_SAMP SUBDATE SUBSTR SUBSTRING SUM SYSDATE SYSTEM_USER TRIM VARIANCE VAR_POP VAR_SAMP ... MySQL supports built-in (native) functions, loadable functions, and stored ...Built-In Function Name Parsing Function Name Resolution Built-In Function ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-install-example-data.html
Note The information in this section applies to NDB Cluster running on both Unix and Windows platforms. Working with database tables and data in NDB Cluster is not much different from doing so in standard MySQL. The easiest way to accomplish this ...There are two key points to keep in mind: For a table to be replicated in the cluster, it must use the NDBCLUSTER storage ...
https://dev.mysql.com/doc/refman/8.0/en/query-log.html
However, when using row-based binary logging, updates are sent as row changes rather than SQL statements, and thus these statements are never written to the query log when binlog_format is ROW. To disable or enable the general query log or change ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-events-table.html
This is displayed as a DATETIME value, and is NULL if no start date and time are defined for the event. LAST_ALTERED The date and time when the event was last modified. TIME_ZONE The event time zone, which is the time zone used for scheduling the ...
https://dev.mysql.com/doc/refman/8.0/en/internal-locking.html
Table-Level Locking MySQL uses table-level locking for MyISAM, MEMORY, and MERGE tables, permitting only one session to update those tables at a time. At times, it may be more efficient to disable deadlock detection and rely on the ...This type of ... This section discusses internal locking; that is, locking performed within the MySQL server itself to manage contention for table contents by multiple ...
https://dev.mysql.com/doc/refman/8.0/en/repair-table.html
Table Repair Considerations REPAIR TABLE upgrades a table if it contains old temporal columns in pre-5.6.4 format (TIME, DATETIME, and TIMESTAMP columns without support for fractional seconds precision) and the avoid_temporal_upgrade system variable ...See Section B.3.3.3, “What to Do If MySQL Keeps Crashing”, and Section 18.2.4, “MyISAM Table ...
https://dev.mysql.com/doc/refman/8.0/en/replication-features-triggers.html
(Bug #45677) A trigger can have triggers for different combinations of trigger event (INSERT, UPDATE, DELETE) and action time (BEFORE, AFTER), and multiple triggers are permitted. It is sufficient to switch to statement-based replication only for ...
https://dev.mysql.com/doc/refman/8.0/en/host-cache.html
If that is successful, the host name is updated with the resolved host name and the validation flag is set to true. (In this case, another DNS resolution attempt occurs the next time a client connects from this IP.) If an error occurs while ... The ...The Performance Schema host_cache table exposes the contents of the host cache so that it can be examined using SELECT ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-introduction.html
Other terms that are sometimes used for this information are data dictionary and system catalog. Performance Considerations INFORMATION_SCHEMA queries that search for information from more than one database might take a long time and impact ...They ... INFORMATION_SCHEMA provides access to database metadata, information about the MySQL server such as the name of a database or table, the data type of a column, or access ...