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https://dev.mysql.com/doc/refman/5.7/en/multiple-key-caches.html
Shared access to the key cache improves performance but does not eliminate contention among sessions entirely. They still compete for control structures that manage access to the key cache buffers. To reduce key cache access contention further, ...
https://dev.mysql.com/doc/refman/5.7/en/myisamchk-table-info.html
To obtain a description of a MyISAM table or statistics about it, use the commands shown here. The output from these commands is explained later in this section. myisamchk -d tbl_name Runs myisamchk in “describe mode” to produce a description ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-backup-using-management-client.html
Before starting a backup, make sure that the cluster is properly configured for performing one. If an existing backup_id value is used, the backup fails with the error Backup failed: file already exists. If used, the backup_id must follow START ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-replication-starting.html
This section outlines the procedure for starting NDB Cluster replication using a single replication channel. Start the MySQL replication source server by issuing this command, where id is this server's unique ID (see Section 21.7.2, “General ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-logging.html
The mysql client can do these types of logging for statements executed interactively: On Unix, mysql writes the statements to a history file. By default, this file is named .mysql_history in your home directory. To specify a different file, set the ...
https://dev.mysql.com/doc/refman/5.7/en/partitioning-columns-list.html
This is a variant of LIST partitioning that enables the use of multiple columns as partition keys, and for columns of data types other than integer types to be used as partitioning columns; you can use string types, DATE, and DATETIME columns. In ...
https://dev.mysql.com/doc/refman/5.7/en/password-security-user.html
MySQL users should use the following guidelines to keep passwords secure. When you run a client program to connect to the MySQL server, it is inadvisable to specify your password in a way that exposes it to discovery by other users. The methods you ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-prepared-statements-instances-table.html
The Performance Schema provides instrumentation for prepared statements, for which there are two protocols: The binary protocol. This is accessed through the MySQL C API and maps onto underlying server commands as shown in the following table. C ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-rwlock-instances-table.html
The rwlock_instances table lists all the rwlock (read write lock) instances seen by the Performance Schema while the server executes. An rwlock is a synchronization mechanism used in the code to enforce that threads at a given time can have access ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-table-handles-table.html
The Performance Schema exposes table lock information through the table_handles table to show the table locks currently in effect for each opened table handle. This information shows which table handles the server has open, how they are locked, and ...