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https://dev.mysql.com/doc/refman/8.0/en/sys-user-summary-by-file-io.html
io_latency The total wait time of timed file I/O events for the user. By default, rows are sorted by descending total file I/O latency. The user_summary_by_file_io and x$user_summary_by_file_io views have these columns: user The client user name.
https://dev.mysql.com/doc/refman/8.0/en/alter-resource-group.html
The name and type attributes are set at group creation time and cannot be modified thereafter with ALTER RESOURCE GROUP. ALTER RESOURCE GROUP group_name [VCPU [=] vcpu_spec [, vcpu_spec] ...] [THREAD_PRIORITY [=] N] [ENABLE|DISABLE [FORCE]] ...
https://dev.mysql.com/doc/refman/8.0/en/connection-control-plugin-variables.html
Connection Control Plugin Status Variables If the CONNECTION_CONTROL plugin is installed, it exposes this status variable: Connection_control_delay_generated The number of times the server added a delay to its response to a failed connection attempt. Assigning a value to connection_control_failed_connections_threshold at runtime resets Connection_control_delay_generated to ... This section describes ...
https://dev.mysql.com/doc/refman/8.0/en/custom-benchmarks.html
Most of the time, these problems would be much easier to fix if the systems were not already in production. To avoid problems like this, benchmark your whole application under the worst possible load: The mysqlslap program can be helpful for ...
https://dev.mysql.com/doc/refman/8.0/en/ddl-rewriter-options.html
If values specified at startup time are incorrect, the ddl_rewriter plugin may fail to initialize properly and the server does not load it. This section describes the command options that control operation of the ddl_rewriter plugin. To control ...
https://dev.mysql.com/doc/refman/8.0/en/delete-optimization.html
The time required to delete individual rows in a MyISAM table is exactly proportional to the number of indexes. To delete rows more quickly, you can increase the size of the key cache by increasing the key_buffer_size system variable. To delete all ...
https://dev.mysql.com/doc/refman/8.0/en/error-log-destination-configuration.html
Default Error Log Destination on Unix and Unix-Like Systems On Unix and Unix-like systems, mysqld uses the --log-error option to determine whether the default error log destination is the console or a file, and, if a file, the file name: If ... This ...
https://dev.mysql.com/doc/refman/8.0/en/error-log-event-fields.html
Core Error Event Fields Optional Error Event Fields Core Error Event Fields These error event fields are core fields: time The event timestamp, with microsecond precision. thread The ID of the thread within mysqld responsible for producing the error ... Error events intended for the error log contain a set of fields, each of which consists of a key/value ...
https://dev.mysql.com/doc/refman/8.0/en/execute.html
You can execute a given prepared statement multiple times, passing different variables to it or setting the variables to different values before each execution. EXECUTE stmt_name [USING @var_name [, @var_name] ...] After preparing a statement with ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-group-write-consensus.html
This section explains how to inspect and configure the maximum number of consensus instances at any time for a group. This maximum is referred to as the event horizon for a group, and is the maximum number of consensus instances that the group can ...