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https://dev.mysql.com/doc/refman/8.0/en/error-log-configuration.html
INSTALL COMPONENT adds the component to the mysql.component table (an InnoDB table), and the components to load at startup are read from this table, which is only accessible after InnoDB is initialized. Note Loading a log component implicitly using ... In MySQL 8.0, error logging uses the MySQL component architecture described at Section 7.5, “MySQL ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-filtering.html
The setup_instruments table lists the instruments for which events can be collected, whether they are enabled, and (for enabled instruments) whether to collect timing information: mysql> SELECT NAME, ENABLED, TIMED FROM ... Events are processed in a ...
https://dev.mysql.com/doc/refman/8.0/en/reset-replica.html
The statement does not change the values of gtid_executed or gtid_purged, or the mysql.gtid_executed table. Issuing a RESET REPLICA ALL statement without a FOR CHANNEL channel clause when multiple replication channels exist deletes all replication ... RESET REPLICA [ALL] [channel_option] channel_option: FOR CHANNEL channel RESET REPLICA makes the replica forget its position in the source's binary ...
https://dev.mysql.com/doc/refman/8.0/en/subquery-materialization.html
Materialization speeds up query execution by generating a subquery result as a temporary table, normally in memory. The first time MySQL needs the subquery result, it materializes that result into a temporary table. Any subsequent time the result is ... The optimizer uses materialization to enable more efficient subquery ...
https://dev.mysql.com/doc/refman/8.0/en/sys-metrics.html
The metric type determines the source from which the name is taken: For global status variables: The VARIABLE_NAME column of the global_status table For InnoDB metrics: The NAME column of the INNODB_METRICS table For other metrics: A view-provided ... This view summarizes MySQL server metrics to show variable names, values, types, and whether they are ...
https://dev.mysql.com/doc/refman/8.0/en/sys-sys-get-config.html
Given a configuration option name, returns the option value from the sys_config table, or the provided default value (which may be NULL) if the option does not exist in the table. If so, the routine uses the variable value without reading the ...If ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-backup.html
MySQL Enterprise Backup can also create compressed backup files, and back up subsets of tables and databases. Logical Backups Using mysqldump In addition to physical backups, it is recommended that you regularly create logical backups by dumping ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-read-only-instance.html
The default setting is ibtmp1:12M:autoextend, which creates the ibtmp1 temporary tablespace data file in the data directory. For example: --innodb-temp-data-file-path=../../../tmp/ibtmp1:12M:autoextend As of MySQL 8.0, enabling innodb_read_only ...
https://dev.mysql.com/doc/refman/8.0/en/myisamchk-other-options.html
myisamchk supports the following options for actions other than table checks and repairs: --analyze, -a Command-Line Format --analyze Analyze the distribution of key values. This improves join performance by enabling the join optimizer to better ...
https://dev.mysql.com/doc/refman/8.0/en/point-in-time-recovery-positions.html
As an example, suppose that around 20:06:00 on March 11, 2020, an SQL statement was executed that deleted a table. You can perform a point-in-time recovery to restore the server up to its state right before the table deletion. These are some sample ... The last section, Section 9.5.1, “Point-in-Time Recovery Using Binary Log”, explains the general idea of using the binary log to perform a ...