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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/performance-schema-status-monitoring.html
When the server cannot create a mutex instrument, these results occur: No row for the instrument is inserted into the setup_instruments table. Performance_schema_xxx_instances_lost indicates how many instances of object type xxx could not be created. If the server cannot create a given instrumented mutex instance, it increments ...Names for these variables have several forms: ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-adding-instances.html
20.2.1.6.1 Adding a Second Instance In order to add a second instance, server s2, first create the configuration file for it. If you did not have binary logging enabled when you configured the user credentials on s1, and a remote cloning operation ... At this point, the group has one member in it, server s1, which has some data in ...
https://dev.mysql.com/doc/refman/8.0/en/caching-sha2-pluggable-authentication.html
The following table shows the plugin names on the server and client sides. If caching_sha2_password is the default authentication plugin, a simpler CREATE USER syntax can be used. As a result, it is possible to create the account and set its ...
https://dev.mysql.com/doc/refman/8.0/en/copying-databases.html
In cases where you need to transfer databases between different architectures, you can use mysqldump to create a file containing SQL statements. Note If GTIDs are in use on the server where you create the dump (gtid_mode=ON), by default, mysqldump ...You can then transfer the file to the other machine and feed it as input to the mysql ...
https://dev.mysql.com/doc/refman/8.0/en/option-files.html
Many option files are plain text files, created using any text editor. It is created by the server upon execution of SET PERSIST or SET PERSIST_ONLY statements. If an option file you want to use does not exist, create it using the appropriate ...