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https://dev.mysql.com/doc/refman/8.0/en/clone-plugin-concurrent-ddl.html
The clone_ddl_timeout variable defines the time in seconds on the donor and recipient that a cloning operation waits for a backup lock. Prior to MySQL 8.0.27, DDL operations on the donor and recipient MySQL Server instances, including TRUNCATE ...
https://dev.mysql.com/doc/refman/8.0/en/validate-password-installation.html
This section describes how to install and uninstall the validate_password password-validation component. Note If you install MySQL 8.0 using the MySQL Yum repository, MySQL SLES Repository, or RPM packages provided by Oracle, the validate_password ...For general information about installing and uninstalling components, see Section 7.5, “MySQL ...To be usable by the server, the component library file ...
https://dev.mysql.com/doc/refman/8.0/en/events-metadata.html
This becomes the event time zone (ETZ); that is, the time zone that is used for event scheduling and is in effect within the event as it executes. For representation of event information in the data dictionary, the execute_at, starts, and ends times ...Event Scheduler Time Representation Each session in MySQL has a session time zone ... To ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-metrics-table.html
(The _RESET columns act like the lap counter on a stopwatch: you can measure the activity during some time interval, while the cumulative figures are still available in COUNT, MAX_COUNT, and so on.) MAX_COUNT_RESET The maximum counter value since it ...With more detailed queries, you can diagnose issues such as performance bottlenecks, resource shortages, and application ... The INNODB_METRICS table provides a ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-online-ddl-space-requirements.html
If the operation takes a long time and concurrent DML modifies the table so much that the size of the temporary log file exceeds the value of innodb_online_alter_log_max_size, the online DDL operation fails with a DB_ONLINE_LOG_TOO_BIG error, and ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-programs-ndb-error-reporter.html
The archive is named ndb_error_report_YYYYMMDDhhmmss.tar.bz2, where YYYYMMDDhhmmss is a datetime string. ndb_error_reporter also accepts the options listed here: --connection-timeout=timeout Command-Line Format --connection-timeout=# Type Integer ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-mutex-instances-table.html
The work performed while holding a mutex is said to be in a “critical section,” and multiple queries do execute this critical section in a serialized way (one at a time), which is a potential bottleneck. When a thread succeeds in locking a ...A ... The mutex_instances table lists all the mutexes seen by the Performance Schema while the server ...
https://dev.mysql.com/doc/refman/8.0/en/x-plugin-system-monitoring.html
Issue: mysql-py> \sql SELECT NAME, ENABLED, TIMED FROM performance_schema.setup_instruments WHERE NAME LIKE 'statement/%' AND NOT (ENABLED and TIMED) If this statement reports at least one row, you need to enable the instruments. When you execute a ... For general X Plugin monitoring, use the status variables that it ...
https://dev.mysql.com/doc/refman/8.0/en/myisam-table-maintenance.html
With myisamchk, you must make sure that the server does not use the tables at the same time so that there is no unwanted interaction between myisamchk and the server. This section discusses how to use myisamchk to check or repair MyISAM tables ...
https://dev.mysql.com/doc/refman/8.0/en/savepoint.html
SAVEPOINT identifier ROLLBACK [WORK] TO [SAVEPOINT] identifier RELEASE SAVEPOINT identifier InnoDB supports the SQL statements SAVEPOINT, ROLLBACK TO SAVEPOINT, RELEASE SAVEPOINT and the optional WORK keyword for ROLLBACK. If the current ...The ...