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https://dev.mysql.com/doc/refman/8.0/en/sys-io-global-by-wait-by-latency.html
These views summarize global I/O consumers to display amount of I/O and time waiting for I/O, grouped by event. The io_global_by_wait_by_latency and x$io_global_by_wait_by_latency views have these columns: event_name The I/O event name, with the ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-buffer-pool-stats-table.html
The idea of making pages in the buffer pool “young” or “not young” refers to transferring them between the sublists at the head and tail of the buffer pool data structure. For related usage information and examples, see Section 17.15.5, ...
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/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/mysql-calendar.html
Monday Tuesday Wednesday Thursday Friday Saturday Sunday 1 2 3 4 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 There are no dates between October 4 and October 15. Any dates before the cutover are Julian, and any dates following the cutover are ...A calendar applied to dates when it was not actually in use is called ...