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https://dev.mysql.com/doc/refman/8.0/en/sys-wait-classes-global-by-avg-latency.html
The wait_classes_global_by_avg_latency and x$wait_classes_global_by_avg_latency views have these columns: event_class The event class. total_latency The total wait time of timed occurrences of events in the class. min_latency The minimum single wait ... These views summarize wait class average latencies, grouped by event ...
https://dev.mysql.com/doc/refman/8.0/en/sys-wait-classes-global-by-latency.html
The wait_classes_global_by_latency and x$wait_classes_global_by_latency views have these columns: event_class The event class. total_latency The total wait time of timed occurrences of events in the class. min_latency The minimum single wait time of ... These views summarize wait class total latencies, grouped by event ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema-examples-compression-sect.html
Compressing or uncompressing pages has consumed less than a second since the time the statistics were reset, because the columns COMPRESS_TIME and UNCOMPRESS_TIME are zero. Example 17.1 Using the Compression Information Schema Tables The following ...The following table shows the contents of INFORMATION_SCHEMA.INNODB_CMP under a light ...
https://dev.mysql.com/doc/refman/8.0/en/creating-database.html
(Under Windows, this restriction does not apply, although you must refer to databases and tables using the same lettercase throughout a given query. Discuss this with the administrator or see Section 8.2, “Access Control and Account Management”.
https://dev.mysql.com/doc/refman/8.0/en/sys-host-summary-by-file-io.html
The host_summary_by_file_io and x$host_summary_by_file_io views have these columns: host The host from which the client connected. Rows for which the HOST column in the underlying Performance Schema table is NULL are assumed to be for background ...
https://dev.mysql.com/doc/refman/8.0/en/sys-user-summary-by-file-io.html
The user_summary_by_file_io and x$user_summary_by_file_io views have these columns: user The client user name. Rows for which the USER column in the underlying Performance Schema table is NULL are assumed to be for background threads and are ...By ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-thread-pool-tables.html
In the case of tp_thread_state, all rows for a thread group comprise a snapshot in time. But it does not hold mutexes on all thread groups at the same time, to prevent a statement against tp_thread_state from blocking the entire MySQL server. The ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-backup-recovery.html
For information about point-in-time recovery, recovery from disk failure or corruption, and how InnoDB performs crash recovery, see Section 17.18.2, “InnoDB Recovery”. This section covers topics related to InnoDB backup and recovery. For ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-restrictions-limitations.html
This section describes restrictions and limitations of the InnoDB storage engine. You cannot create a table with a column name that matches the name of an internal InnoDB column (including DB_ROW_ID, DB_TRX_ID, and DB_ROLL_PTR. InnoDB does not keep ...This restriction applies to use of the names in any ...
https://dev.mysql.com/doc/refman/8.0/en/x-plugin-options-variables.html
If configuration values specified at startup time are incorrect, X Plugin could fail to initialize properly and the server does not load it. This section describes the command options and system variables that configure X Plugin, as well as the ...