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https://dev.mysql.com/doc/refman/8.0/en/performance-schema-wait-tables.html
These tables store wait events: events_waits_current: The current wait event for each thread. There are also summary tables that aggregate information about wait events; see Section 29.12.20.1, “Wait Event Summary Tables”. For more information ... The Performance Schema instruments waits, which are events that take ...
https://dev.mysql.com/doc/refman/8.0/en/repair-table-optimization.html
REPAIR TABLE for MyISAM tables is similar to using myisamchk for repair operations, and some of the same performance optimizations apply: myisamchk has variables that control memory allocation. For REPAIR TABLE, the same principle applies, but ...
https://dev.mysql.com/doc/refman/8.0/en/thread-pool-information-schema-tables.html
Note As of MySQL 8.0.14, the INFORMATION_SCHEMA thread pool tables are also available as Performance Schema tables. (See Section 29.12.16, “Performance Schema Thread Pool Tables”.) The INFORMATION_SCHEMA tables are deprecated; expect them be ...
https://dev.mysql.com/doc/refman/8.0/en/data-dictionary-usage-differences.html
Use of a data dictionary-enabled MySQL server entails some operational differences compared to a server that does not have a data dictionary: Previously, enabling the innodb_read_only system variable prevented creating and dropping tables only for ...The same principle applies to other table operations that require modifying data dictionary ...
https://dev.mysql.com/doc/refman/8.0/en/firewall-reference.html
For information about MySQL Enterprise Firewall Information Schema and Performance Schema tables, see Section 28.7, “INFORMATION_SCHEMA MySQL Enterprise Firewall Tables”, and Section 29.12.17, “Performance Schema Firewall Tables”, ...When ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-user-defined-functions-table.html
The user_defined_functions table contains a row for each loadable function registered automatically by a component or plugin, or manually by a CREATE FUNCTION statement. The mysql.func system table also lists installed loadable functions, but only ...For information about operations that add or remove table rows, see Section 7.7.1, “Installing and Uninstalling Loadable ...
https://dev.mysql.com/doc/refman/8.0/en/added-deprecated-removed.html
innodb_tmpdir: Directory location for temporary table files created during online ALTER TABLE operations. print_identified_with_as_hex: For SHOW CREATE USER, print hash values containing unprintable characters in hex. Replica_open_temp_tables: ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-session-temp-tablespaces-table.html
The INNODB_SESSION_TEMP_TABLESPACES table provides metadata about session temporary tablespaces used for internal and user-created temporary tables. Session temporary tablespaces are recreated each time the server is started. SLAVE indicates that ...The INNODB_SESSION_TEMP_TABLESPACES table has these columns: ID The process or session ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-tablespaces-brief-table.html
If a file-per-table tablespace is created in a location outside the MySQL data directory, the path value is a fully qualified directory path. The INNODB_TABLESPACES_BRIEF table provides space ID, name, path, flag, and space type metadata for ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndbinfo-table-info.html
The table_info table provides information about logging, checkpointing, distribution, and storage options in effect for individual NDB tables.