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https://dev.mysql.com/doc/refman/5.7/en/innodb-information-schema-tables.html
For related information and examples, see Section 14.16, “InnoDB INFORMATION_SCHEMA Tables”. INFORMATION_SCHEMA InnoDB tables can be used to monitor ongoing InnoDB activity, to detect inefficiencies before they turn into issues, or to ...As your ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-cond-instances-table.html
The cond_instances table lists all the conditions seen by the Performance Schema while the server executes. The cond_instances table has these columns: NAME The instrument name associated with the condition. A condition is a synchronization ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-replication-group-member-stats-table.html
This table shows statistical information for MySQL Group Replication members. The replication_group_member_stats table has these columns: CHANNEL_NAME Name of the Group Replication channel. This has a different value for each member in the group.
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-replication-group-members-table.html
This table shows network and status information for replication group members. The replication_group_members table has these columns: CHANNEL_NAME Name of the Group Replication channel. The network addresses shown are the addresses used to connect ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-setup-tables.html
The setup tables provide information about the current instrumentation and enable the monitoring configuration to be changed. For this reason, some columns in these tables can be changed if you have the UPDATE privilege. The use of tables rather ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-user-variable-tables.html
The Performance Schema provides a user_variables_by_thread table that exposes user-defined variables. The user_variables_by_thread table has these columns: THREAD_ID The thread identifier of the session in which the variable is defined. These are ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-schemata-table.html
A schema is a database, so the SCHEMATA table provides information about databases. The SCHEMATA table has these columns: CATALOG_NAME The name of the catalog to which the schema belongs. Caution Because a global privilege is considered a privilege ...The following statements are equivalent: SELECT SCHEMA_NAME AS `Database` FROM INFORMATION_SCHEMA.SCHEMATA [WHERE SCHEMA_NAME LIKE 'wild'] SHOW DATABASES [LIKE 'wild'] You see only those databases for which you have some kind of privilege, unless you have the global SHOW DATABASES ...
https://dev.mysql.com/doc/refman/5.7/en/optimize-multi-tables.html
Some techniques for keeping individual queries fast involve splitting data across many tables. When the number of tables runs into the thousands or even millions, the overhead of dealing with all these tables becomes a new performance consideration.
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-instance-tables.html
They provide event names and explanatory notes or status information: cond_instances: Condition synchronization object instances file_instances: File instances mutex_instances: Mutex synchronization object instances rwlock_instances: Lock ...There ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-lock-tables.html
The Performance Schema exposes lock information through these tables: metadata_locks: Metadata locks held and requested table_handles: Table locks held and requested The following sections describe these tables in more detail.