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https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-cmpmem-table.html
The INNODB_CMPMEM and INNODB_CMPMEM_RESET tables provide status information on compressed pages within the InnoDB buffer pool. The INNODB_CMPMEM and INNODB_CMPMEM_RESET tables have these columns: PAGE_SIZE The block size in bytes. row ...PAGES_USED ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-error-summary-tables.html
The Performance Schema maintains summary tables for aggregating statistical information about server errors (and warnings). Each error summary table has three columns that identify the error: ERROR_NUMBER is the numeric error value. For example, if ...For a list of server errors, see Server Error Message ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-events-stages-current-table.html
The table stores one row per thread showing the current status of the thread's most recent monitored stage event, so there is no system variable for configuring the table size. Of the tables that contain stage event rows, events_stages_current is ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-statement-tables.html
These tables store statement events: events_statements_current: The current statement event for each thread. prepared_statements_instances: Prepared statement instances and statistics The following sections describe the statement event tables. There ...Statement events occur at a high level of the event ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-tablespaces-table.html
SERVER_VERSION The MySQL version that created the tablespace, or the MySQL version into which the tablespace was imported, or the version of the last major MySQL version upgrade. The value can be considered a “creation” marker or “certified” ... The INNODB_TABLESPACES table provides metadata about InnoDB file-per-table, general, and undo ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-ndb-sync-excluded-objects-table.html
This table provides information about NDB database objects which cannot be automatically synchronized between NDB Cluster's dictionary and the MySQL data dictionary. row *************************** SCHEMA_NAME: NULL NAME: ts1 TYPE: TABLESPACE ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning-handling-nulls.html
We can verify this behavior by examining the effects on the file system of creating a table partitioned by HASH and populating it with a record containing appropriate values. If you insert a row into a table partitioned by RANGE such that the column ... Partitioning in MySQL does nothing to disallow NULL as the value of a partitioning expression, whether it is a column value or the value of a user-supplied ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-statement-histogram-summary-tables.html
The Performance Schema maintains statement event summary tables that contain information about minimum, maximum, and average statement latency (see Section 29.12.20.3, “Statement Summary Tables”). Section 29.12.6, “Performance Schema ...To ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-status-variable-summary-tables.html
The Performance Schema makes status variable information available in the tables described in Section 29.12.15, “Performance Schema Status Variable Tables”. It also makes aggregated status variable information available in summary tables, ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-triggers-table.html
To see information about a table's triggers, you must have the TRIGGER privilege for the table. The TRIGGERS table has these columns: TRIGGER_CATALOG The name of the catalog to which the trigger belongs. This is the type of operation on the ...