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https://dev.mysql.com/doc/refman/8.4/en/innodb-undo-tablespaces.html
For counter names and descriptions, query the Information Schema INNODB_METRICS table. SELECT NAME, SUBSYSTEM, COMMENT FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE NAME LIKE '%truncate%'; For information about enabling counters and querying counter ... Undo tablespaces contain undo logs, which are collections of records containing information about how to undo the latest change by a transaction to a clustered index ...
https://dev.mysql.com/doc/mysqld-version-reference/en/information-schema-tables.html
The following table shows all INFORMATION_SCHEMA tables available in MySQL Server. Introduced: The version or versions in which the item was introduced. Deprecated: The version or versions in which the item was deprecated. Removed: The version or ...
https://dev.mysql.com/doc/refman/8.4/en/information-schema-innodb-table-reference.html
The following table summarizes INFORMATION_SCHEMA InnoDB tables. For greater detail, see the individual table descriptions. Table 28.3 INFORMATION_SCHEMA InnoDB Tables Table Name Description INNODB_BUFFER_PAGE Pages in InnoDB buffer pool ...
https://dev.mysql.com/doc/refman/8.4/en/information-schema-table-reference.html
The following table summarizes all available INFORMATION_SCHEMA tables. For greater detail, see the individual table descriptions. Table 28.1 INFORMATION_SCHEMA Tables Table Name Description Deprecated ADMINISTRABLE_ROLE_AUTHORIZATIONS Grantable ...
https://dev.mysql.com/doc/refman/8.4/en/innodb-deadlock-example.html
The Information Schema contains the number of deadlocks: mysql> SELECT `count` FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE NAME="lock_deadlocks"; +-------+ | count | +-------+ | 1 | +-------+ 1 row in set (0.00 sec) The InnoDB status contains the ... The following example illustrates how an error can occur when a lock request causes a ...
https://dev.mysql.com/doc/refman/8.4/en/mysql-cluster-ndbinfo.html
ndbinfo is a database containing information specific to NDB Cluster. This database contains a number of tables, each providing a different sort of data about NDB Cluster node status, resource usage, and operations. You can find more detailed ...