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https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-buffer-pool-stats-table.html
The INNODB_BUFFER_POOL_STATS table provides much of the same buffer pool information provided in SHOW ENGINE INNODB STATUS output. Much of the same information may also be obtained using InnoDB buffer pool server status variables. For related usage ...The idea of making pages in the buffer pool “young” or “not young” refers to transferring them between the sublists at the head and tail of the buffer pool data ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-cmp-per-index-table.html
The INNODB_CMP_PER_INDEX and INNODB_CMP_PER_INDEX_RESET tables provide status information on operations related to compressed InnoDB tables and indexes, with separate statistics for each combination of database, table, and index, to help you ...In ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-ft-config-table.html
The INNODB_FT_CONFIG table provides metadata about the FULLTEXT index and associated processing for an InnoDB table. Before querying it, set the value of the innodb_ft_aux_table system variable to the name (including the database name) of the table ...The key names and their meanings include: optimize_checkpoint_limit: The number of seconds after which an OPTIMIZE TABLE run ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-sys-virtual-table.html
The INNODB_SYS_VIRTUAL table provides metadata about InnoDB virtual generated columns and columns upon which virtual generated columns are based, equivalent to information in the SYS_VIRTUAL table in the InnoDB data dictionary. A row appears in the ...The value is large because it encodes the column sequence number and ordinal ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-temp-table-info-table.html
The INNODB_TEMP_TABLE_INFO table provides information about user-created InnoDB temporary tables that are active in an InnoDB instance. It does not provide information about internal InnoDB temporary tables used by the optimizer. The ...SPACE The ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-buffer-pool-flushing.html
InnoDB performs certain tasks in the background, including flushing of dirty pages from the buffer pool. The number of page cleaner threads is controlled by the innodb_page_cleaners variable, which has a default value of 4. However, if the number ...Dirty pages are those that have been modified but are not yet written to the data files on ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-deadlock-detection.html
When deadlock detection is enabled (the default), InnoDB automatically detects transaction deadlocks and rolls back a transaction or transactions to break the deadlock. InnoDB tries to pick small transactions to roll back, where the size of a ...A ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-purge-configuration.html
InnoDB does not physically remove a row from the database immediately when you delete it with an SQL statement. A row and its index records are only physically removed when InnoDB discards the undo log record written for the deletion. It parses and ...This removal operation, which only occurs after the row is no longer required for multi-version concurrency control (MVCC) or rollback, is called a ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-ft-default-stopword-table.html
The INNODB_FT_DEFAULT_STOPWORD table holds a list of stopwords that are used by default when creating a FULLTEXT index on InnoDB tables. For information about the default InnoDB stopword list and how to define your own stopword lists, see Section ...Use the INFORMATION_SCHEMA COLUMNS table or the SHOW COLUMNS statement to view additional information about the columns of this table, including data types and default ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-ft-index-table-table.html
The INNODB_FT_INDEX_TABLE table provides information about the inverted index used to process text searches against the FULLTEXT index of an InnoDB table. Before querying it, set the value of the innodb_ft_aux_table system variable to the name ...