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https://dev.mysql.com/doc/refman/5.7/en/help.html
Example: HELP 'status' Yields: Many help items for your request exist. HELP 'search_string' The HELP statement returns online information from the MySQL Reference Manual. Its proper operation requires that the help tables in the mysql database be ...
https://dev.mysql.com/doc/refman/5.7/en/host-cache.html
The MySQL server maintains an in-memory host cache that contains information about clients: IP address, host name, and error information. The Performance Schema host_cache table exposes the contents of the host cache so that it can be examined ...
https://dev.mysql.com/doc/refman/5.7/en/identifier-mapping.html
There is a correspondence between database and table identifiers and names in the file system. For the basic structure, MySQL represents each database as a directory in the data directory, and each table by one or more files in the appropriate ...
https://dev.mysql.com/doc/refman/5.7/en/implicit-commit.html
For example, if you use CREATE TEMPORARY TABLE and then roll back the transaction, the table remains in existence. The statements listed in this section (and any synonyms for them) implicitly end any transaction active in the current session, as if ...
https://dev.mysql.com/doc/refman/5.7/en/index-condition-pushdown-optimization.html
Index Condition Pushdown (ICP) is an optimization for the case where MySQL retrieves rows from a table using an index. Without ICP, the storage engine traverses the index to locate rows in the base table and returns them to the MySQL server which ...
https://dev.mysql.com/doc/refman/5.7/en/index-page-merge-threshold.html
If the “page-full” percentage for an index page falls below the MERGE_THRESHOLD value when a row is deleted or when a row is shortened by an UPDATE operation, InnoDB attempts to merge the index page with a neighboring index page. The default ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-files-table.html
The FILES table provides information about the files in which MySQL tablespace data is stored. In NDB Cluster, this table also provides information about the files in which NDB Cluster Disk Data tables are stored. For additional information ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-cmp-per-index-table.html
Compressed InnoDB pages are uncompressed whenever compression fails, or the first time a compressed page is accessed in the buffer pool and the uncompressed page does not exist. The INNODB_CMP_PER_INDEX and INNODB_CMP_PER_INDEX_RESET tables provide ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-cmp-table.html
B-tree pages are uncompressed whenever compression fails or at first access when the uncompressed page does not exist in the buffer pool. The INNODB_CMP and INNODB_CMP_RESET tables provide status information on operations related to compressed ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-temp-table-info-table.html
The INNODB_TEMP_TABLE_INFO table is created when first queried, exists only in memory, and is not persisted to disk. The INNODB_TEMP_TABLE_INFO table provides information about user-created InnoDB temporary tables that are active in an InnoDB ...