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https://dev.mysql.com/doc/refman/5.7/en/myisamchk-table-info.html
To obtain a description of a MyISAM table or statistics about it, use the commands shown here. myisamchk -d tbl_name Runs myisamchk in “describe mode” to produce a description of your table. If you start the MySQL server with external locking ...The output from these commands is explained later in this ...
https://dev.mysql.com/doc/refman/5.7/en/internal-temporary-tables.html
In some cases, the server creates internal temporary tables while processing statements. The server creates temporary tables under conditions such as these: Evaluation of UNION statements, with some exceptions described later. Evaluation of some ...
https://dev.mysql.com/doc/refman/5.7/en/analyze-table.html
ANALYZE TABLE performs a key distribution analysis and stores the distribution for the named table or tables. For MyISAM tables, this statement is equivalent to using myisamchk --analyze. ANALYZE TABLE is supported for partitioned tables, and you ...
https://dev.mysql.com/doc/refman/5.7/en/table-cache.html
When you execute a mysqladmin status command, you should see something like this: Uptime: 426 Running threads: 1 Questions: 11082 Reloads: 1 Open tables: 12 The Open tables value of 12 can be somewhat puzzling if you have fewer than 12 tables. If ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-stage-tables.html
The Performance Schema instruments stages, which are steps during the statement-execution process, such as parsing a statement, opening a table, or performing a filesort operation. Stages correspond to the thread states displayed by SHOW ...Within ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-connection-tables.html
They differ in that, for grant tables, the host part of an account can be a pattern, whereas for Performance Schema tables, the host value is always a specific nonpattern host name. Each connection table has CURRENT_CONNECTIONS and TOTAL_CONNECTIONS ... When a client connects to the MySQL server, it does so under a particular user name and from a particular ...
https://dev.mysql.com/doc/refman/5.7/en/merge-table-advantages.html
MERGE tables can help you solve the following problems: Easily manage a set of log tables. For example, you can put data from different months into separate tables, compress some of them with myisampack, and then create a MERGE table to use them as ...This is much faster and saves a lot of disk ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-summary-tables.html
Summary tables provide aggregated information for terminated events over time. The tables in this group summarize event data in different ways. Each summary table has grouping columns that determine how to group the data to be aggregated, and ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-replication-tables.html
This is similar to the information available from the SHOW SLAVE STATUS statement, but representation in table form is more accessible and has usability benefits: SHOW SLAVE STATUS output is useful for visual inspection, but not so much for ...For ...
https://dev.mysql.com/doc/refman/5.7/en/rename-table.html
RENAME TABLE tbl_name TO new_tbl_name [, tbl_name2 TO new_tbl_name2] ... You must have ALTER and DROP privileges for the original table, and CREATE and INSERT privileges for the new table. To execute RENAME TABLE, there must be no active ...InnoDB ...