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https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema-fulltext_index-tables.html
INNODB_FT_BEING_DELETED: Provides a snapshot of the INNODB_FT_DELETED table; it is used only during an OPTIMIZE TABLE maintenance operation. When OPTIMIZE TABLE is run, the INNODB_FT_BEING_DELETED table is emptied, and DOC_ID values are removed from ...INNODB_FT_INDEX_CACHE: Provides token information about newly inserted rows in a FULLTEXT ...
https://dev.mysql.com/doc/refman/8.0/en/upgrading-from-previous-series.html
A partitioned table using any other storage engine must be altered—either to convert it to InnoDB or NDB, or to remove its partitioning—before upgrading the server, else it cannot be used afterwards. Note The procedure given at Section 3.6, ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-row-format.html
To store DYNAMIC tables in the system tablespace, either disable innodb_file_per_table and use a regular CREATE TABLE or ALTER TABLE statement, or use the TABLESPACE [=] innodb_system table option with CREATE TABLE or ALTER TABLE. The row format of ... The row format of a table determines how its rows are physically stored, which in turn can affect the performance of queries and DML ...As more rows fit into a single disk page, ...
https://dev.mysql.com/doc/refman/8.0/en/rebuilding-tables.html
Methods for rebuilding a table include: Dump and Reload Method ALTER TABLE Method REPAIR TABLE Method Dump and Reload Method If you are rebuilding tables because a different version of MySQL cannot handle them after a binary (in-place) upgrade or ...
https://dev.mysql.com/doc/refman/8.0/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/8.0/en/information-schema-innodb-tables-table.html
Tables assigned to the system tablespace using CREATE TABLE or ALTER TABLE TABLESPACE=innodb_system have a SPACE_TYPE of General. INSTANT_COLS The number of columns that existed before the first instant column was added using ALTER TABLE ... When a ...For related usage information and examples, see Section 17.15.3, “InnoDB INFORMATION_SCHEMA Schema Object ...The ...
https://dev.mysql.com/doc/refman/8.0/en/create-tablespace.html
TABLESPACE [=] tablespace_name or ALTER TABLE tbl_name TABLESPACE [=] tablespace_name to add tables to the tablespace. Additional data files may be added to the tablespace by using the ALTER TABLESPACE statement (see Section 15.1.10, “ALTER ...The ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-files-table.html
For NDB: The name of an undo log file created by CREATE LOGFILE GROUP or ALTER LOGFILE GROUP, or of a data file created by CREATE TABLESPACE or ALTER TABLESPACE. This means, for example, that the name of a data file created with ALTER TABLESPACE ts ... The FILES table provides information about the files in which MySQL tablespace data is ...For additional information specific to InnoDB, see InnoDB ...
https://dev.mysql.com/doc/refman/8.0/en/derived-tables.html
Alternatively, tbl_name may be followed by a parenthesized list of names for the derived table columns: SELECT ... For information about lateral derived tables preceded by the LATERAL keyword, see Section 15.2.15.9, “Lateral Derived Tables”. A ...This does not work: SELECT AVG(SUM(column1)) FROM t1 GROUP BY column1; However, this query provides the desired information: SELECT AVG(sum_column1) FROM (SELECT SUM(column1) AS sum_column1 FROM t1 GROUP BY column1) AS t1; Notice that the column name used within the subquery (sum_column1) is recognized in the outer ...
https://dev.mysql.com/doc/refman/8.0/en/log-destinations.html
CREATE TABLE, ALTER TABLE, and DROP TABLE are valid operations on a log table. For ALTER TABLE and DROP TABLE, the log table cannot be in use and must be disabled, as described later. The log tables can be altered to use the MyISAM storage engine.