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https://dev.mysql.com/doc/refman/5.7/en/performance-schema-variable-table-migration.html
The INFORMATION_SCHEMA has tables that contain system and status variable information (see Section 24.3.11, “The INFORMATION_SCHEMA GLOBAL_VARIABLES and SESSION_VARIABLES Tables”, and Section 24.3.10, “The INFORMATION_SCHEMA GLOBAL_STATUS and ...Applications should run as is, with no code changes, and should see the same variable names and values as in MySQL ...
https://dev.mysql.com/doc/refman/5.7/en/replication-rules-table-options.html
The replica checks for and evaluates table options only if either of the following two conditions is true: No matching database options were found. When viewed in terms of events, the process of checking table options is the same for both row-based ...One or more database options were found, and were evaluated to arrive at an “execute” condition according to the rules described in the previous section (see Section 16.2.5.1, “Evaluation of Database-Level Replication and Binary Logging ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-install-example-data.html
To specify this, use the ENGINE=NDBCLUSTER or ENGINE=NDB option when creating the table: CREATE TABLE tbl_name (col_name column_definitions) ENGINE=NDBCLUSTER; Alternatively, for an existing table that uses a different storage engine, use ALTER ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-sys-tables-table.html
Tables assigned to the system tablespace using CREATE TABLE or ALTER TABLE TABLESPACE=innodb_system have a SPACE_TYPE of General. The INNODB_SYS_TABLES table provides metadata about InnoDB tables, equivalent to the information from the SYS_TABLES ...The number reported includes three hidden columns that are created by InnoDB (DB_ROW_ID, DB_TRX_ID, and ...
https://dev.mysql.com/doc/refman/5.7/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 is the same value that was used in the INITIAL_SIZE clause of the CREATE LOGFILE ... 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/5.7/en/myisam-repair.html
In this case, you must use ALTER TABLE to increase the MAX_ROWS and AVG_ROW_LENGTH table option values: ALTER TABLE tbl_name MAX_ROWS=xxx AVG_ROW_LENGTH=yyy; If you do not know the current table option values, use SHOW CREATE TABLE. The discussion ...On Unix, make sure that they are readable by the user that mysqld runs as (and to you, because you need to access the files you are ...
https://dev.mysql.com/doc/refman/5.7/en/semijoins.html
A semijoin is a preparation-time transformation that enables multiple execution strategies such as table pullout, duplicate weedout, first match, loose scan, and materialization. For an inner join between two tables, the join returns a row from one ...The optimizer uses semijoin strategies to improve subquery execution, as described in this ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-locks-set.html
If you have no indexes suitable for your statement and MySQL must scan the entire table to process the statement, every row of the table becomes locked, which in turn blocks all inserts by other users to the table. For example, in a UNION, scanned ... A locking read, an UPDATE, or a DELETE generally set record locks on every index record that is scanned in the processing of an SQL ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-upgrade.html
(Bug #76734, Bug #20727344) You can upgrade such tables individually in the mysql client using the ALTER TABLE ... Each time you upgrade MySQL, you should execute mysql_upgrade, which looks for incompatibilities with the upgraded MySQL server: It ...mysql_upgrade communicates directly with the MySQL server, sending it the SQL statements required to perform an ...
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 ...The number ...