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https://dev.mysql.com/doc/refman/5.7/en/identifier-length.html
The following table describes the maximum length for each type of identifier. For constraint definitions that include no constraint name, the server internally generates a name derived from the associated table name. For example, internally ...You ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-change-buffer.html
On disk, the change buffer is part of the system tablespace, where index changes are buffered when the database server is shut down. Configuring Change Buffering When INSERT, UPDATE, and DELETE operations are performed on a table, the values of ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-online-ddl.html
The online DDL feature provides support for in-place table alterations and concurrent DML. Benefits of this feature include: Improved responsiveness and availability in busy production environments, where making a table unavailable for minutes or ...The ability to adjust the balance between performance and concurrency during DDL operations using the LOCK ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-standard-monitor.html
The contents include the statement that failed as well as information about the constraint that failed and the referenced and referencing tables. The Lock Monitor is the same as the Standard Monitor except that it includes additional lock ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-programs-ndb-move-data.html
Usage The program is invoked with the names of the source and target tables; either or both of these may be qualified optionally with the database name. ndb_move_data options source target Options that can be used with ndb_move_data are shown in the ...--character-sets-dir=name Command-Line Format --character-sets-dir=path Type String Default Value [none] Directory where character sets ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-programs-ndb-size-pl.html
Options that can be used with ndb_size.pl are shown in the following table. Similarly, you can cause specific tables to be skipped by listing their names, separated by commas, following the optional --excludetables option. Memory requirements for ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-indexes.html
Without an index, MySQL must begin with the first row and then read through the entire table to find the relevant rows. If the table has an index for the columns in question, MySQL can quickly determine the position to seek to in the middle of the ... Indexes are used to find rows with specific column values ...
https://dev.mysql.com/doc/refman/5.7/en/replication-features-flush.html
Some forms of the FLUSH statement are not logged because they could cause problems if replicated to a replica: FLUSH LOGS and FLUSH TABLES WITH READ LOCK. The FLUSH TABLES, ANALYZE TABLE, OPTIMIZE TABLE, and REPAIR TABLE statements are written to ...These statements are written to the binary log unless you specify NO_WRITE_TO_BINLOG or its alias ...
https://dev.mysql.com/doc/refman/5.7/en/silent-column-changes.html
In some cases, MySQL silently changes column specifications from those given in a CREATE TABLE or ALTER TABLE statement. See Section 8.4.7, “Limits on Table Column Count and Row Size”. Trailing spaces are automatically deleted from ENUM and SET ...These might be changes to a data type, to attributes associated with a data type, or to an index ...
https://dev.mysql.com/doc/refman/5.7/en/stored-programs-logging.html
If a stored program that modifies data is nondeterministic, it is not repeatable. Triggers can update tables, so error messages similar to those for stored functions occur with CREATE TRIGGER if you do not have the required privileges. If a function ... The binary log contains information about SQL statements that modify database ...