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https://dev.mysql.com/doc/refman/8.0/en/system-schema.html
It contains tables that store information required by the MySQL server as it runs. A broad categorization is that the mysql schema contains data dictionary tables that store database object metadata, and system tables used for other operational ...A ...
https://dev.mysql.com/doc/refman/8.0/en/replication-options-replica.html
Only statements involving tables are affected, not statements such as CREATE DATABASE, DROP DATABASE, and ALTER DATABASE. If the table name pattern is %, it matches any table name and the option also applies to database-level statements (CREATE ...
https://dev.mysql.com/doc/refman/8.0/en/converting-tables-to-innodb.html
If an ALTER TABLE operation runs out of space, it starts a rollback, and that can take hours if it is disk-bound. Declare the PRIMARY KEY clause in the original CREATE TABLE statement, rather than adding it later through an ALTER TABLE statement.
https://dev.mysql.com/doc/refman/8.0/en/partitioning-limitations.html
Partitioning and repartitioning operations (such as ALTER TABLE with PARTITION BY ..., REORGANIZE PARTITION, or REMOVE PARTITIONING) depend on file system operations for their implementation. CREATE TABLE and ALTER TABLE statements that would result ...Tables employing user-defined partitioning do not preserve the SQL mode in effect at the time that they were ...
https://dev.mysql.com/doc/refman/8.0/en/memory-storage-engine.html
The value in effect for CREATE TABLE, or a subsequent ALTER TABLE or TRUNCATE TABLE, is the value used for the life of the table. To free up the memory used by deleted rows, use ALTER TABLE ENGINE=MEMORY to force a table rebuild. The MEMORY storage ...A typical use case for the MEMORY engine involves these characteristics: Operations involving transient, non-critical data such as session management or ...
https://dev.mysql.com/doc/refman/8.0/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/8.0/en/optimize-table.html
In this case, OPTIMIZE TABLE is just mapped to ALTER TABLE. InnoDB Details For InnoDB tables, OPTIMIZE TABLE is mapped to ALTER TABLE ... OPTIMIZE TABLE rebuilds the table using the table copy method under the following conditions: When the ...
https://dev.mysql.com/doc/refman/8.0/en/create-table-select.html
You can create one table from another by adding a SELECT statement at the end of the CREATE TABLE statement: CREATE TABLE new_tbl [AS] SELECT * FROM orig_tbl; MySQL creates new columns for all elements in the SELECT. For example: mysql> CREATE ...
https://dev.mysql.com/doc/refman/8.0/en/mysqlpump.html
While a --single-transaction dump is in process, to ensure a valid dump file (correct table contents and binary log coordinates), no other connection should use the following statements: ALTER TABLE, CREATE TABLE, DROP TABLE, RENAME TABLE, TRUNCATE ... mysqlpump Invocation Syntax mysqlpump Option Summary mysqlpump Option Descriptions mysqlpump Object Selection mysqlpump Parallel Processing mysqlpump Restrictions The mysqlpump client utility performs logical backups, producing a set of SQL statements that can be executed to reproduce the original database object definitions and table ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-persistent-stats.html
You can also configure automatic statistics recalculation for individual tables by specifying the STATS_AUTO_RECALC clause when creating or altering a table. To override these system-wide settings and configure optimizer statistics parameters for ...