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https://dev.mysql.com/doc/refman/8.0/en/innodb-undo-tablespaces.html
Default undo tablespaces are created at initialization time to provide a location for rollback segments that must exist before SQL statements can be accepted. Default undo tablespaces are created in the location defined by the innodb_undo_directory ... Undo tablespaces contain undo logs, which are collections of records containing information about how to undo the latest change by a transaction to a clustered index ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-online-ddl-space-requirements.html
Temporary log files: A temporary log file records concurrent DML when an online DDL operation creates an index or alters a table. Temporary sort files: Online DDL operations that rebuild the table write temporary sort files to the MySQL temporary ...
https://dev.mysql.com/doc/refman/8.0/en/show-columns.html
The data types may differ from what you expect them to be based on a CREATE TABLE statement because MySQL sometimes changes data types when you create or alter a table. The SHOW CREATE TABLE, SHOW TABLE STATUS, and SHOW INDEX statements also provide ... SHOW [EXTENDED] [FULL] {COLUMNS | FIELDS} {FROM | IN} tbl_name [{FROM | IN} db_name] [LIKE 'pattern' | WHERE expr] SHOW COLUMNS displays information about the columns in a given ...
https://dev.mysql.com/doc/refman/8.0/en/myisamchk-check-options.html
myisamchk supports the following options for table checking operations: --check, -c Command-Line Format --check Check the table for errors. --check-only-changed, -C Command-Line Format --check-only-changed Check only tables that have changed since ...This is the default operation if you specify no option that selects an operation type ...
https://dev.mysql.com/doc/refman/8.0/en/faqs-cjk.html
Why do I get Incorrect string value error messages? To see the problem, create a table with one Unicode (ucs2) column and one Chinese (gb2312) column. mysql> CREATE TABLE ch (ucs2 CHAR(3) CHARACTER SET ucs2, gb2312 CHAR(3) CHARACTER SET gb2312); In ...Does MySQL permit CJK characters to be used in database and table names? ... This set of Frequently Asked Questions derives from the experience of MySQL's Support and ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning-hash.html
To partition a table using HASH partitioning, it is necessary to append to the CREATE TABLE statement a PARTITION BY HASH (expr) clause, where expr is an expression that returns an integer. In addition, you most likely want to follow this with ...
https://dev.mysql.com/doc/refman/8.0/en/audit-log-filtering.html
The audit_log plugin operates in legacy mode if it is installed but the accompanying audit tables and functions are not created. Note For audit log filtering to work as described here, the audit log plugin and the accompanying audit tables and ...
https://dev.mysql.com/doc/refman/8.0/en/stored-objects-security.html
If a definition omits the DEFINER attribute, the default object definer is the user who creates it. Creating a stored object with a nonexistent DEFINER account creates an orphan object, which may have negative consequences; see Orphan Stored Objects. This account must have the EXECUTE privilege for p1 as well as the UPDATE privilege for the table t1 referenced within the object ... Stored programs (procedures, functions, triggers, ...
https://dev.mysql.com/doc/refman/8.0/en/events-privileges.html
This user then creates the following event: CREATE EVENT e_insert ON SCHEDULE EVERY 7 SECOND DO INSERT INTO myschema.mytable; After this event has been created, root revokes the EVENT privilege for jon@ghidora. The EVENT privilege governs the ... To ...
https://dev.mysql.com/doc/refman/8.0/en/alter-tablespace.html
Once a data file has been created, its size cannot be changed; however, you can add more data files to an NDB tablespace using additional ALTER TABLESPACE ... ADD DATAFILE is used with ENGINE = NDB, a data file is created on each Cluster data node, ...It can be used to add a new data file to, or to drop a data file from an NDB ...You may optionally follow size with a ...