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https://dev.mysql.com/doc/refman/8.0/en/table-maintenance-statements.html
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https://dev.mysql.com/doc/refman/8.0/en/information-functions.html
Beginning with MySQL 8.0.34, this function can be used for the default value of a VARCHAR or TEXT column, as shown in the following CREATE TABLE statement: CREATE TABLE t (c VARCHAR(288) DEFAULT (CURRENT_USER())); DATABASE() Returns the default ...
https://dev.mysql.com/doc/refman/8.0/en/upgrading-what-is-upgraded.html
If the actual data dictionary version is lower than the current expected version, the server creates data dictionary tables with updated definitions, copies persisted metadata to the new tables, atomically replaces the old tables with the new ones, ... Installing a new version of MySQL may require upgrading these parts of the existing installation: The mysql system schema, which contains tables that store information required by the MySQL server as it runs (see Section 7.3, “The mysql System ...
https://dev.mysql.com/doc/refman/8.0/en/update.html
For information about generated columns, see Section 15.1.20.8, “CREATE TABLE and Generated Columns”. UPDATE is a DML statement that modifies rows in a table. An UPDATE statement can start with a WITH clause to define common table expressions ...The SET clause indicates which columns to modify and the values they should be ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning-overview.html
For more information about permitted partitioning column types and partitioning functions, see Section 26.2, “Partitioning Types”, as well as Section 15.1.20, “CREATE TABLE Statement”, which provides partitioning syntax descriptions and ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-benefits.html
InnoDB tables have the following benefits: If the server unexpectedly exits because of a hardware or software issue, regardless of what was happening in the database at the time, you don't need to do anything special after restarting the database.
https://dev.mysql.com/doc/refman/8.0/en/audit-log-filter-definitions.html
The preceding definition can be written like this: { "filter": { "class": [ { "name": [ "connection", "general", "table_access" ] } ] } } Logging Specific Event Subclasses To select specific event subclasses, use an event item containing a name item ...For information about using JSON data in MySQL, see Section 13.5, “The JSON Data ...
https://dev.mysql.com/doc/refman/8.0/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. It is important to create good ...
https://dev.mysql.com/doc/refman/8.0/en/added-deprecated-removed.html
innodb_tmpdir: Directory location for temporary table files created during online ALTER TABLE operations. print_identified_with_as_hex: For SHOW CREATE USER, print hash values containing unprintable characters in hex. Replica_open_temp_tables: ...
https://dev.mysql.com/doc/refman/8.0/en/replication-gtids-concepts.html
A global transaction identifier (GTID) is a unique identifier created and associated with each transaction committed on the server of origin (the source). The MySQL system table mysql.gtid_executed is used to preserve the assigned GTIDs of all the ...This identifier is unique not only to the server on which it originated, but is unique across all servers in a given replication ...