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https://dev.mysql.com/doc/refman/8.0/en/innodb-online-ddl-limitations.html
The following limitations apply to online DDL operations: The table is copied when creating an index on a TEMPORARY TABLE. The ALTER TABLE clause LOCK=NONE is not permitted if there are ON...CASCADE or ON...SET NULL constraints on the table. Before ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-persistent-stats.html
The persistent optimizer statistics feature improves plan stability by storing statistics to disk and making them persistent across server restarts so that the optimizer is more likely to make consistent choices each time for a given query.
https://dev.mysql.com/doc/refman/8.0/en/innodb-purge-configuration.html
InnoDB does not physically remove a row from the database immediately when you delete it with an SQL statement. A row and its index records are only physically removed when InnoDB discards the undo log record written for the deletion. This removal ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-read-only-instance.html
You can query InnoDB tables where the MySQL data directory is on read-only media by enabling the --innodb-read-only configuration option at server startup. How to Enable To prepare an instance for read-only operation, make sure all the necessary ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-restrictions-limitations.html
This section describes restrictions and limitations of the InnoDB storage engine. You cannot create a table with a column name that matches the name of an internal InnoDB column (including DB_ROW_ID, DB_TRX_ID, and DB_ROLL_PTR. This restriction ...
https://dev.mysql.com/doc/refman/8.0/en/join.html
MySQL supports the following JOIN syntax for the table_references part of SELECT statements and multiple-table DELETE and UPDATE statements: table_references: escaped_table_reference [, escaped_table_reference] ... index_hint: { USE {INDEX|KEY} ...
https://dev.mysql.com/doc/refman/8.0/en/keyring-aws-plugin.html
Note The keyring_aws plugin is an extension included in MySQL Enterprise Edition, a commercial product. The keyring_aws keyring plugin communicates with the Amazon Web Services Key Management Service (AWS KMS) as a back end for key generation and ...
https://dev.mysql.com/doc/refman/8.0/en/keyring-oci-plugin.html
Note The keyring_oci plugin is an extension included in MySQL Enterprise Edition, a commercial product. The keyring_oci plugin is a keyring plugin that communicates with Oracle Cloud Infrastructure Vault for back end storage. No key information is ...
https://dev.mysql.com/doc/refman/8.0/en/local-variable-scope.html
The scope of a local variable is the BEGIN ... The variable can be referred to in blocks nested within the declaring block, except those blocks that declare a variable with the same name. Because local variables are in scope only during stored ...
https://dev.mysql.com/doc/refman/8.0/en/merge-table-problems.html
The following are known problems with MERGE tables: MERGE child tables are locked through the parent table. If the parent is a temporary table, it is not locked, and thus the child tables are also not locked; this means that parallel use of the ...