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MySQL 8.0 Reference Manual
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13.2.6.3 INSERT DELAYED Syntax

INSERT DELAYED ...

The DELAYED option for the INSERT statement is a MySQL extension to standard SQL. In previous versions of MySQL, it can be used for certain kinds of tables (such as MyISAM), such that when a client uses INSERT DELAYED, it gets an okay from the server at once, and the row is queued to be inserted when the table is not in use by any other thread.

DELAYED inserts and replaces were deprecated in MySQL 5.6. In MySQL 8.0, DELAYED is not supported. The server recognizes but ignores the DELAYED keyword, handles the insert as a nondelayed insert, and generates an ER_WARN_LEGACY_SYNTAX_CONVERTED warning (INSERT DELAYED is no longer supported. The statement was converted to INSERT). The DELAYED keyword is scheduled for removal in a future release.