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manual.texi:

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Added foreign key def syntax + note that the check is not deferred to trx commit


Docs/manual.texi:
  Added foreign key def syntax + note that the check is not deferred to trx commit
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unknown 2001-11-23 01:21:42 +02:00
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@ -35283,6 +35283,12 @@ your job again, rather than wait for millions of disk i/os to complete.
InnoDB version 3.23.44 features foreign key constraints. InnoDB is the InnoDB version 3.23.44 features foreign key constraints. InnoDB is the
first MySQL table type which allows you to define foreign key first MySQL table type which allows you to define foreign key
constraints to guard the integrity of your data. constraints to guard the integrity of your data.
The syntax of a foreign key constraint definition in InnoDB:
@example
FOREIGN KEY (index_col_name, ...) REFERENCES table_name (index_col_name, ...)
@end example
An example: An example:
@example @example
@ -35303,6 +35309,8 @@ The size and the signedness of integer types has to be same.
When doing foreign key checks InnoDB sets shared row When doing foreign key checks InnoDB sets shared row
level locks on child or parent records it has to look at. level locks on child or parent records it has to look at.
InnoDB checks foreign key constraints immediately: the check
is not deferred to transaction commit.
InnoDB allows you to drop any table even though that InnoDB allows you to drop any table even though that
would break the foreign key constraints which reference would break the foreign key constraints which reference