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Document DROP FOREIGN KEY constraint_name limitation.

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This commit is contained in:
Daniel Nichter
2012-08-13 15:19:57 -06:00
parent 217a45df6f
commit a657f5bc3a
1 changed files with 11 additions and 0 deletions
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11
bin/pt-online-schema-change
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@@ -7991,6 +7991,17 @@ If you add a column without a default value and make it NOT NULL, the tool
will fail, as it will not try to guess a default value for you; You must
specify the default.
=item *
C<DROP FOREIGN KEY constraint_name> requires specifying C<_constraint_name>
rather than the real C<constraint_name>. Due to a limitation in MySQL,
pt-online-schema-change adds a leading underscore to foreign key constraint
names when creating the new table. For example, to drop this contraint:
CONSTRAINT `fk_foo` FOREIGN KEY (`foo_id`) REFERENCES `bar` (`foo_id`)
You must specify C<--alter "DROP FOREIGN KEY _fk_foo">.
=back
=item --alter-foreign-keys-method