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[1.5.x] Fixed #16992 -- Added InnoDB warning regarding reuse of AUTO_…

…INCREMENT values.

Thanks kent at nsc.liu.se for the report.

Backport of c54fa1a from master
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commit 37587624bf79490e97da1bd04547cdce8b77b9fb 1 parent afc624c
@kedmiston kedmiston authored timgraham committed
Showing with 4 additions and 1 deletion.
  1. +4 −1 docs/ref/databases.txt
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5 docs/ref/databases.txt
@@ -161,7 +161,10 @@ full-text indexing and searching.
Since MySQL 5.5.5, the default storage engine is InnoDB_. This engine is fully
transactional and supports foreign key references. It's probably the best
-choice at this point.
+choice at this point. However, note that the the InnoDB autoincrement counter
+is lost on a MySQL restart because it does not remember the
+``AUTO_INCREMENT`` value, instead recreating it as "max(id)+1". This may
+result in an inadvertent reuse of :class:`~django.db.models.AutoField` values.
If you upgrade an existing project to MySQL 5.5.5 and subsequently add some
tables, ensure that your tables are using the same storage engine (i.e. MyISAM
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