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Added a note about long-running processes.

There isn't much else to say, really.
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1 parent 17cf299 commit 189fb4e29463a2e1ee1a86a6c29c94f9f9904d6f @aaugustin aaugustin committed Mar 7, 2013
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  1. +7 −0 docs/topics/db/transactions.txt
@@ -164,6 +164,13 @@ Django provides a single API to control database transactions.
- releases or rolls back to the savepoint when exiting an inner block;
- commits or rolls back the transaction when exiting the outermost block.
+.. admonition:: Performance considerations
+ Open transactions have a performance cost for your database server. To
+ minimize this overhead, keep your transactions as short as possible. This
+ is especially important of you're using :func:`atomic` in long-running
+ processes, outside of Django's request / response cycle.

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