Message-ID: <4D6E2495.9010400@cs.helsinki.fi>
Date: Wed, 02 Mar 2011 13:05:57 +0200
From: Marko Tiikkaja <marko.tiikkaja@cs.helsinki.fi>
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To: Tom Lane <tgl@sss.pgh.pa.us>
CC: pgsql-docs@postgresql.org
Subject: ModifyTable, EXPLAIN ANALYZE and AFTER triggers
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Hi,

The recent commit 09b49a8439fde63826f93f55430868cf2585644b claims:

+    Time spent firing triggers, if any, is charged to the Insert,
+    Update, or Delete node, and is also shown separately for each trigger.
+    Note, however, that deferred triggers will not be fired until end of
+    transaction and are thus not accounted for in the output of
+    <command>EXPLAIN ANALYZE</command>.

But that's only part of the truth; the ModifyTable nodes queue AFTER 
triggers, but don't actually fire them.  I remember there was some 
discussion during 9.0's development about making the ModifyTable nodes 
also count the time spent firing AFTER triggers, but I don't remember 
what we decided back then.  Meanwhile, I think this part in the 
documentation needs a small clarification.


Regards,
Marko Tiikkaja