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Correct mistaken claims about EXPLAIN ANALYZE's handling of triggers.

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Time spent executing AFTER triggers is not included in the runtime of the
associated ModifyTable node; in my patch of yesterday I confused queuing of
these triggers with their actual execution.  Spotted by Marko Tiikkaja.
This commit is contained in:
Tom Lane 2011-03-02 11:17:03 -05:00
parent 4c966d920f
commit 7e49330cad
1 changed files with 7 additions and 4 deletions
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11
doc/src/sgml/perform.sgml
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@ -436,10 +436,13 @@ WHERE t1.unique1 < 100 AND t1.unique2 = t2.unique2;
applying the table changes is charged to a top-level Insert, Update,
or Delete plan node. (The plan nodes underneath this node represent
the work of locating the old rows and/or computing the new ones.)
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
Time spent executing <literal>BEFORE</> triggers, if any, is charged to
the related Insert, Update, or Delete node, although time spent executing
<literal>AFTER</> triggers is not. The time spent in each trigger
(either <literal>BEFORE</> or <literal>AFTER</>) is also shown separately
and is included in total runtime.
Note, however, that deferred constraint triggers will not be executed
until end of transaction and are thus not shown by
<command>EXPLAIN ANALYZE</command>.
</para>