But he's using 8.1.4-- in that version, an explain analyze would list the time taken to go through triggers, so the fact that we don't see any of those lines means that it can't be constraint checking, so wouldn't it have to be the index update overhead?
-- Mark On Wed, 2006-12-13 at 11:46 -0500, Tom Lane wrote: > Arnaud Lesauvage <[EMAIL PROTECTED]> writes: > > Indeed, the new query does not perform that well : > > > "Hash Join (cost=112.75..307504.97 rows=2024869 width=355) (actual > > time=53.995..246443.811 rows=2020061 loops=1)" > > ... > > "Total runtime: 2777844.892 ms" > > > I removed all unnecessary indexes on t1 before running the query (I left > > the index on uid and the multicolumn index containind the updated field). > > I believe the multicolumn-functional-index computation is taking some time > > here, isn't it ? > > Given that the plan itself only takes 246 sec, there's *something* > associated with row insertion that's eating the other 2500+ seconds. > Either index entry computation or constraint checking ... > > regards, tom lane > > ---------------------------(end of broadcast)--------------------------- > TIP 4: Have you searched our list archives? > > http://archives.postgresql.org ---------------------------(end of broadcast)--------------------------- TIP 3: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faq
