Re: [PERFORM] sort_mem affect on inserts?
Josh Berkus wrote: I was under the impression that work_mem would be used for the index if there was an index for the RI lookup. Wrong? Yes -- work_mem is not used for doing index scans, whether for RI lookups or otherwise. -Neil ---(end of broadcast)--- TIP 8: explain analyze is your friend
Re: [PERFORM] sort_mem affect on inserts?
On 11/17/2004 5:07 PM, Josh Berkus wrote: David, I understand that the sort_mem conf setting affects queries with order by, etc., and the doc mentions that it is used in create index. Does sort_mem affect the updating of indexes, i.e., can the sort_mem setting affect the performance of inserts? Only if the table has Foriegn Keys whose lookup might require a large sort. Otherwise, no. Hmmm ... what type of foreign key lookup would that be? None of the RI generated queries has any order by clause. Jan -- #==# # It's easier to get forgiveness for being wrong than for being right. # # Let's break this rule - forgive me. # #== [EMAIL PROTECTED] # ---(end of broadcast)--- TIP 6: Have you searched our list archives? http://archives.postgresql.org
Re: [PERFORM] sort_mem affect on inserts?
Jan, Hmmm ... what type of foreign key lookup would that be? None of the RI generated queries has any order by clause. I was under the impression that work_mem would be used for the index if there was an index for the RI lookup. Wrong? -- --Josh Josh Berkus Aglio Database Solutions San Francisco ---(end of broadcast)--- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faqs/FAQ.html
[PERFORM] sort_mem affect on inserts?
I understand that the sort_mem conf setting affects queries with order by, etc., and the doc mentions that it is used in create index. Does sort_mem affect the updating of indexes, i.e., can the sort_mem setting affect the performance of inserts? - DAP -- David ParkerTazz Networks(401) 709-5130 ---(end of broadcast)--- TIP 9: the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match
Re: [PERFORM] sort_mem affect on inserts?
David, I understand that the sort_mem conf setting affects queries with order by, etc., and the doc mentions that it is used in create index. Does sort_mem affect the updating of indexes, i.e., can the sort_mem setting affect the performance of inserts? Only if the table has Foriegn Keys whose lookup might require a large sort. Otherwise, no. -- --Josh Josh Berkus Aglio Database Solutions San Francisco ---(end of broadcast)--- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faqs/FAQ.html
