Re: [PERFORM] Almost infinite query - Different Query Plan when changing where clause value

2010-02-16 Thread lionel duboeuf
Here is my log analysis: Due to a database recovery task it appears that: I stopped postgresql I started postgresql (and as default autovacuum daemon) I restored the databases (need to restore 4 databases) It seems that after database 1 have been restored, autovacumm started on it

Re: [PERFORM] Almost infinite query - Different Query Plan when changing where clause value

2010-02-16 Thread lionel duboeuf
Here is my log analysis: Due to a database recovery task it appears that: I stopped postgresql I started postgresql (and as default autovacuum daemon) I restored the databases (need to restore 4 databases) It seems that after database 1 have been restored, autovacumm started on it

[PERFORM] Why index is not using here?

2010-02-16 Thread AI Rumman
I am getting seq_scan on vtiger_account. Index is not using. Could anyone please tell me what the reason is? explain analyze select * from vtiger_account LEFT JOIN vtiger_account vtiger_account2 ON vtiger_account.parentid = vtiger_account2.accountid

Re: [PERFORM] Why index is not using here?

2010-02-16 Thread AI Rumman
A mistake on the previous mail. explain analyze select * from vtiger_account LEFT JOIN vtiger_account vtiger_account2 ON vtiger_account.parentid = vtiger_account2.accountid QUERY PLAN

Re: [PERFORM] Almost infinite query - Different Query Plan when changing where clause value

2010-02-16 Thread Kevin Grittner
lionel duboeuf wrote: I stopped postgresql I started postgresql (and as default autovacuum daemon) I restored the databases (need to restore 4 databases) It seems that after database 1 have been restored, autovacumm started on it and has been stopped while restoring database 2. Does

Re: [PERFORM] Dell PERC H700/H800

2010-02-16 Thread Bruce Momjian
Greg Smith wrote: I've been full-on vocally anti-Dell ever since they started releasing PCs with the non-standard ATX power supply pinout; that was my final straw with their terrible quality decisions. Yep, makes me feel validated for all of the anti-Dell advice I have given over the years

Re: [PERFORM] Why index is not using here?

2010-02-16 Thread Kevin Grittner
AI Rumman rumman...@gmail.com wrote: Merge Left Join (cost=0.00..1383629.28 rows=231572 width=264) (actual time=0.166..1924.417 rows=231572 loops=1) Merge Cond: (outer.parentid = inner.accountid) - Index Scan using vtiger_account_parentid_idx on vtiger_account (cost=0.00..642475.34

Re: [PERFORM] Almost infinite query - Different Query Plan when changing where clause value

2010-02-16 Thread lionel duboeuf
Thank you Kevin and Scott for all the explanations. ;-) regards Lionel -- Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance

Re: [PERFORM] Almost infinite query - Different Query Plan when changing where clause value

2010-02-16 Thread lionel duboeuf
lionel duboeuf a écrit : Thank you Kevin and Scott for all the explanations. ;-) regards Lionel Sorry for forgetting Jorge also. regards. All this ,encourage me to know more about database management. -- Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) To make

[PERFORM] another 8.1-8.4 regression

2010-02-16 Thread Ben Chobot
I'm having problems with another one of my queries after moving from 8.1.19 to 8.4.2. On 8.1.19, the plan looked like this: http://wood.silentmedia.com/bench/8119 That runs pretty well. On 8.4.2, the same query looks like this: http://wood.silentmedia.com/bench/842_bad If I turn off mergejoin

Re: [PERFORM] Linux I/O tuning: CFQ vs. deadline

2010-02-16 Thread Jeff Davis
On Mon, 2010-02-08 at 09:49 -0800, Josh Berkus wrote: FWIW, back when deadline was first introduced Mark Wong did some tests and found Deadline to be the fastest of 4 on DBT2 ... but only by about 5%. If the read vs. checkpoint analysis is correct, what was happening is the penalty for

Re: [PERFORM] another 8.1-8.4 regression

2010-02-16 Thread Ben Chobot
On Feb 16, 2010, at 1:29 PM, Ben Chobot wrote: I'm having problems with another one of my queries after moving from 8.1.19 to 8.4.2. On 8.1.19, the plan looked like this: http://wood.silentmedia.com/bench/8119 That runs pretty well. On 8.4.2, the same query looks like this:

Re: [PERFORM] 8.1 - 8.4 regression

2010-02-16 Thread Tom Lane
Ben Chobot be...@silentmedia.com writes: Awesome, that did the trick. Thanks Tom! So I understand better, why is my case not the normal, better case? Well, the short answer is that the 8.4 changes here are in the nature of two steps forward and one step back. The long-term goal is to increase