Tom Lane wrote:Rajesh Kumar Mallah <[EMAIL PROTECTED]> writes:SELECT DISTINCT main.* FROM ( ( ( ( Tickets main JOIN Groups as Groups_1 ON ( main.id = Groups_1.Instance) ) JOIN Principals as Principals_2 ON ( Groups_1.id = Principals_2.ObjectId) ) JOIN CachedGroupMembers as CachedGroupMembers_3 ON ( Principals_2.id = CachedGroupMembers_3.GroupId) ) JOIN Users as Users_4 ON ( CachedGroupMembers_3.MemberId = Users_4.id) ) WHERE ...I think the reason for the performance difference is that 7.3 treats JOIN syntax as forcing a particular join order, while 7.4 doesn't. Just out of curiosity , how does 7.4 determine the optimal Join Order? is it GEQO in case of 7.4 although i did not enable it explicitly? Thanks for the reply , I sent the EXPLAINs also just now. What i really want is to help improving the Pg specific Component for DBIx::SearchBuilder. The module is being widely used in the mod_perl world and has impact on the performance perception of PostgreSQL. regards, tom lane |
- Re: [PERFORM] Query puts 7.3.4 on endless... Rajesh Kumar Mallah
- Re: [PERFORM] Query puts 7.3.4 on end... Greg Stark
- Re: [PERFORM] Query puts 7.3.4 on end... Greg Stark
- Re: [PERFORM] Query puts 7.3.4 o... Rajesh Kumar Mallah
- Re: [PERFORM] Query puts 7.3.4 o... Greg Stark
- Re: [PERFORM] Query puts 7.3.4 o... Rajesh Kumar Mallah
- Re: [PERFORM] Query puts 7.3.4 o... Rajesh Kumar Mallah
- Re: [PERFORM] Query puts 7.3.4 o... Greg Stark
- [ PROBLEM SOLVED ] Re: [PERFORM]... Rajesh Kumar Mallah
- Re: [PERFORM] Query puts 7.3.4 on endless loop but 7.4... Tom Lane
- Rajesh Kumar Mallah