Re: [HACKERS] Bitmap Heap Scan anomaly

2007-05-04 Thread jaba the mobzy
AIL PROTECTED]> To: Jeff Davis <[EMAIL PROTECTED]> Cc: jaba the mobzy <[EMAIL PROTECTED]>; pgsql-hackers@postgresql.org Sent: Thursday, May 3, 2007 11:42:32 PM Subject: Re: [HACKERS] Bitmap Heap Scan anomaly Jeff Davis <[EMAIL PROTECTED]> writes: > On Thu, 2007-05-03 at

Re: [HACKERS] Bitmap Heap Scan anomaly

2007-05-03 Thread Tom Lane
Jeff Davis <[EMAIL PROTECTED]> writes: > On Thu, 2007-05-03 at 14:33 -0700, jaba the mobzy wrote: >> mycorr_100 took 11.4 s to run although it had to fetch 10 row from >> the base table. >> mycorr_10 took 24.4 s to run although it had to fetch 10563 row from >> the base table. > This is becaus

Re: [HACKERS] Bitmap Heap Scan anomaly

2007-05-03 Thread Jeff Davis
On Thu, 2007-05-03 at 14:33 -0700, jaba the mobzy wrote: > mycorr_100 took 11.4 s to run although it had to fetch 10 row from > the base table. > mycorr_10 took 24.4 s to run although it had to fetch 10563 row from > the base table. This is because the physical distribution of data is differen