I may have missed this but have you tuned your postgresql
configuration ?
8.2 tuning guidelines are significantly different than 7.3
Dave
On 1-Apr-07, at 1:51 PM, Xiaoning Ding wrote:
I repeated the test again. It took 0.92 second under 8.2.3.
I checked system load using top and ps. There is no other
active processes.
Xiaoning
Ron Mayer wrote:
Xiaoning Ding wrote:
Postgresql is 7.3.18. [...]
1 process takes 0.65 second to finish.
I update PG to 8.2.3. The results are [...] now.
1 process : 0.94 second
You sure about your test environment? Anything else
running at the same time, perhaps?
I'm a bit surprised that 8.2.3 would be 40% slower than 7.3.18
even in the single process case.
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TIP 2: Don't 'kill -9' the postmaster
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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match
