| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Tobias Brox <tobias(at)nordicbet(dot)com> |
| Cc: | Kjell Tore Fossbakk <kjelltore(at)gmail(dot)com>, Michael Glaesemann <grzm(at)myrealbox(dot)com>, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: Querying 19million records very slowly |
| Date: | 2005-06-22 13:50:39 |
| Message-ID: | 27060.1119448239@sss.pgh.pa.us |
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| Lists: | pgsql-performance |
Tobias Brox <tobias(at)nordicbet(dot)com> writes:
>> time (datetime) > '2005-06-21 10:36:22+02'
>> or
>> time (timestamp) > 'some timestamp pointing to yesterday'
> If I have understood it correctly, the planner will recognize the timestamp
> and compare it with the statistics in the first example but not in the
> second, and thus it will be more likely to use index scan on the first one
> and seqscan on the second.
That statement is true for releases before 8.0. Kjell has not at any
point told us what PG version he is running, unless I missed it...
regards, tom lane
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