Hi all,
WE currently use PG for the local database on our POS workstations in shops. Data is then extracted and sent back to head office. Also product updates etc are regularly sent to the shops. I have noticed over time that the shop PG databases get slower and slower. If I do a pg_dump, recreate the database and then restore the data - all speed problems are gone and the database folder shrinks in size substantially.
From this information could anyone tell me what are the likely causes and what we may or may not be doing in our extractions and updates that are not good PG insert, update, delete procedures
Thanks
Chris Stokes
Senior Systems Consultant
Bass Software
Phone: +61 3 8415 9305 (Direct)
Fax: +61 3 9427 1752
Mobile: +61 409 851 447 ch****@basssoft ware.com <mailto:ch****@ basssoftware.co m> www.basssoftware.com <http://www.basssoftwar e.com/>
Level 5 534 Church Street
Richmond, Victoria, 3121, Australia
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"Chris Stokes" <Ch****@basssof tware.com> writes: WE currently use PG for the local database on our POS workstations in shops. Data is then extracted and sent back to head office. Also product updates etc are regularly sent to the shops. I have noticed over time that the shop PG databases get slower and slower. If I do a pg_dump, recreate the database and then restore the data - all speed problems are gone and the database folder shrinks in size substantially.
From this information could anyone tell me what are the likely causes and what we may or may not be doing in our extractions and updates that are not good PG insert, update, delete procedures
You should periodically be doing:
a) VACUUM (at least once a day, probably) and
b) REINDEX
Are you doing both of these? See the docs if you're not familiar with
them.
The REINDEX is needed because VACUUM doesn't free up index space in
some circumstances. 7.4 (currently in late beta) will fix this.
-Doug
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On Fri, Oct 31, 2003 at 11:54:55AM +1100, Chris Stokes wrote: Hi all, WE currently use PG for the local database on our POS workstations in shops. Data is then extracted and sent back to head office. Also product updates etc are regularly sent to the shops. I have noticed over time that the shop PG databases get slower and slower. If I do a pg_dump, recreate the database and then restore the data - all speed problems are gone and the database folder shrinks in size substantially. From this information could anyone tell me what are the likely causes and what we may or may not be doing in our extractions and updates that are not good PG insert, update, delete procedures
The three important steps for maintainence of a postgresql database:
1. ANALYZE
2. VACUUM [FULL]
3. REINDEX
Hope this helps,
--
Martijn van Oosterhout <kl*****@svana. org> http://svana.org/kleptog/ "All that is needed for the forces of evil to triumph is for enough good men to do nothing." - Edmond Burke "The penalty good people pay for not being interested in politics is to be governed by people worse than themselves." - Plato
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