On 29 October 2010 13:24, AI Rumman <rummandba@xxxxxxxxx> wrote:
I am using Postgresql 8.1 in 8-cpu cores with 32 gb ram with CestOS 5.I have different DBs in the system and the large one is 12 GB and it is a CRM DB and heavily used.Every day after 1 pm the system gets slow and after analyzing the nmon spreadsheet, I found that IO spike at that period.Users write data much at that period of time.DB parameters are as follows:max_connections= 500
shared_buffers=122144
effective_cache_size = 1835010
work_mem = 8192
max_fsm_pages= 356656
fsync=on
commit_delay=0
commit_siblings= 5
random_page_cost = 0.01
default_statistics_target=100
wah_buffers = 500
Any idea please how to find the bottleneck and improve performance.
Let me know if any more information is needed.
What's your checkpoint_segments setting? You may wish to up it if you're getting many inserts/updates.
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Thom Brown
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