On 29 October 2010 13:24, AI Rumman <rumman...@gmail.com> 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.
-- Thom Brown Twitter: @darkixion IRC (freenode): dark_ixion Registered Linux user: #516935
