At present, checkpoint_segment=3 checkpoint_timeout=300 On 10/29/10, Thom Brown <thom@xxxxxxxxx> wrote: > 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. > > -- > Thom Brown > Twitter: @darkixion > IRC (freenode): dark_ixion > Registered Linux user: #516935 > -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
