Gaetano Mendola wrote:
Torsten Schulz wrote:
Yes, I know: very difficult question, but I don't know what to do now.
Our Server: Dual-CPU with 1.2 GHz 1.5 GB RAM
Our Problem: We are a Community. Between 19 and 21 o clock we have >350 User in the Community. But then, the Database are very slow. And we have per CPU ~20-30% idle-time.
May we know the postgres version that you are running and see the query that run slow ?
Postgres: 7.3.2 Query: All queries
Configuration:
max_connections = 1000 # Must be, if lower then 500 we become connection-errors
shared_buffers = 5000 # 2*max_connections, min 16
max_fsm_relations = 1000 # min 10, fsm is free space map
max_fsm_pages = 2000000 # min 1000, fsm is free space map
max_locks_per_transaction = 64 # min 10
wal_buffers = 2000 # min 4
sort_mem = 32768 # min 32 vacuum_mem = 32768 # min 1024
fsync = false
enable_seqscan = true enable_indexscan = true enable_tidscan = true enable_sort = true enable_nestloop = true enable_mergejoin = true enable_hashjoin = true
effective_cache_size = 96000 # default in 8k pages
With 500 connection at the sime time 32MB for sort_mem can be too much. What say "iostat 1" and "vmstat 1" ?
Try also to reduce this costs:
random_page_cost = 2.5 cpu_tuple_cost = 0.005 cpu_index_tuple_cost = 0.0005
BTW take a query and show us the result of explain analyze.
Regards Gaetano Mendola
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