postgresql: large insert duration -

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the database postgresql 9.3.

there big table, 70 more columns. use case 700 inserts per second, , each insert takes 1 row.

here key items in postgresql.conf:

shared_buffers = 1024mb # system memory 8096mb in total work_mem = 32mb maintenance_work_mem = 128mb  bgwriter_delay = 20ms  synchronous_commit = off  checkpoint_segments = 64 checkpoint_completion_target = 0.9  effective_cache_size = 4096mb  log_min_duration_statement = 1000

the log show duration of inserts exceed 1 second, after number of rows reaches ten million.

anybody help?


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