This is on a CentOS 6.5 box running PostgreSQL 9.2
On 11/13/14 4:09 PM, CS DBA wrote:
All;
We have a large db server with 128GB of ram running complex functions.
with the server set to have the following we were seeing a somewhat
low hit ratio and lots of temp buffers
shared_buffers = 18GB
work_mem = 75MB
effective_cache_size = 105GB
checkpoint_segments = 128
when we increased the values to these not only did the hit ratio drop
but query times are now longer as well:
shared_buffers = 28GB
work_mem = 150MB
effective_cache_size = 105GB
checkpoint_segments = 256
This does not seem to make sense to me, anyone have any thoughts on
why more memory resources would cause worse performance?
Thanks in advance
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