Re: postgresql 9.5 has ocuuered OOM

On Wednesday, December 20, 2017 11:08:51 PM PST mark wrote:

I have set shared_buffers is 1/4 of memory. work_mem is 2% of memory. max_connections is 50. momery size is 16GB. postgresql process used over 70% of memory and occuered OOM. what should I do to deal with this problem?

IIRC work_mem is a PER CONNECTION setting, that means every connection can use 2% of your total memory. I'd try setting work_mem to something like 16MB or 32MB and see if the queries still execute properly. You want to set work_mem as high as needed to allow proper query execution but as low as possible to avoid running out of memory.