Re: RAM usage of PostgreSql
Prasad wrote: > I have installed PostgreSQL 9.4 (open source) version on my CentOS > Linux Red Hat 7 production server and kept default parameters which > are in postgresql.conf file.So my basic question is, once I start > using postgres how much RAM the postgres processes consumes > (postgres related processes only). > > There are lot of allocations in postgresql.conf file, for example > shared_buffers, work_mem...etc. > > As per my knowledge, all postgres processes should not consume the > RAM more than the value assigned in shared_buffers.Please clarify > and let me know if I misunderstand the concept.. shared_buffers only determines the shared memory cache, each database process still needs private memory. As a rule of thumb, start with shared_buffers set to 1/4 of your available RAM, but no more than 8GB. Yours, Laurenz Albe -- Cybertec | https://www.cybertec-postgresql.com
Re: RAM usage of PostgreSql
Hi, |Cc: pgsql-nov...@postgresql.org, pgsql-performa...@postgresql.org Please don't cross post to multiple lists. On Thu, Apr 04, 2019 at 08:18:01PM +0530, Prasad wrote: > There are lot of allocations in postgresql.conf file, for example > shared_buffers, work_mem...etc. > > As per my knowledge, all postgres processes should not consume the RAM more > than the value assigned in shared_buffers.Please clarify and let me know if > I misunderstand the concept.. shared_buffers is what's *reserved* for postgres and unavailable for other processes whenever PG is running. work_mem is what each postgres process might use, if needed. When complete, that's returned to the OS. Note that an expensive query might actually use some multiple of work_mem (it's per sort/hash node and also per parallel process, and also hash aggregate can sometimes use more than work_mem). Justin
RAM usage of PostgreSql
Hi, I have installed PostgreSQL 9.4 (open source) version on my CentOS Linux Red Hat 7 production server and kept default parameters which are in postgresql.conf file.So my basic question is, once I start using postgres how much RAM the postgres processes consumes (postgres related processes only). There are lot of allocations in postgresql.conf file, for example shared_buffers, work_mem...etc. As per my knowledge, all postgres processes should not consume the RAM more than the value assigned in shared_buffers.Please clarify and let me know if I misunderstand the concept.. -- Thanks, Venkata Prasad
