Обсуждение: Dynamic Catalog Views
Hi All,
Could please guide me in knowing the Dynamic Catalog views which will tell about the Buffers and Cache information using System Catalogs.
Thanks in Advance
Regards
Raghavendra
raghavendra t wrote: > Hi All, > > Could please guide me in knowing the Dynamic Catalog views which will > tell about the Buffers and Cache information using System Catalogs. > you mean, stuff like http://www.postgresql.org/docs/current/static/catalog-pg-statistic.html ? afaik, data about whats in the cache and buffers is not accessible via any pg_catalog schema tables.
On 13 April 2010 05:31, raghavendra t <raagavendra.rao@gmail.com> wrote: > Hi All, > > Could please guide me in knowing the Dynamic Catalog views which will tell > about the Buffers and Cache information using System Catalogs. Look at pg_buffercache contrib. http://www.postgresql.org/docs/8.4/interactive/pgbuffercache.html -- Sergey Konoplev Blog: http://gray-hemp.blogspot.com / Linkedin: http://ru.linkedin.com/in/grayhemp / JID/GTalk: gray.ru@gmail.com / Skype: gray-hemp / ICQ: 29353802
> raghavendra t wrote: >> Hi All, >> >> Could please guide me in knowing the Dynamic Catalog views which will >> tell about the Buffers and Cache information using System Catalogs. >> > > you mean, stuff like > http://www.postgresql.org/docs/current/static/catalog-pg-statistic.html ? > > afaik, data about whats in the cache and buffers is not accessible via > any pg_catalog schema tables. It's not accessible by default, but there is contrib package called 'pg_buffercache': http://www.postgresql.org/docs/8.4/interactive/pgbuffercache.html I guess that might provide the information about buffers. Tomas
Hi All,
Thank you for your support.
Yes, i tried with pg_buffercache, it is giving the information on the hit ratio of shared_buffers. Can we get the dynamic information like in oracle(v$) views. Same as in postgresql buffers(shared,temp,wal) & cache(maintainence_work_me, effective_mem).
Thanks & Regards
Raghavendra
2010/4/13 <tv@fuzzy.cz>
It's not accessible by default, but there is contrib package called> raghavendra t wrote:
>> Hi All,
>>
>> Could please guide me in knowing the Dynamic Catalog views which will
>> tell about the Buffers and Cache information using System Catalogs.
>>
>
> you mean, stuff like
> http://www.postgresql.org/docs/current/static/catalog-pg-statistic.html ?
>
> afaik, data about whats in the cache and buffers is not accessible via
> any pg_catalog schema tables.
'pg_buffercache':
I guess that might provide the information about buffers.
Tomas
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raghavendra t wrote: > Can we get the dynamic information like in oracle(v$) views. Same as > in postgresql buffers(shared,temp,wal) & cache(maintainence_work_me, > effective_mem). The information available in this area includes: 1) Look at buffer cache hit rates using pg_stat_user_tables, pg_statio_user_tables, pg_stat_user_indexes, and pg_statio_user_indexes 2) Dig into pg_buffercache to find out what's sitting in RAM and how well the usage count implementation is working for you 3) Monitor pg_stat_bgwriter to find out what checkpoints are doing 4) Turn on log_temp_files (8.3 or later) to log when work_mem is being exceeded and sorts are going to disk. That's really it; the rest of the sort of data that's available in the v$ views isn't exposed in nearly as much detail in PostgreSQL yet. -- Greg Smith 2ndQuadrant US Baltimore, MD PostgreSQL Training, Services and Support greg@2ndQuadrant.com www.2ndQuadrant.us