Re: I am working on trying to improve a database perfomance in version 9.2 Postgresql database server

[Venkata Balaji N <nag1010@xxxxxxxxx>]

 I need some help in trying improve database performance on the server that has 103 databases running in one server. Autovacuum is switched off intentionally , it was causing issues until I implemented a script where I run vacuum analyze every Sunday of the week, I don’t know if it’s enough or not but each database receive about 4000 new transactions a day.  I run VACUUM ANALYZE in each active database that’s on this server. Currents are like when I try to create a new database on the same server using a created command, it takes long to finish, hence takes to restore a database on the server. Sometimes the load average hits about 20 to 30 when there is many things running on the server. It takes about 6 hours for this vacuum to finish running in all these databases every Sunday. Is it necessary to run any REINDEXes.

 

Any advices will help, see some information below:

PostgreSQL version ?

Do you have all the 103 database in one cluster ? I suspect a DISK IO and CPU spike. Do you see that ?

Its hard to say straight if there is a need for REINDEXING. Can you let us know the hardware specifications of the server.

We will need to understand if the server capacity is falling short for the load being received. 

How many active connections you see at the database level ?

 

I am thinking of increasing values on the following parameters in the conf file after some reading ing http://www.postgresql.org/docs/9.2/static/runtime-config-resource.html

 

Parameters:

 

work_mem

shared_buffers

maintenance_work_mem

checkpoint_segments

 

We need to know the hardware specifications.  

 Some server config information currently are:

 

1.       data/ directory size is 526G

2.       Total memory  is 24G

Do you see any over utilization of the memory.

Regards,

Venkata Balaji N