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

Hi all

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 analyse 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:

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

Some server config information currently are:

1. data/ directory size is 526G

2. Total memory is 24G

*postgresql.conf:*

# - Memory -

shared_buffers = 1024MB # min 128kB

# actively intend to use prepared transactions.

work_mem = 128MB # min 64kB

maintenance_work_mem = 512MB # min 1MB

checkpoint_segments = 30 # in logfile segments, min 1, 16MB
each

#checkpoint_timeout = 5min # range 30s-1h

checkpoint_completion_target = 0.9 # checkpoint target duration, 0.0 -
1.0

*From /etc/sysctl.conf file I have: *

# Controls the maximum shared segment size, in bytes

kernel.shmmax = 68719476736

# Controls the maximum number of shared memory segments, in pages

kernel.shmall = 4294967296

Thanks

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