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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