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 donâ??t know if itâ??s enough or not but each database receive about 4000 new transactions a day. I run VACUUM ANALYZE in each active database thatâ??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   Â
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