pgtune

A yet another tool to optimize PostgreSQL for dCache namespace or any other online transaction processing (OLTP) workloads.

Based on the information from Tuning Your PostgreSQL Server wiki page.

Usage

$ ./pgtune.py >> /var/lib/pgsql/9.x/data/postgresql.conf

Example output

$ ./pgtune.py
#
# dCache's chimera friendly configuration
#
# Config for 7GB memory and 100 connections
#
checkpoint_completion_target = 0.9
checkpoint_segments = 64
default_statistics_target = 100
effective_cache_size = 5GB
maintenance_work_mem = 496MB
max_connections = 100
shared_buffers = 1GB
synchronous_commit = off
vacuum_cost_delay = 50
wal_buffers = 16MB
wal_writer_delay = 10s
work_mem = 19MB
#
# other goodies
#
log_line_prefix = '%m <%d %u %r> %%'
log_temp_files = 0
log_min_duration_statement = 20
log_checkpoints = on
log_lock_waits = on
listen_addresses = 'localhost'

Streaming replication

The pgtune script creates a configuration stubs for streaming master-slave replication, however you still have to create corresponding recovery.conf on the slave nodes as well as adjust archive_command.

See PostgreSQL wiki on streaming replication configuration.

OS Configuration

For optimal DB performance an optimal hardware and OS configuration required. On RHEL7/8 based system it's ideal to use tuned profile.

Copy tuned.conf file into /etc/tuned/postgres-db-server/tuned.conf and select the profile:

$ yum install tuned
$ wget -O /etc/tuned/postgres-db-server/tuned.conf \
   https://raw.githubusercontent.com/kofemann/pgtune/master/tuned.conf
$ tuned-adm profile postgres-db-server

IMPORTANT: don't forget to do benchmarks defore and after.

Alternatives

• pgtune by 2ndQuadrant.com The original, but not up-to-date tool by Greg Smith
• Web based PgTune Web app build to tune your DB

LICENSE

This work is published under public domain license.