Tune PostGres for Faster Inserts

Insertions in PostGreSQL take a while, especially for large amounts of data. A project of mine at work sees both large batch updates and another sees single insert statements in a way that they are preferable over others. There are ways to tune PostgreSQL to make sure that you are achieving the most out of your database.



These variables should be in postgres.conf.

  • Tune the Wal (write-ahead logging) with wal_logging set to minimal and ensure a decent wal_writer_delay: When Wal logging times are short and content large, this can greatly effect servers. 10,000 record inserts went from 30 minutes to 2 seconds by extending the wal_writer_delay from per transaction (0 seconds) to 100 milliseconds. The default delay is 200 milliseconds
  • Increase thread limits: Increased thread limits help large transactions. A 10,000 record batch update in my case went from 15 minutes to 3 seconds when thread limits went from 10000 to 50000 threads

Be aware that other configurations will affect your system and that Wal logging is necessary for replication as Wal logs are used to recreate the state in a hot-swapping environment.

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