Which is the best way to tune PostgreSQL performance?

Which is the best way to tune PostgreSQL performance?

When it comes to PostgreSQL performance tuning an application, one rule applies: don’t optimize early. Start first by implementing your database and schema. Then when you’ve got your optimal setup, you can start to monitor your SQL queries with tools like Retrace. This is important because PostgreSQL performance tuning is all about trade-offs.

What do you need to know about PostgreSQL optimization?

With every table you add and every query you run, your databases will require maintenance and updates to ensure ideal PostgreSQL optimization. PostgreSQL optimization is pretty straight-forward, however, there are some things that it needs to know from you, the database admin, in order to run effectively.

Why does PostgreSQL need a bigger cache?

The bigger your cache, the less your database will need to go out to disk—which can be painful for performance. PostgreSQL tries to hold the most frequently accessed data in memory to make performance improvements based on how your queries are performed and the configuration that you give it.

What kind of IO does PostgreSQL use?

PostgreSQL uses its own buffer and also uses kernel buffered IO. That means data is stored in memory twice, first in PostgreSQL buffer and then kernel buffer. Unlike other databases, PostgreSQL does not provide direct IO.

How to calculate configuration for PostgreSQL based on?

You need provide basic information about your hardware configuration, where is working PostgreSQL database. Results will be calculated after clicking “Generate” button More information about “DB Type” setting:

What does it mean when PostgreSQL won’t start?

PostgreSQL is having an error on startup and to find out what it is you will have to start PostgreSQL manually. PostgreSQL does not log its startup failures as often as you would hope and how i find out what is going on is by starting a cmd.exe window under the postgres user and manually starting PostgreSQL. Enter in the postgres password.

How can I change the settings of my PostgreSQL server?

PostgreSQL settings can be manipulated a number of different ways, but generally you will want them changed in your configuration files, either directly or, starting with PostgreSQL 9.4, through ALTER SYSTEM.

Why is the Postgres query optimizer not working?

Environmental factors can and do change the way Postgres query optimizer works. Two examples: when a machine has less memory PostgreSQL may not be able to perform a Hash Join when otherwise it would be able to and would make the join faster.

How to identify PostgreSQL performance issues with slow queries?

OLTP is one of the common use cases for PostgreSQL therefore you want your queries to run as smooth as possible. In this blog we’d like to talk about how you can identify problems with slow queries in PostgreSQL. Generally speaking, the most typical way of identifying performance problems with PostgreSQL is to collect slow queries.

How to speed up delete time in PostgreSQL?

Continue until you’re happy with the single line delete response time (I got one query to go from 25.6 seconds to 15 ms or about 1700x faster simply by adding different indexes). Then you can proceed to complete your full delete without any hacks.

Why is delete Cascade trigger slow in PostgreSQL?

As it turns out, those ON DELETE CASCADE triggers were slowing things down quite a bit, because those cascaded deletions were awfully slow. I solved the problem by creating indexes on the foreign key fields on the referencing tables, and I went from taking a bunch of hours for the deletion to a few seconds.

How to reduce request size in PostgreSQL server?

To reduce the request size (currently 415776768 bytes), reduce PostgreSQL’s shared_buffers parameter (currently 50000) and/or its max_connections parameter (currently 12). See Managing Kernel Resources for details on how to correct this.