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Is there a performance issue in PostgreSQL database?
Don’t look further: you probably have a major performance issue on your database. We had this problem in one of our customers project, too. We took concrete actions to fix it: gather data, understand and pinpoint the major issues, and fix them. Here is what we learned on the way.
Which is the Order of evaluation in PostgreSQL?
PostgreSQL evaluates the clauses in the SELECT statment in the following order: FROM, SELECT, and ORDER BY: Due to the order of evaluation, if you have a column alias in the SELECT clause, you can use it in the ORDER BY clause.
How to tune the performance of PostgreSQL server?
Table of content Designing the Machine 3 Huge pages 9 PostgreSQL Tuning Starting Points 11 Configuration & Authentication 11 max_connections 11
When to remove indexes in PostgreSQL to improve performance?
Sometimes indexes are not used because there are not enough rows in the table. So if the table is new, you should wait a few weeks before removing them. It’s always possible to do better, and spend more time to improve performance.
Why are my PostgreSQL queries so slow?
Slow queries mean that the application feels unresponsive and slow and this results in bad conversion rates, unhappy users, and all sets of problems. OLTP is one of the common use cases for PostgreSQL therefore you want your queries to run as smooth as possible.
What to do if PostgreSQL is not logging?
If you do not see any logs, you may want to enable logging_collector = on as well. The logs will include all of the traffic coming to PostgreSQL system tables, making it more noisy. For our purposes let’s stick to the database level logging. ? You can see information about the query and its duration.
When to pay attention to CPU in Postgres?
The priority is to watch the CPU, but you could also pay attention to the number of connections, or to the free disk space. As you can see in this graph, we set an alert up for when the CPU reaches 80%. This is a high number which the CPU has a low chance to reach in a healthy situation.