Introduction
You often need to check the performance of a PostgreSQL query you just wrote to look for some way to improve performance. In order to do this, you need a report of the query execution, which is called the execution plan). The query execution plan gives you the entire summary of the query execution with the detailed report of time taken at each step and cost incurred to finish it.
The EXPLAIN keyword in PostgreSQL helps you to generate the execution plan of a query in PostgreSQL. The syntax for creating the plan in PostgreSQL is:
EXPLAIN [ (