PostgreSQL Internals

In PostgreSQL, several reasons can cause SQL statement plans to worsen over time. These changes may lead to decreased query performance and unexpected behavior. Below are some common factors that contribute to deteriorating SQL statement […]

PostgreSQL’s query optimizer (or planner) creates optimal execution plans for SQL queries by evaluating multiple possible plans and selecting the fastest one. [^1] Understanding PostgreSQL’s Approach to Optimizer Hints PostgreSQL takes a deliberately cautious approach […]

PostgreSQL execution plan with run-time In PostgreSQL, you can obtain the execution plan with runtime information using the EXPLAIN (ANALYZE, VERBOSE) command. This command in particular, provides a detailed execution plan along with actual runtime […]

PostgreSQL‘s query optimizer (or planner) creates optimal execution plans for SQL queries by evaluating multiple possibilities and selecting the fastest approach. [^1] As a result, it plays a central role in ensuring efficient query execution. […]

Introduction: Adaptive joins are an exciting feature in PostgreSQL. They dynamically adjust the join method during query execution to optimize performance. This article explores adaptive joins in PostgreSQL, their benefits, and how they can improve […]

In PostgreSQL, the optimizer selects which indexes to use for query execution based on cost-based optimization. The goal is to choose the most efficient index or combination of indexes. This should minimize the total cost […]

In PostgreSQL, plans are implemented by using the query execution plan generated by the query optimizer. Aggregation and spool operations serve as key components in query plans, enabling efficient processing of aggregate queries. Let’s now […]