PostgreSQL

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PostgreSQL Internals

PostgreSQL Query Optimizer: Troubleshooting Unconsidered Hints

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 […]
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PostgreSQL Internals

How to have PostgreSQL execution plan with run-time?

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 […]
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PostgreSQL Performance

Adaptive Joins in PostgreSQL: Improving Query Performance

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 […]
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PostgreSQL Internals

How to implement Common Table Expressions in PostgreSQL?

Common Table Expressions (CTEs) provide a structured way to define temporary named result sets within a SQL statement in PostgreSQL. In particular, CTEs are useful for breaking down complex queries into smaller, more manageable parts. […]
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PostgreSQL Performance

When is memory allocated in PostgreSQL?

In PostgreSQL, the system allocates memory at various stages during query execution and other database operations. Below are key points where PostgreSQL allocates memory: It’s important to note that memory allocation in PostgreSQL is dynamic […]