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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 […]

PostgreSQL Query Optimization: Revealing SQL Plan Directive Details

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. […]

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 […]

How PostgreSQL Optimizer selects which indexes to use?

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 […]

How to implement Plans in PostgreSQL with aggregation and spools?

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 […]

How to implement User-Defined Functions(UDF) in PostgreSQL?

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. […]

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 […]

PostgreSQL work_mem Tuning – Optimize Sort Performance by Controlling Block Reads

Tuning work_mem to dictate the number of blocks that a process can read from a single sort run in one read in PostgreSQL In PostgreSQL, the work_mem configuration parameter controls how many blocks a process […]

How Many Access Paths are Available to the PostgreSQL Optimizer?

In PostgreSQL, the query optimizer has several access paths at its disposal to determine the most efficient way to access and retrieve data from tables or indexes. The choice of access path depends on factors […]

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