PostgreSQL Performance

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PostgreSQL Internals

PostgreSQL Reduce WAL: Increasing Checkpoint Distance

In PostgreSQL, the WAL (Write-Ahead Logging) is a critical component of the database system that ensures durability and consistency of data. However, frequent WAL writes can impact the performance of the database, especially if the […]
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PostgreSQL Performance

PostgreSQL Slow Query: How to Compute Its Cost

The cost of a slow query in PostgreSQL can be estimated by the Query Planner, which uses statistics about the data in the tables being queried to make predictions about the query execution time. The […]
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PostgreSQL Performance

PostgreSQL Global Indexes: How They Are Implemented

In PostgreSQL, global indexes are implemented using a shared-nothing architecture, which means that the index data is partitioned and distributed across multiple physical nodes or “shards.” This allows for parallel query processing and improved performance […]
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PostgreSQL Performance

PostgreSQL Process Global Area: Tuning Guide

In PostgreSQL, the process global area (PGA) is managed by the server’s memory allocator and is used to store data structures associated with each client’s session, such as query plans and sorts. To tune the […]
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PostgreSQL Internals

PostgreSQL COMMIT: What It Does Internally

In PostgreSQL, a COMMIT statement is used to finalize a transaction and make its changes permanent in the database. When a COMMIT statement is executed, the following things happen internally in PostgreSQL: After a transaction […]
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PostgreSQL Internals

PostgreSQL Latches: How They Are Implemented

PostgreSQL uses latches to provide synchronization between different threads accessing shared resources. Latches are lightweight and efficient mechanisms that provide mutual exclusion between threads. Here is a table describing all the PostgreSQL latches, their purpose, […]