Postgres FM
Intro to query optimization
Sep 2, 2022
This podcast discusses query optimization in Postgres, including the use of 'explain' command, analyzing query performance, common mistakes in query optimization, and the impact of enabling timing on in Postgres. It also emphasizes the importance of query optimization on performance and invites listener engagement for future topics.
33:14
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Quick takeaways
- Understanding the distinction between macro and micro performance analysis is crucial in query optimization and requires analyzing the workload as a whole as well as focusing on single query optimization.
- Consideration of factors beyond what explain can reveal, such as CPU utilization and physical disk IO, is necessary for comprehensive query performance optimization.
Deep dives
Query Optimization: Macro vs Micro Performance Analysis
In this podcast episode, the hosts discuss the distinction between macro and micro performance analysis in query optimization. They emphasize the importance of understanding the difference between analyzing the workload as a whole and focusing on single query optimization. They discuss the utilization of tools like explain and explain analyze, which provide insights into query plans and execution data. The hosts highlight the limitations of these tools, such as the lack of information about CPU utilization and physical disk IO. They also mention the importance of considering parameters and statistics that influence the planner's decisions in query optimization.
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