Optimize Your SQL Queries | Postgres Edition

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Easy way you can analyze and optimize your SQL queries to get the best performance out of them.

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0:00 Agenda
01:15 Difference between EXPLAIN & EXPLAIN ANALYZE
02:35 How count of returned rows affect performance
04:15 How to monitor index usage
10:30 Aggregation queries using indexes
13:37 Information about JOIN algorithms
18:15 ORDER BY using Index forward and backward
20:56 How to read query plans
22:10 Outro

#database #mysql #postgres
  1. Code with Irtiza
  2. database
  3. mysql
  4. postgres
  5. optimization
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Комментарии
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Just wanted to say thanks for this video! This was a great step by step breakdown and analysis.

xanthus
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Near 17:40, I think the volume table doesn’t have only one row. I think it decided to sequentially scan the volume table for each volume.volume_id will then match book.volume_id with each volume.volume_id. And for matching purposes, it is doing index scan as there is an index for book.volume_id. Sorry, I might be wrong. I didn’t understand how DBMS decided which table it will do the sequential scan first? Thanks for your video!

Rashidulhasan
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All of your videos are excellent. Thank you for the clear explanations and detailed examples. I hope you continue to create more videos for your channel!

DanielSposito
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Hi. Found your channel today and subscribed. Pretty good content here. Keep it up :D

luanlucas