Commit 3d46f315 authored by Yorick Peterse's avatar Yorick Peterse

Add documentation about reading query plans

This adds a database guide on how to read the output of "EXPLAIN" and
"EXPLAIN ANALYZE", and how to use this output to understand a query's
performance and optimise it.
parent e610b41e
...@@ -55,7 +55,13 @@ description: 'Learn how to contribute to GitLab.' ...@@ -55,7 +55,13 @@ description: 'Learn how to contribute to GitLab.'
- [Merge request performance guidelines](merge_request_performance_guidelines.md) - [Merge request performance guidelines](merge_request_performance_guidelines.md)
for ensuring merge requests do not negatively impact GitLab performance for ensuring merge requests do not negatively impact GitLab performance
## Databases guides ## Database guides
### Tooling
- [Understanding EXPLAIN plans](understanding_explain_plans.md)
- [explain.depesz.com](https://explain.depesz.com/) for visualising the output
of `EXPLAIN`
### Migrations ### Migrations
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