https://github.com/claudioessilva/tsqlperformancetuning

Try to track down why your query is slow and get suggestions to fix it
https://github.com/claudioessilva/tsqlperformancetuning

Last synced: about 1 month ago
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Try to track down why your query is slow and get suggestions to fix it

• Host: GitHub
• URL: https://github.com/claudioessilva/tsqlperformancetuning
• Owner: ClaudioESSilva
• License: mit
• Created: 2023-08-25T11:24:58.000Z (over 1 year ago)
• Default Branch: main
• Last Pushed: 2024-09-21T14:40:23.000Z (3 months ago)
• Last Synced: 2024-10-12T13:07:37.330Z (2 months ago)
• Homepage:
• Size: 99.6 KB
• Stars: 11
• Watchers: 3
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Funding: .github/FUNDING.yml
  • License: LICENSE

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README

        
# T-SQL Performance Tuning

Try to find out why a query is slow and get suggestions to fix it.

## Flowcharts

In the [Flowcharts](./Flowcharts) directory you will find some "decision trees" built with mermaid. 

These flowcharts are meant to help you find a reason why your SQL Server query may have performance issues and suggest some ideas to fix it.

Mainly the suggestions will be around code re-write. 

## DISCLAIMER - Please read it: 

The suggestions made can be anywhere between, a harmless code change, to turning some "switch" on (for example: database scoped configurations). 

Keep in mind these can have other impacts.

Be sure you test these in a proper environment with a proper workload (when applicable) before you push these changes to production!

This isn't a silver bullet neither an exhaustive list of the existing options.  

There are many variables and combinations that will make cause different results.  

That said, these are high-level flowcharts that will try to guide you and may or not lead you to the possible cause and/or solution.

Hopefully, it will give you more ideas about where to look.

## Contributing

Have you found something missing? I'm sure you will find it!

Please open an "Issue" and let me know what you found, maybe a typo, maybe a missing example that you see every day and you would like to see unfold here.

NOTE: As of now, I'm not accepting PR (pull requests), as I'm not yet fixed to this way of visualizing the charts but, "Issues" are open and welcomed.

## Future plans

- Adding some demos

- Work on an "automatic" query analyzer to check if it's feasible for some scenarios