SQL indexing best practices | How to make your database FASTER!

Learn about best practices for using indexes in SQL, and how they can be used to speed up your queries, make your database faster, and improve your application's performance.
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0:00 Intro
0:05 Example database table
0:15 Example query
0:21 The problem with a full table scan
0:50 Using EXPLAIN ANALYZE
1:04 What is a SQL index?
1:17 How to create a single-column index
1:37 How to create a multi-column index
2:08 Optimizing our SQL query
2:31 Caveats of sql indexes
Blog: www.cockroachlabs.com/blog/sq...
Docs: www.cockroachlabs.com/docs/st...
Free Course: university.cockroachlabs.com/...

[@drugofsweetness]

"When in doubt, explain" is what i loved about this video.

[@electrolyteorb]

Great video 🎉 you are just teaching Not only for CRDB but Sql dbs in general 👍

[@jeswer9]

Someone that talks sense. Great info!

[@WhiteSiroi]

thank you very much, very helpful

[@AnatolyLeonov]

Thanks! This was a nice enlightening explanation!

[@cockroachdb]

🤟

[@umabharathyts1998]

Thanks !

[@hasanmougharbel8030]

Hello man,
God bless your efforts.
I have a simple enquiry as a new sql learner.
How does the term b-tree relate to the index function in sql?
Thanks for taking care of this.

[@ExcelTutorials1]

Very helpful, thank you!

[@cockroachdb]

Thanks for watching!

[@MagicOfDark]

I had table without index took 18 hours to run, with index took like 6 minutes. Table had millions of entries. Also made some changes to my code, but that only shaved like 1-2 hours off.

[@Shujahaidergaming]

How it happens . It a alot of margin 6 hours and 6 minutes.
How much data in your table ?

[@abhay6276]

You didn't mention which index you created ? Clustered or non Clustered?😊

[@Deltacasper]

Would it not have been more efficient to create a separate table for the city column with additional information about the city such as region and country and reference that by Id and then index based on that instead and additionally have less redundant data or how?

[@michealraspberry4138]

correct. for data that repeat, what you suggested is the right solution. however, this is an example situation and they are trying to explain how indices are used.

[@teja6124]

Hi Sir, I have a table that consist of 16mil record and it will increase, weekly basis. to retrieve this table in Powerbi it is taking more time get this data from large SQL table. can you suggest any changes on the existing table ? current table doesn't have any indexes.

[@maryadebimpe9424]

Alter the table syntax an add the index

[@Nodsaibot]

oooooooor create a JSON with the cached results :D

[@jenweatherwax7113]

How many indexes should one add? And how do you know which columns to choose?

[@MatheusLB2009]

Maybe too late but indexes have to be unique (otherwise there is conflict) and preferably small as he said in the video. And if there is none, having a table mostly sorted by a specific column, like DateTime, naturally speeds up the query

[@victoriasingveena441]

Cool

[@cockroachdb]

We couldn't agree more.

[@user-sf8cs3sz2i]

Love this video HATE the name cockroach, disgusting

[@rainymornings]

I felt the same but honestly aren't they just insects like every other? I feel sad for the little critters now lol

[@user-sf8cs3sz2i]

@@rainymornings Appreciate your sentiment, still HATE roaches.