Django db_index=true

When we should use db_index=True in Django?

This is not really django specific; more to do with databases. You add indexes on columns when you want to speed up searches on that column.

Typically, only the primary key is indexed by the database. This means look ups using the primary key are optimized.

If you do a lot of lookups on a secondary column, consider adding an index to that column to speed things up
I would say you should use db_index=True when you have a field that is unique for more useful lookups.

For example if you a table customers with records of many users they'll each have their own unique user_id. 
Each user_id would be unique and having to index this field to find that unique user is more often desirable than say their first_name or last_name.
Actually this is also ok but since they're not unique you will get probably recieve multiple results from your queries and this might not be as useful as using an referencing their id.

Similar codes

0 vote406 views2 answers
Update a package with pip in django
Python Django
1 vote375 views2 answers
Django template iterate dict
Python Django
1 vote367 views1 answer
Django filter after annotate
Python Django
0 vote381 views1 answer
Extends template django
Python Django
-1 vote351 views2 answers
Django cleanup
Python Django
0 vote344 views1 answer
Django retrieveupdatedestroyapiview
Python Django
0 vote371 views1 answer
Django create token for user
Python Django
0 vote388 views1 answer
How to get session value in django template
Python Django
0 vote346 views2 answers
Deploy django with nginx and gunicorn
Python Django
1 vote326 views3 answers
Django logout user
Python Django