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 vote191 views1 answer
Django import settings variables
Python Django
0 vote141 views1 answer
Validationerror django params
Python Django
-1 vote128 views3 answers
Raw sql query to django converter
Python Django
0 vote127 views1 answer
How to add new column in django
Python Django
2 votes139 views1 answer
Django register models
Python Django
0 vote161 views1 answer
How to log errors while debug is false in django
Python Django
-1 vote137 views1 answer
Django custom primary key field
Python Django
0 vote141 views1 answer
Django generate openapi schema command line
Python Django
14 votes140 views5 answers
How to create requirements.txt django
Python Django
0 vote128 views1 answer
Create and add many to many field in django
Python Django