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

-2 votes333 views2 answers
Django form date picker
Python Django
-2 votes320 views4 answers
Django datepicker
Python Django
0 vote322 views2 answers
MultiValueDictKeyError django
Python Django
0 vote297 views1 answer
Django created at field
Python Django
0 vote338 views2 answers
Allow x_frame_options django
Python Django
1 vote335 views1 answer
Db_index django
Python Django
0 vote369 views1 answer
Creating base models django
Python Django
0 vote333 views1 answer
Bulk upload with dictionary or list in django moels
Python Django
1 vote311 views1 answer
Django get id of newly created object
Python Django
1 vote334 views1 answer
Django filter after annotate
Python Django