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

1 vote141 views3 answers
Management commands django
Python Django
0 vote73 views1 answer
Django creat app return _bootstrap._gcd_import
Python Django
0 vote132 views1 answer
MULTIPLE Model Search in Django rest framework
Python Django
0 vote130 views1 answer
Visitor IP address django
Python Django
0 vote136 views1 answer
Reverse relationship in django for one to one field for usage in Django rest serializer
Python Django
1 vote130 views1 answer
Django gunicorn static file not found
Python Django
0 vote126 views1 answer
How to get a mock image in django?
Python Django
1 vote136 views1 answer
Number of database queries django
Python Django
1 vote149 views1 answer
Django return only part of string
Python Django
0 vote134 views1 answer
Adding bootstrap grid dynamically django
Python Django