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 votes188 views2 answers
Formula of factorial
Python
7 votes213 views1 answer
Np in python
Python
1 vote179 views1 answer
Python making player equipment
Python
0 vote204 views1 answer
Write a python program to find the most frequent word in text file
Python
0 vote183 views1 answer
Python class overwrite length method
Python
0 vote196 views1 answer
Max sum slice python 1 - autopilot
Python
0 vote262 views1 answer
Enumerate in django templte
Python Django
1 vote189 views3 answers
Python sort list by custom function
Python
1 vote201 views2 answers
Perfect number program in python
Python
2 votes192 views2 answers
How to find the longest string in a list in python
Python