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 vote179 views2 answers
How to remove zero after decimal float python
Python
38 votes173 views3 answers
Python print datetime
Python
0 vote160 views1 answer
Lllll
Python
1 vote171 views1 answer
How to send json in django response
Python
3 votes162 views3 answers
Python pip not working
Python
1 vote173 views1 answer
How to sort dict by value
Python
1 vote182 views1 answer
Draw a circle in python turtle
Python
9 votes182 views2 answers
How to connecct id's in the models of jdango
Python
6 votes173 views2 answers
Python 2d array append
Python
1 vote157 views1 answer
Keyboardpython
Python