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 vote137 views1 answer
Sprints for fat loss
Python
0 vote135 views1 answer
Missingno python
Python
0 vote142 views1 answer
How to make text bold in tkinter
Python
0 vote136 views1 answer
Bulk m4a to wav ffmepeg
Python
2 votes154 views1 answer
Python how to unnest a nested list
Python
1 vote130 views1 answer
Pandas merge dataframes from a list
Python
0 vote141 views1 answer
Python split paragraph
Python
1 vote136 views2 answers
Max float python
Python
35 votes141 views5 answers
Drop column with nan values
Python
0 vote128 views1 answer
Tensorflow create custom initializer
Python