Django Query extremely slow Django Query extremely slow database database

Django Query extremely slow


You should try and first isolate the problem. Run manage.py shell and run the following:

scope = Scope.objects.get(pk='Esoterik I')print scope

Now django queries are not executed until they very much have to. That is to say, if you're experiencing slowness after the first line, the problem is somewhere in the creation of the query which would suggest problems with the object manager. The next step would be to try and execute raw SQL through django, and make sure the problem is really with the manager and not a bug in django in general.

If you're experiencing slowness with the second line, the problem is eitherwith the actual execution of the query, or with the display\printing of the data. You can force-execute the query without printing it (check the documentation) to find out which one it is.

That's as far as I understand but I think the best way to solve this is to break the process down to different parts and finding out which part is the one causing the slowness


For being sure about the database execution time, it is better to test queries generated by Django since Django-generated queries may not be a simple SELECT * from blah blah

To see the Django generated query:

_somedata = Scope.objects.filter(pk='Esoterik I') # you must use filter in hereprint somedata.query.__format__('')

This will display you the complete query generated by Django. Then copy it and open a Postgresql console and use Postgresql analyze tools:

EXPLAIN ANALYZE <your django query here>;

like:

EXPLAIN ANALYZE SELECT * FROMsomeapp_scope WHERE id = 'Esoterik I';

EXPLAIN will show average execution data while ANAYLZE will also show you some extra data about execution time of that analyze.

You can also see if any index is used by postgresql during query execution in those analyze results.