atomos / django-admin-approx-count

A dirty mixin to rescue from dumb `count(*)` query of Django admin

django-admin-approx-count

A dirty mixin to rescue from dumb count(*) query of Django admin

What is this for?

Django admin works well with less set of rows.

But it slows down on large database system - every single list page of admin needs SELECT COUNT(*) FROM TABLE query to calculate the count of rows. And this causes severe performance issues on production system.

We don't really want to know EXACT count of rows. Right? Then use this.

See this Stackoverflow question

Installation

pip install django-admin-approx-count

or, download / clone from source repo

Usage

Use shipped mixins in your admin.py.

from django.contrib import admin
from approx_count.mixin import MaxIdAdminMixin, TableStatusAdminMixin

class SomeAdmin(MaxIdAdminMixin, admin.ModelAdmin):
    ...

class AnotherAdmin(TableStatusAdminMixin, admin.ModelAdmin):
    ...

Or, with admin classes.

from approx_count.admin import MaxIdModelAdmin, TableStatusModelAdmin

class SomeAdmin(MaxIdModelAdmin):
    ...

class AnotherAdmin(TableStatusModelAdmin):
    ...

Mixins

Default django queryset uses SELECT COUNT(*) FROM TABLE to calculate row count. However,

• MaxIdAdminMixin uses SELECT MAX(ID) FROM TABLE.
• TableStatusAdminMixin uses table status / information.

Note

• For MySQL, by Nova
  • http://stackoverflow.com/a/10446271/366908
• For Postgres, by Woody Anderson
  • http://stackoverflow.com/a/23118765/366908

Author

Park Hyunwoo(@lqez)

License

django-admin-approx-count is distributed under MIT license.