DJANGO Session And Cache

Session settings

settings.py:

SESSION_COOKIE_AGE = 30 * 60              # Session time 30 minutes
SESSION_SAVE_EVERY_REQUEST = True         # Session time resets with every request
SESSION_EXPIRE_AT_BROWSER_CLOSE = False   # Session doesn't quit when browser clos

Session is stored per default in database - so a SESSION_SAVE_EVERY_REQUEST does a lot of additional database updates. Could be changed by using a cache like Redis

Using Cache

Installation

sudo apt redis-server
sudo systemctl enable --now redis-server
redis-cli ping

Configuration

settings.py:

CACHES = {
    "default": {
        "BACKEND": "django.core.cache.backends.dummy.DummyCache",
    },



    "sessions": {
        "BACKEND": "django.core.cache.backends.redis.RedisCache",
        "LOCATION": "redis://127.0.0.1:6379/1",
    },
}

SESSION_ENGINE = "django.contrib.sessions.backends.cache"
SESSION_CACHE_ALIAS = "sessions"

Because sessions are now only in the cache - a restart of the RedisCache would delete all sessions and everyone would get logged out immediately.

Using Cache and Database

SESSION_ENGINE = "django.contrib.sessions.backends.cached_db"

would write both to database and cache (so no help for the database)
only the reads would be buffered by the cache