How to trouble shoot the lag in the Django live server? - django

Question

I have a small protein database. You can see the codes here. Say a user searches for their proteins of interest from the database. They can add the sequences to the cart. Also, they can upload their custom data to the database using session. If the user clear the session their custom data will be removed. The purpose is to do additional analysis in the database (say pairwise alignments). The problem is when a user wants to clear session. After clearing the session still the html page shows the data. After ~60 seconds the session clears. I use anonymous sessions in the script.
The database works perfectly well locally. I couldn't figure out where the problem is. I tried both SQLite3 as well as PostgreSQL for the database. Still the problem persists.
"""
Django settings for database project.
Generated by 'django-admin startproject' using Django 2.2.5.
For more information on this file, see
https://docs.djangoproject.com/en/2.2/topics/settings/
For the full list of settings and their values, see
https://docs.djangoproject.com/en/2.2/ref/settings/
"""
import os, socket
# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/2.2/howto/deployment/checklist/
# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = '*******************************************'
# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = True
ALLOWED_HOSTS = ['*']
# Application definition
INSTALLED_APPS = [
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'database',
'captcha',
'crispy_forms',
]
MIDDLEWARE = [
'django.middleware.security.SecurityMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware',
]
ROOT_URLCONF = 'database.urls'
TEMPLATES = [
{
'BACKEND': 'django.template.backends.django.DjangoTemplates',
'DIRS': [os.path.join('templates')],
'APP_DIRS': True,
'OPTIONS': {
'context_processors': [
'django.template.context_processors.debug',
'django.template.context_processors.request',
'django.contrib.auth.context_processors.auth',
'django.contrib.messages.context_processors.messages',
],
},
},
]
WSGI_APPLICATION = 'database.wsgi.application'
# Database
# https://docs.djangoproject.com/en/2.2/ref/settings/#databases
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.sqlite3',
'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
}
}
# Password validation
# https://docs.djangoproject.com/en/2.2/ref/settings/#auth-password-validators
AUTH_PASSWORD_VALIDATORS = [
{
'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
},
{
'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
},
{
'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
},
{
'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
},
]
# Internationalization
# https://docs.djangoproject.com/en/2.2/topics/i18n/
LANGUAGE_CODE = 'en-us'
TIME_ZONE = 'UTC'
USE_I18N = True
USE_L10N = True
USE_TZ = True
# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/2.2/howto/static-files/
STATIC_URL = '/static/'
STATIC_ROOT = os.path.join(BASE_DIR, "static/")
MEDIA_ROOT = os.path.join(BASE_DIR, 'media/')
MEDIA_URL = "/media/"
CRISPY_TEMPLATE_PACK = 'bootstrap4'
PROJECT_DIR = os.path.dirname(__file__)
on_production_server = True if socket.gethostname() == '*****' else False
DEBUG = True if not on_production_server else False
TEMPLATE_DEBUG = DEBUG
The following versions are used installed
attrs==19.1.0
biopython==1.73
captcha==0.3
certifi==2019.9.11
chardet==3.0.4
colorclass==2.2.0
dj-database-url==0.5.0
Django==2.1
django-crispy-forms==1.7.2
django-tables2==2.1.0
docopt==0.6.2
ete3==3.1.1
numpy==1.16.4
packaging==19.1
Pillow==6.1.0
pip-upgrader==1.4.15
psycopg2==2.7.6.1
psycopg2-binary==2.7.6.1
pyparsing==2.4.2
PyQt5==5.13.0
PyQt5-sip==4.19.18
pytz==2019.2
requests==2.22.0
six==1.12.0
sqlparse==0.3.0
terminaltables==3.1.0
urllib3==1.25.3
uWSGI==2.0.17.1
whitenoise==4.1.3
I use NGINX and uWSGI for deployment in the Red Hat Enterprise Linux Server release 7.6 (Maipo). The data in the database is very small (700 protein sequences). There are no system admins in our department. Hence I am looking for the answer online. I am new to web development framework (Django) as well as deploying. How to identify and troubleshoot the problem? Can you point me where the problem could be?

Answer 1

The problem is not with Django. It's with nginx configuration file. Added the below line
location / {
add_header 'Cache-Control' 'no-store, no-cache,
must-revalidate, proxy-revalidate, max-age=0'; expires off; }
Referred: https://ryanclouser.com/2015/07/16/nginx-Disable-Caching/