caothi que

caothi que

1618889169

PostgreSQL Database Administration (DBA) for Beginners

In this post, we will go over the basics of the PostgreSQL. We will cover topics ranging from installations, to writing basic queries and retrieving data from tables. We will also explore the logic of joining tables to retrieve data and much more.

The course also covers the basics of creating tables, storing data with data types, and working with expressions, operators, and strings.

Topics also includes:

Installing PostgreSQL
Loading sample database
Creating database and tables
Performing CRUD operations
Joining Tables
Using aggregate and analytic functions
Creating views and triggers
What you’ll learn

Install PostgreSQL Server
Load sample database
Create a database
Create a table
Insert data into tables
Update existing records inside a table
Delete Records in a table
Remove duplicate records
Query data from a table
Create a subquery
Get data from multiple tables
Create and manage roles
Create a view
Create tablespace
Backup and restore database
Filter and sort data
Use various operators
Use aggregate and analytic functions
Create triggers

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PostgreSQL Database Administration (DBA) for Beginners
Ruth  Nabimanya

Ruth Nabimanya

1620633584

System Databases in SQL Server

Introduction

In SSMS, we many of may noticed System Databases under the Database Folder. But how many of us knows its purpose?. In this article lets discuss about the System Databases in SQL Server.

System Database

Fig. 1 System Databases

There are five system databases, these databases are created while installing SQL Server.

  • Master
  • Model
  • MSDB
  • Tempdb
  • Resource
Master
  • This database contains all the System level Information in SQL Server. The Information in form of Meta data.
  • Because of this master database, we are able to access the SQL Server (On premise SQL Server)
Model
  • This database is used as a template for new databases.
  • Whenever a new database is created, initially a copy of model database is what created as new database.
MSDB
  • This database is where a service called SQL Server Agent stores its data.
  • SQL server Agent is in charge of automation, which includes entities such as jobs, schedules, and alerts.
TempDB
  • The Tempdb is where SQL Server stores temporary data such as work tables, sort space, row versioning information and etc.
  • User can create their own version of temporary tables and those are stored in Tempdb.
  • But this database is destroyed and recreated every time when we restart the instance of SQL Server.
Resource
  • The resource database is a hidden, read only database that holds the definitions of all system objects.
  • When we query system object in a database, they appear to reside in the sys schema of the local database, but in actually their definitions reside in the resource db.

#sql server #master system database #model system database #msdb system database #sql server system databases #ssms #system database #system databases in sql server #tempdb system database

Django-allauth: A simple Boilerplate to Setup Authentication

Django-Authentication 

A simple Boilerplate to Setup Authentication using Django-allauth, with a custom template for login and registration using django-crispy-forms.

Getting Started

Prerequisites

  • Python 3.8.6 or higher

Project setup

# clone the repo
$ git clone https://github.com/yezz123/Django-Authentication

# move to the project folder
$ cd Django-Authentication

Creating virtual environment

  • Create a virtual environment for this project:
# creating pipenv environment for python 3
$ virtualenv venv

# activating the pipenv environment
$ cd venv/bin #windows environment you activate from Scripts folder

# if you have multiple python 3 versions installed then
$ source ./activate

Configured Enviromment

Environment variables

SECRET_KEY = #random string
DEBUG = #True or False
ALLOWED_HOSTS = #localhost
DATABASE_NAME = #database name (You can just use the default if you want to use SQLite)
DATABASE_USER = #database user for postgres
DATABASE_PASSWORD = #database password for postgres
DATABASE_HOST = #database host for postgres
DATABASE_PORT = #database port for postgres
ACCOUNT_EMAIL_VERIFICATION = #mandatory or optional
EMAIL_BACKEND = #email backend
EMAIL_HOST = #email host
EMAIL_HOST_PASSWORD = #email host password
EMAIL_USE_TLS = # if your email use tls
EMAIL_PORT = #email port

change all the environment variables in the .env.sample and don't forget to rename it to .env.

Run the project

After Setup the environment, you can run the project using the Makefile provided in the project folder.

help:
 @echo "Targets:"
 @echo "    make install" #install requirements
 @echo "    make makemigrations" #prepare migrations
 @echo "    make migrations" #migrate database
 @echo "    make createsuperuser" #create superuser
 @echo "    make run_server" #run the server
 @echo "    make lint" #lint the code using black
 @echo "    make test" #run the tests using Pytest

Preconfigured Packages

Includes preconfigured packages to kick start Django-Authentication by just setting appropriate configuration.

PackageUsage
django-allauthIntegrated set of Django applications addressing authentication, registration, account management as well as 3rd party (social) account authentication.
django-crispy-formsdjango-crispy-forms provides you with a crispy filter and {% crispy %} tag that will let you control the rendering behavior of your Django forms in a very elegant and DRY way.

Contributing

  • Django-Authentication is a simple project, so you can contribute to it by just adding your code to the project to improve it.
  • If you have any questions, please feel free to open an issue or create a pull request.

Download Details:
Author: yezz123
Source Code: https://github.com/yezz123/Django-Authentication
License: MIT License

#django #python 

sneha cynix

1588143356

How to become a SQL DBA: Database Administrator

Database Administration consists of everything essential for managing a database. This makes it
accessible as per your need. The DBA is the person who maintains, backs up and ensures the data
generation and consumption. You can access them by today's organizations through their IT systems.
The DBA plays a vital role in many of today's IT agencies, and by extension, their organizations as a
whole.

Consider, for example of a commercial bank. The DBA is the person who ensures that the bank teller
has fast, simple access to your records. Therefore you can access your bank balance and transaction
history easily. For this case, the DBA is an application database administrator and a general SQL DBA
position. This is responsible for most aspects of the databases of the organization. It isn’t the only form
of SQL DBA though. In this article let us go through duties and specializations of SQL DBA training

Duties of SQL DBA administrator
The duties of a database administrator can include:
Installing and updating the database server and or application software.
Planning and allocating the physical requirements of the database system. The activities include memory, storage space, network requirements, and so on. Modifying the database configuration using input provided by application developers.

Creating user profiles, and maintaining device protection by conscientious user permissions allocation.
Ensure compliance with the vendor license agreement for the database. This includes a number of installations, and takes care of licensing renewals.
Create a database backup and recovery strategy. Then test the backups regularly to ensure usability.
Monitoring technological support for all database systems and software related to these.
Generates reports by querying from the database as required. These reports can take the form of pre-formatted reports using the application frontend. Besides includes database administrator’s custom-made ad hoc reports.
Track and improve the performance of the database. You can either use manual or automated methods. This may be the most critical duties of a SQL DBA.

Migration of database instances into new hardware and software models. This is from premise to cloud-based applications, and vice versa.
Now that you have read about the duties let us go through different specializations a SQL DBA can acquire.

SQL Database administrator specializations
The term ‘doctor’ may refer to a wide range of specializations. Similarly the position of database administrator often includes a wide range of sub-specializations. The SQL DBA mentioned is the most popular one. It is the one who works for a company in-house or on contract. This helps to keep its internal databases chugging along optimally. The various SQL DBA jobs specializations are as follows.

Database designers
There are also database managers who mainly build and construct databases. They work as part of a team, often in a software development company with more speciality. The database would be part of a larger framework for some particular business needs. In the commercial bank example earlier, the bank most likely buys or leases the software.
This is from an information communication and technology (ICT) firm. The firm specializes in banking software to operate its banking operations. Backed by a database, which is the backend storage for all the data, develop this banking software. You may build this by a team of professional SQL DBAs (more aptly called ‘database designers’). They work with business analysts and others who are familiar with banking operations. This is to develop functions and modules for the different applications. This is to ensure that all bank functions you create reflect in the database structure.

Quality SQL DBA or Tuning SQL DBA:
It is another type of database administrator. You may use this administrator in the optimization and enhancement of the performance. Databases parts of complex software. Simply put, the internal structure of a database and compose of data contained in tables. Using indexes which read like the table of contents of a book can then optimize data access. SQL DBAs help make sure to make a design for the database to take advantage of the physical or virtual hardware.

This means that you need to be able to spread data between multiple disks. Therefore it allows the database to allow better use of the memory or RAM. Besides it manages remote database network traffic. In ‘distributed setups,’ some databases split from multiple servers. Some databases may get so complex. Therefore they require a SQL DBA that focuses solely on improving performance. However, a non-specialist SQL DBA is commonly enough for smaller, single-company databases. for more SQL server dba online course

Application SQL DBA
A third category of database administrator is Application SQL DBA. Specifically, this function focuses on incorporating databases into the applications using them. Browsing most databases needs typically knowledge of a particular type of query language. The Organized Query Language, or SQL, is the most popular. Most users won’t learn how to use and navigate SQL.
Instead, they’ll use a front-end program to perform their required tasks. In a commercial bank, this application is the banking program itself . It is the SQL DBA job to ensure proper contact between the database and the programmer. SQL DBA uses it, and you may share reliable results between the two. For example, the database returns the correct amount and not.

Path to become a SQL DBA

There are two key paths to becoming a database administrator.
Focusing on becoming a SQL DBA from the start of an IT career or
Starting in a general ICT field, such as support or growth from the helpdesk, and slowly becoming more skilled in database management.
Either way, being a professional database administrator won’t occur overnight. You first need to learn other skills that are also important in most ICT careers.

SQL DBA Skills:

The important skills for a SQL DBA are as follows.
Excellent troubleshooting skills
When faced with a question, particularly one you haven’t seen before, the ability to think through the possible causes and then remove or logically follow them to the end is absolute. A successful SQL DBA is one who can see a mistake, and then quickly find potential causes and create possible solutions.

Logical thinking, common sense and above-average memory:

It is also important to have the natural ability to think methodically using an elimination-based approach coupled with a good memory. This includes the ability to remember technical information about various systems and technologies that are important to your configuration, such as how to increase the size of a table in your SQL Server database, how to connect a new disk to your Linux server and how to remove a user in your PostgreSQL database. Similarly, bearing in mind some basic details about your particular environment (Do you work in a LAN or WAN? What are the passwords of the database administrators? How many users do you have? When is your next audit of the database? Where are your backups stored?) is essential.

Curiosity and a deep desire to learn:

Curiosity and ambition should help ensure that your career as a database administrator doesn’t stagnate. The nature of IT is constantly changing — only the desire and appetite to keep learning new things can keep you from going backwards.

Conclusion:

It is a good idea to have one or more commercial database systems approved. Most organizations should concentrate on recruiting people with qualifications and SQL DBA training in the applications that they use similar database. You can always go for SQL server dba training for getting expertise in the topic.

#sql server dba online course #sql dba online course #sql dba training #sql dba course #sql server dba course

Poppy Cooke

Poppy Cooke

1561173960

PostgreSQL Database Administration (DBA) for Beginners - Full Course

In this video, we will go over the basics of the PostgreSQL. We will cover topics ranging from installations, to writing basic queries and retrieving data from tables. We will also explore the logic of joining tables to retrieve data and much more.

The course also covers the basics of creating tables, storing data with data types, and working with expressions,  operators, and strings.

What you’ll learn:

  •    Install PostgreSQL Server
  •    Load sample database
  •    Create a database
  •    Create a table
  •    Insert data into tables
  •    Update existing records inside a table
  •    Delete Records in a table
  •    Remove duplicate records
  •    Query data from a table
  •    Create a subquery
  •    Get data from multiple tables
  •    Create and manage roles
  •    Create a view
  •    Create tablespace
  •    Backup and restore database
  •    Filter and sort data
  •    Use various operators
  •    Use aggregate and analytic functions
  •    Create triggers

#postgresql #database #sql 

Loma  Baumbach

Loma Baumbach

1595774031

ScaleGrid DigitalOcean Support for MySQL, PostgreSQL and Redis™

PALO ALTO, Calif., June 9, 2020 – ScaleGrid, a leading Database-as-a-Service (DBaaS) provider, has just announced support for their MySQLPostgreSQL and Redis™ solutions on DigitalOcean. This launch is in addition to their current DigitalOcean offering for MongoDB® database, the only DBaaS to support this database on DigitalOcean.

MySQL and PostgreSQL are the top two open source relational databases in the world, and Redis is the top key-value database. These databases are a natural fit for the developer market that has gravitated towards DigitalOcean since its launch just nine years ago in 2011. The open source model is not only popular with the developer market, but also enterprise companies looking to modernize their infrastructure and reduce spend.  DigitalOcean instance costs are also over 28% less expensive than AWS, and over 26% less than Azure, providing significant savings for companies who are struggling in this global climate.

ScaleGrid’s MySQL, PostgreSQL and Redis™ solutions on DigitalOcean are competitively priced starting at just $15/GB, the same as DigitalOcean’s Managed Database solution, but offer on average 30% more storage for the same price. Additionally, ScaleGrid offers several competitive advantages such as full superuser access, custom master-slave configurations, and advanced slow query analysis and monitoring capabilities through their sophisticated platform. To compare more features, check out their ScaleGrid vs. DigitalOcean MySQLScaleGrid vs. DigitalOcean PostgreSQL and ScaleGrid vs. DigitalOcean Redis™ pages.

#cloud #database #developer #digital ocean #mysql #postgresql #redis #scalegrid #advanced performance #database infrastructure #dbaas on digitalocean #digitalocean customers #digitalocean instance costs #digitalocean managed databases #high performance ssd #mysql digitalocean #postgresql digitalocean #redis digitalocean #scalegrid digitalocean #scalegrid vs. digitalocean