POSTGRESQL CHEAT SHEET

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PostgreSQL - Architecture

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When you start PostgreSQL`s instance (via pg_ctl start) the main process of the databases is started. In the past versions it was known as the postmaster process and now days it is called postgres. When this processes is started it allocates memory for two main things : shared memory and other background processes. The shared memory is a memory that the database uses mainly for cashing. Its main goal is to reduce the I/O operations and as a result of that improve the performance of the database. The other processes that the postgres process starts are responsible for the ongoing work of the database.  PostgreSQL`s architecture is based on a client/server communication. In the server side there is a server process that manages the files, database operations, connection and so on.. On the client side there is a tool/program which can be a graphical tool (gui)  like pgAdmin or a command line tool(cli) like psql  that is repnsible for connection the database and allowing the user
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PostgreSQL - Backup & Point In Time Recovery

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  In this post you will learn about how to restore a PostgreSQL database in Point in time. Open source databases are taking over other conventional Database softwares at very high speed. For me personally, I really like the way PostgreSQL is designed and it’s simple architecture. I have tried to write it down every possible steps which will help you to restore your Postgres database. Below Steps will be same, but few commands may vary with any other backup tool. PITR PostgreSQL Allow you to restore database to a specific moment in time PITR. It make use of live database files and WAL files. This method can only backup and restore the whole cluster, for individual database use pg_dump. It can be done when the DB is online. Step 1. If archive logs not enable then enable it, otherwise go to Step3. Create Directory for archive logs mkdir /postgres/postgres12.2/wal_archives Make changes in postgresql.conf Postgresql.conf is present under your data directory, in my case it is in /postgres/po
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Installing pgbadger on Linux for PostgreSQL log analysis

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As a DBA, we often encounter scenarios when you need to track PostgreSQL database performance by analyzing workloads and identify bottlenecks if any. There comes  pgbadger  – an open source log analyzer for PostgreSQL. It parse the PostgreSQL log files and gives you a nice overview of the PostgreSQL cluster including various query metrics like number of query executions, their types and duration, session details, Locks statistics, warnings, errors and other event patterns etc. All of these details will be available in a nice HTML format on your web browser. Installation: Prerequisite: The  pgbadger  is written in pure  Perl  and uses a JavaScript library ( flotr2 ) to draw graphs. Hence, you need to ensure that a modern Perl distribution is available in your system. Charts are rendered using a JavaScript library and Your web browser will do all the work. Nothing additional is required here. Use the below command to install  perl  if it is not already installed in your system. $ yum ins
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