Postgres Tutorials
How to solve common and tricky Postgres issues covering Go, Python, Java, Dockers, Kubernetes, Django, and other technologies
Recent Tutorials
pg_catcheck: How to diagnose system catalog corruption due to missing or inaccessible relation file in PostgreSQL
August 7, 2020
This article introduces a new functionality for the EnterpriseDB tool pg_catcheck that can help detect missing or inaccessible relation files that cause “could not open file” errors. pg_catcheck New pg_catcheck relation functionality When your database throws an error like "could not open file base...
Creating a dblink from Oracle to PostgreSQL
June 29, 2020
This article shows how to create a dblink connection from Oracle to EDB Postgres Advanced Server or PostgreSQL, Installation Connection Testing connectivity There are several reasons where we might need to use both Oracle and PostgreSQL databases in a business environment. One common scenario is to...
How to Deploy Ansible Scripts for the EDB Postgres Platform
June 23, 2020
Then, Ansible scripts were used for configuration setup of the Postgres database and tools like EDB Failover Manager (EFM) for high availability, Postgres Enterprise Manager (PEM) for monitoring the Postgres cluster, and EDB Backup and Recovery Tool (BART) for maintaining the backups.
Porting between Oracle and PostgreSQL
June 22, 2020
This article discusses the possible complications that can arise when migrating databases from Oracle to PostgreSQL. The steps for migration are covered and issues and their fixes are identified: Approach to migration Schema migration Code migration Data migration When migrating database objects...
How to Monitor PostgreSQL Connections
June 20, 2020
This article discusses connections to PostgreSQL database servers. It first reviews the possible states for a connection and then shows how to identify and terminate connections that are lying idle and consuming resources. States of a connection Identifying the connection states and duration...
Trying on Many Hats: How to improve OLAP workload performance for PostgreSQL
June 14, 2020
This article offers tips for improving Online Analytical Processing (OLAP) performance for PostgreSQL. Sizing up the Situation Schema Planning Database Tuning Hardware Selection As the world’s most advanced open-source database, PostgreSQL is very versatile. With applications ranging from embedded...
How to deploy PostgreSQL along with Monitoring and high availability tools on VMware vSphere using Terraform
May 14, 2020
This article outlines the steps for creating and configuring EDB Postgres on VMware vSphere using Terraform with deployment scripts available on GitHub.
How to Tune PostgreSQL GUC Parameters
May 5, 2020
This article discusses GUC parameters that can be used for PostgreSQL tuning and how to configure them for improved performance.
Interval Partitioning in EDB Postgres Advanced Server: Auto-create a new partition when inserted data exceeds the range
May 5, 2020
EDB Postgres Advanced Server v12 (EPAS) introduces the Interval Partitioning feature. Interval partitioning allows a database to automatically create a new partition when newly inserted data exceeds the range of an existing partition.
How to replace Postgres Enterprise Manager self-signed certificates with certificates provided by Certificate Authority (CA)
May 5, 2020
This article provides instructions for how to replace self-signed certificates for Postgres Enterprise Manager with authorized certificates issued by Certificate Authority.
PostgreSQL Automatic Failover Replication Tutorial
April 30, 2020
Replication is when data is copied from one database server to another. The source database server is usually called the Master server, whereas the database server receiving the copied data is called the Replica server.
Redefining triggers: Compound Triggers in EDB Postgres Advanced Server
April 29, 2020
Are you bored with writing multiple triggers? Do you want the ability to share details between the various triggers’ timing points for the same table? Let's use the compound triggers feature added in EDB Postgres Advanced Server 12 (EPAS 12).
Extending PostgreSQL Monitoring in Postgres Enterprise Manager by Creating Custom Probes
April 24, 2020
This article defines a probe and provides instructions for creating custom probes for PostgreSQL using EDB Postgres Enterprise Manager (PEM).
What is Parallel Vacuum in PostgreSQL 13
April 17, 2020
In PostgreSQL, we already support parallelism of a SQL query which leverages multiple cores to execute the query faster. Vacuum is one of the most critical utility operations which helps in controlling bloat, one of the major problems for PostgreSQL DBAs. So, vacuum needs to run really fast to reduce the bloat as early as possible. In PG13, parallel vacuum is introduced which allows for parallel vacuuming of multiple indexes corresponding to a single table.
Why Django is so impressive for developing with PostgreSQL and Python
April 15, 2020
This post gives you a brief idea about why you should use PostgreSQL as a backend database with Django. It also describes how to use it and the benefits of using PostgreSQL with Django.
What is Multi-column Partitioning in PostgreSQL and How Pruning Occurs
April 8, 2020
This article covers how to create a multi-column partitioned table and how pruning occurs in such cases.
PostgreSQL query tuning checklist
April 6, 2020
This article offers a checklist of tools available for improving PostgreSQL query performance.
How to tune PostgreSQL for memory
April 6, 2020
This article looks at parameters that can be used to help manage memory in PostgreSQL. Recommended settings for each parameter are also provided.
How to use table partitioning to scale PostgreSQL
March 25, 2020
This article discusses table partitions, the benefits of using them to increase performance, and the types of partitions that can be used in PostgreSQL.
How to make queries faster with multicolumn indexes
March 25, 2020
This article introduces multicolumn indexes and explains how they can by used to make large queries run faster.
How to implement faceted search with Django and PostgreSQL
March 24, 2020
This article discusses the advantages of faceted search and how to create a faceted search using Django and PostgreSQL.
How does PostgreSQL master-replica failover work?
March 24, 2020
This article looks at the processes involved in master-replica failover in PostgreSQL and the options and commands that are available for configuring it.
How to load a sample database with schemas and data in PostgreSQL
March 23, 2020
This article discusses how to make a backup of a database using pg_dump in PostgreSQL and provides examples of how to make and restore the backups in different formats.
How to implement repmgr for PostgreSQL automatic failover
March 23, 2020
This article discusses the open source tool repmgr (Replication Manager) and how to set up and configure it for automatic failover in PostgreSQL.
How to Migrate Oracle's UNPIVOT to PostgreSQL
March 23, 2020
This article looks at the UNPIVOT function in Oracle and how to reproduce its result using PostgreSQL.
How to test unlogged tables for performance in PostgreSQL
March 19, 2020
This article looks at unlogged tables in PostgreSQL and reviews performance differences between unlogged tables and ordinary and temporary tables, as well as crash recovery.
How to deploy PostgreSQL and EDB Postgres Platform on AWS using Terraform automation scripts
March 19, 2020
With these deployment scripts, you can set up the PostgreSQL database of your choice (PG/EDB Postgres), and, in addition, the scripts will deploy and configure the tools that would take care of high availability and automatic failover and also set up monitoring for the PostgreSQL cluster. We will use Terraform automation scripts to achieve this and deploy the cluster on AWS.
How to convert Oracle Blobs to PostgreSQL
March 18, 2020
This article discusses binary large objects (Blobs) in Oracle and how to convert them into formats that PostgreSQL is able to use.
How to easily convert Oracle procedures to PostgreSQL
March 5, 2020
This article gives five examples of converting procedures from Oracle’s PL/SQL procedural language into PostgreSQL’s PL/pgSQL language.
How to import data from Oracle into PostgreSQL
March 5, 2020
This article provides three methods for importing data from an Oracle database into PostgreSQL.
Strategy for migrating partitioned Oracle database tables to PostgreSQL
March 5, 2020
This article highlights differences in table partitioning between Oracle and PostgreSQL and provides key points to consider before migration partitioned data between them.
How to configure heterogeneous connections from Oracle to PostgreSQL
March 3, 2020
This article discusses heterogeneous connections and how to set up a connection from Oracle to PostgreSQL using one.
Partitioning commands in PostgreSQL compatible with Oracle databases
March 3, 2020
This article provides information about the types and benefits of table partitioning and using the table partitioning syntax compatible with Oracle databases supported by EDB’s Advanced Server (EDB’s Postgres database).
Accessing PostgreSQL databases using psqlODBC in Oracle
February 21, 2020
This article demonstrates how to use the PostgreSQL client interface psqlODBC driver in Oracle to access PostgreSQL data.
How to quickly build an API using Node.js & PostgreSQL
February 20, 2020
This article describes how you can use Node.js and PostgreSQL to create an API and provides an example for how to create a table.
Connecting to PostgreSQL using PHP
February 19, 2020
This article reviews the steps necessary for connecting to a PostgreSQL database using PHP.
How to use clauses when querying data (FROM, WHERE, GROUP BY, HAVING, BETWEEN, LIKE, FETCH)
February 19, 2020
This article discusses the use of clauses in PostgreSQL queries to filter and organize data in results. It introduces different clauses and provides examples of their usage.
How to call PostgreSQL stored procedures from a PHP application
February 19, 2020
This tutorial provides instructions and an example for calling a PostgreSQL stored procedure from a PHP application.
How to work with Blobs when using PostgreSQL and PHP
February 19, 2020
This tutorial provides instructions and an example for converting large files like images into binary large objects (blobs) that can be stored in a PostgreSQL database using PHP.
pgAdmin, a comparable tool to PL/SQL Developer for PostgreSQL
February 19, 2020
This article explains how to get started using pgAdmin 4 as a management tool for PostgreSQL.
How to work with control structures in PostgreSQL stored procedures: Using IF, CASE, and LOOP statements
February 12, 2020
This article reviews control structures that can be used in PostgreSQL stored procedures, with syntax and examples provided for each.
How NULL and empty strings are treated in PostgreSQL vs Oracle
February 12, 2020
This article discusses the differences between how Oracle and PostgreSQL evaluate NULL characters and empty strings. Oracle reads empty strings as NULLs, while PostgreSQL treats them as empty. Concatenating NULL values with non-NULL characters results in that character in Oracle, but NULL in PostgreSQL.
How to run Postgres in Oracle compatibility mode
February 12, 2020
This article discusses the advantages of the Oracle compatibility features in EDB Postgres Advanced Server and gives instructions for setting up compatibility during installation and for checking its availability in an existing cluster.
What is the Equivalent of ROWID in PostgreSQL?
February 12, 2020
This article looks at how the ctid field in PostgreSQL functions as an approximate equivalent to ROWID in Oracle databases. The ctid field is introduced and its function as a unique identifier is then explained.
Why more and more enterprises are choosing PostgreSQL as their go-to database!
February 7, 2020
This article notes the rise in popularity of PostgreSQL among enterprise businesses and discusses some of the advantages PostgreSQL offers over other database systems.
How to sort rows using ORDER BY and SELECT in PostgreSQL: 6 Examples
February 7, 2020
This article reviews five ways to sort table data using the ORDER BY clause together with the SELECT statement in PostgreSQL.
How to modify data in PostgreSQL using INSERT, UPDATE, UPDATE JOINS, DELETE and UPSERT
February 7, 2020
This article reviews how to use the basic data manipulation language (DML) types INSERT, UPDATE, UPDATE JOINS, DELETE, and UPSERT to modify data in tables.
Benchmarking PostgreSQL on an AWS m5.metal instance
January 24, 2020
This article discusses the results of benchmark tests made using pgbench to test the performance of different versions of PostgreSQL on an instance of AWS m5.metal.
Using Foreign Data Wrappers to access remote PostgreSQL and Oracle databases
January 14, 2020
This article explains how to use Foreign Data Wrappers to access data in remote PostgreSQL and Oracle databases.
How to use PostgreSQL with Go
January 9, 2020
This article covers how to use PostgreSQL together with the programming language Golang (Go). After showing how to get started with Go’s Object Relational Mapper, it offers an example of setting up a PostgreSQL database using Go.