Install PostgreSQL 10.1 on Fedora 28/27, CentOS/RHEL/SL 7.5/6.9

This is guide, howto install PostgreSQL 10.1 (currently 10.1) database server on Fedora 28/27/26, CentOS/Red Hat (RHEL)/Scientific Linux (SL) 7.5/6.9. This guide uses PostgreSQL own YUM repos, which are always up-to-date and stable releases are available instantly. Note: If you are upgrading PostgresSQL (from earlier version), then make sure that you backup (dump and copy) your database and configs. [inttf_post_ad1] 1. Install PostgreSQL 10.1 Database Server on Fedora 28/27/26,...

Postgresql (psql) .psqlrc tips and tricks

Psql is a good tool for the PostgreSQL database management and use. Psql client functioning can easily be improved by adding a few lines ~/.psqlrc file. Set all null fields to NULL: \pset null 'NULL' After this, the query results look like this: select 'test' as test_text, null as test_null; test_text | test_null -----------+----------- test | NULL (1 row) Set the command history file names for each host and database: \set HISTFILE ~/.psql_history- :HOST -...

Install PostgreSQL 8.4 Database Server on CentOS, Fedora, Red Hat

This is quick guide howto install PostgreSQL 8.4 (current stable 8.4.7) database server on CentOS, Fedora and Red Hat. Fedora 14, Fedora 13, CentOS 5.5 and Red Hat (RHEL) 5.5 has PostgreSQL 8.4 database server as default so extra repositories is not needed. Personally, I like to use Postgres own repositories, because the latest version of PostgreSQL may be quickly and easily installed. The following commands run as root and postgres user, so "su -" or "sudo -i" first. Install PostgreSQL...

Install MongoDB 2.4.4 on Fedora 18/17, CentOS/Red Hat (RHEL) 6.4/5.9

What is MongoDB?MongoDB (from "humongous") is a scalable, high-performance, open source, schema-free, document-oriented database. Written in C++. MongoDB bridges the gap between key-value stores (which are fast and highly scalable) and traditional RDBMS systems (which provide structured schemas and powerful queries). MongoDB is very interesting document-oriented database, because it has really awesome features: Document-oriented storage (the simplicity and power of JSON-like data...

PostgreSQL: Partitioned Table vs Non Partitioned Table (Part 3)

This article compares the speed and performance of queries between partitioned and non partitioned PostgreSQL tables. However, it is important to remember that the PostgreSQL tables partitioning has also another benefits, than the better performance on queries. More information about other benefits from the first part 'Howto create PostgreSQL table partitioning (Part 1)'. This is comparision between partitioned and non partitioned PostgreSQL tables. The same tests were carried out with and...

PHP Script to Generate PostgreSQL Table Partitioning (Part 2)

As Part 1 (Howto create PostgreSQL table partitioning) shows, making of PostgreSQL partitioning needs a lot of SQL commands. So this Part 2 explains how SQL commands for PostgreSQL partitioning can be made with a simple PHP script. This example script make SQL for child tables, indexes, trigger function and parent table trigger. This example script can make PostgreSQL table partitioning with using Date ranges. Script can be configured with following configuration section: Initial...

Create PostgreSQL Table Partitioning (Part 1)

PostgreSQL supports partitioning via table inheritance. So the partitioning is made in such a way that every child table inherits single parent table. Parent table is empty and it exists just to describe the whole data set. PostgreSQL partitioning can be implemented in range partitioning or list partitioning. Range partitioning can be done for example by ID ranges (like 0-100 000, 100 001-200 000, 200 001-300 000...) or Date ranges (like 2009-11-01 - 2009-11-30, 2009-12-01 -...

Partitioning PostgreSQL Tables – Handle Millions of Rows Efficiently

PostgreSQL table partitioning means splitting one large database table into smaller logical pieces. PostgreSQL table partitioning will be worthwhile only when a table would be very large. Here are a few benefits of what can be achieved with partitioning: Large tables query performance can be improved dramatically Reducing index size and making it more likely that the heavily-used parts of the indexes fit in memory Rarely used data can be moved to slower and cheaper storage...

PostgreSQL Sleep Function pg_sleep – Postgres Delay Execution

One day, I was looking for PostgreSQL database function, which could delay the execution of queries. At first I thought that I will do one myself, because I do not remember ever seen this kind function. But then I found pg_sleep Postgres function which directly delay execution of the server process. pg_sleep makes the current session's process sleep until seconds seconds have elapsed. Seconds is a value of type double precision, so fractional-second delays can be specified. pg_sleep...
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