Compiling pg_repack extension on binary format of PostgreSQL installation
Published on Tue, May 26, 2015

This blog is about compiling pg_repack extension on binary format of PostgreSQL installation. Most of you know, pg_repack extension is one of well known PostgreSQL extensions, its especially used for reclaiming space[bloats] ONLINE without holding an EXCLUSIVE LOCK on Tables/Indexes. To enable pg_repack extension in PostgreSQL database, it should be compiled from sources. Its quite easy and simple to compile from source on any installed variants(source,rpm,binary) of PostgreSQL, however its slightly different if it is with binary format of PostgreSQL [One Click Installer] as they are pre-built binary bundle with dependency libraries. Continue reading →

Configuring Automatic failover using Replication Manager 2.0 on PostgreSQL 9.3.5
Published on Tue, Jan 13, 2015

In PostgreSQL high availability(Streaming Replication/Hot Standby), one of the thing require human interference and has no automation, that is in the event of master database crash; initiating failover procedure(trigger file creation or pg_ctl promote command) on the standby. Because in core of PostgreSQL there’s no such built-in functionality to identify a failure of master and notify the standby. Thus, we require some automated tools to take over manual failover work or we have to dive into scripting land for writing our own script to do it. Continue reading →

Implementing Switchover/Switchback in PostgreSQL 9.3.
Published on Mon, Dec 29, 2014

This post educates sophisticated DBA’s on how to setup graceful Switchover and Switchback environment in PostgreSQL high availability. Firstly, thanks to patch authors Heikkiand Fujii for making Switchover/Switchback easier in PostgreSQL 9.3.(Pardom me if I missed other names). Let me attempt to illustrate it in short prior to these patches, all of you know Standby’s are critical components in achieving fast and safe disaster recovery. In PostgreSQL, recovery concept majorly deals with timelines to identify a series of WAL segments before and after the PITR or promotion of Standby to avoid overlapping of WAL segments. Continue reading →

Switchover/Switchback in Slony-I while upgrading PostgreSQL major versions 8.4.x/9.3.x
Published on Sat, Dec 13, 2014

Every new release of PostgreSQL comes with a packed of exciting features. To benefit new features, database server should be upgraded. Choosing traditional upgrade paths like pg_dump/pg_restore or pg_upgrade requires a significant downtime of application. Today, if you are looking for minimum downtime upgrade path among major PostgreSQL versions with perfect rollback plan, then it will be accomplished by asynchronous Slony-I replication. Since Slony-I (know more about it here) has the capability to replicate between different PostgreSQL versions,OS and bit architectures easily, so upgrades are doable without requiring a substantial downtime. Continue reading →

How to replicate only INSERTs not DELETEs/UPDATEs on Slony Slave Node ?
Published on Thu, Nov 20, 2014

In the first place, we need to know about why such requirement needed. IMO, its absolutely a business necessity to maintain some kind of historical data on the target database(Slave Node). Especially, out of multiple slave nodes one of the slave node to retain the very first form of the data when it initially written into the database. To accomplish this requirement, we should come up with some kind of filters like TRIGGERs/RULEs on Slave Node so that it avoids relaying DELETE and UPDATE statements. Continue reading →