PostgreSQL 9.4 Increases Flexibility, Scalability and Performance

From: Dave Page <dpage(at)postgresql(dot)org>
To: pgsql-announce <pgsql-announce(at)postgresql(dot)org>
Subject: PostgreSQL 9.4 Increases Flexibility, Scalability and Performance
Date: 2014-12-18 15:31:10
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18 DECEMBER 2014: The PostgreSQL Global Development Group announces the
release of PostgreSQL 9.4, the latest version of the world's leading open
source database system. This release adds many new features which enhance
PostgreSQL's flexibility, scalability and performance for many different
types of database users, including improvements to JSON support,
replication and index performance.


With the new JSONB data type for PostgreSQL, users no longer have to choose
between relational and non-relational data stores: they can have both at
the same time. JSONB supports fast lookups and simple expression search
queries using Generalized Inverted Indexes (GIN). Multiple new support
functions enable users to extract and manipulate JSON data, with a
performance which matches or surpasses the most popular document
databases. With JSONB, table data can be easily integrated with document
data for a fully integrated database environment.

"JSONB brings PostgreSQL to the JavaScript development community by
allowing JSON data to be stored and queried natively. Node.js and other
server-side JavaScript frameworks can benefit from the safety and
robustness of PostgreSQL, while still storing data in the schema-less
format that they prefer," said Matt Soldo, Product Manager, Heroku Postgres.


In 9.4, Logical Decoding supplies a new API for reading, filtering and
manipulating the PostgreSQL replication stream. This interface is the
foundation for new replication tools, such as Bi-Directional Replication,
which supports the creation of multi-master PostgreSQL clusters. Other
improvements in the replication system, such as replication slots and
time-delayed replicas, improve management and utility of replica servers.

"The main reason behind our immediate adoption of PostgreSQL 9.4 in
production is the new Logical Decoding feature," said Marco Favale,
Cartographic Production Manager of Navionics. "The ability to write custom
and flexible output plugins will allow us to transparently collect changes
on selected tables and replicate changes where we like, by removing heavier
- and more complex to manage - trigger based
replication solutions."

"Zalando relies on the stability and performance of hundreds of PostgreSQL
database servers to continuously serve millions of customers all around
Europe," said Valentine Gogichashvili, Team Lead Database Operations at
Zalando Technologies. "We are excited to run time-delayed standby servers
which work out of the box, and will evaluate the new bi-directional
replication tools as soon as they are released."


Version 9.4 also introduces multiple performance improvements which will
allow users to get even more out of each PostgreSQL server. These include:

* Improvements to GIN indexes, making them up to 50% smaller and up to 3X
* Concurrently updatable Materialized Views for faster, more up-to-date
* Rapidly reload the database cache on restart using pg_prewarm.
* Faster parallel writing to the PostgreSQL transaction log.
* Support for Linux Huge Pages for servers with large memory.

"We will definitely benefit from concurrent refresh of materialised views,
delayed standby servers (which will make our disaster recovery even more
robust) as well as the usual performance improvements every new release
carries on," added Marco Favale.


* Downloads:
* Press Kit:
* Release Notes:
* What's New in 9.4:

About PostgreSQL

PostgreSQL is the leading open source database system, with a global
community of thousands of users and contributors and dozens of companies
and organizations. The PostgreSQL Project builds on over 25 years of
engineering, starting at the University of California, Berkeley, and has an
unmatched pace of development today. PostgreSQL's mature feature set not
only matches top proprietary database systems, but exceeds them in advanced
database features, extensibility, security and stability. Learn more about
PostgreSQL and participate in our community at:

Dave Page
PostgreSQL Core Team


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