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What is Postgresql?

PostgreSQL is a powerful, open source object-relational database system based on

POSTGRES, Version 4.2, developed at the University of California at Berkeley Computer

Science Department. It is fully ACID(Atomicity, Consistency, Isolation, Durability) compliant,

has full support for foreign keys, joins, views, triggers, and stored procedures (in multiple

languages). It includes most SQL:2008 data types, including INTEGER, NUMERIC, BOOLEAN,

CHAR, VARCHAR, DATE, INTERVAL, and TIMESTAMP. It also supports storage of binary

large objects, including pictures, sounds, or video. It has native programming interfaces for C/

C++, Java, .Net, Perl, Python, Ruby, Tcl, ODBC, among others, and exceptional documentation.

An enterprise class database, PostgreSQL boasts sophisticated features such as Multiversion

concurrency control (MVCC), Point in time recovery, Tablespaces, Savepoints, asynchronous

replication, asynchronous replication, online/hot backups, a sophisticated query planner/

optimizer, and write ahead logging for fault tolerance. It supports international character sets,

multibyte character encodings, Unicode, and it is locale-aware for sorting, case-sensitivity,

and formatting. It is highly scalable both in the sheer quantity of data it can manage and in

the number of concurrent users it can accommodate. There are active PostgreSQL systems

in production environments that manage in excess of 4 terabytes of data. Some general

PostgreSQL limits are included in the table below.