The postgresql-contrib package contains various extension modules that are included in the PostgreSQL distribution.

The postgresql-contrib package contains various extension modules that are included in the PostgreSQL distribution.

The postgresql-docs package contains some additional documentation for PostgreSQL. Currently, this includes the main documentation in PDF format and source files for the PostgreSQL tutorial.

The postgresql-docs package contains some additional documentation for PostgreSQL. Currently, this includes the main documentation in PDF format and source files for the PostgreSQL tutorial.

PostgreSQL is an advanced Object-Relational database management system. The postgresql-jdbc package includes the .jar files needed for Java programs to access a PostgreSQL database.

pgpool-II is a inherited project of pgpool (to classify from pgpool-II, it is sometimes called as pgpool-I). For those of you not familiar with pgpool-I, it is a multi-functional middle ware for PostgreSQL that features connection pooling, replication and load balancing functions. pgpool-I allows a user to connect at most two PostgreSQL servers for higher availability or for higher search performance compared to a single PostgreSQL server. pgpool-II, on the other hand, allows multiple PostgreSQL servers (DB nodes) to be connected, which enables queries to be executed simultaneously on all servers. In other words, it enables "parallel query" processing. Also, pgpool-II can be started as pgpool-I by changing configuration parameters. pgpool-II that is executed in pgpool-I mode enables multiple DB nodes to be connected, which was not possible in pgpool-I.

Postgresql extensions libraries and sql files for pgpool-II.

The postgresql-plperl package contains the PL/Perl procedural language, which is an extension to the PostgreSQL database server. Install this if you want to write database functions in Perl.

The postgresql-plperl package contains the PL/Perl procedural language, which is an extension to the PostgreSQL database server. Install this if you want to write database functions in Perl.

The postgresql-plpython3 package contains the PL/Python3 procedural language, which is an extension to the PostgreSQL database server. Install this if you want to write database functions in Python 3.