Installing PostgreSQL

To install PostgreSQL on your Virtual Private Server, connect to your server via Telnet or SSH and run the following command:

% vinstall pgsql

The PostgreSQL installation includes all the necessary PostgreSQL files, initializes a database with the same name as your user name, and activates the postmaster daemon. Several wrapper scripts are available for all PostgreSQL commands. The wrapper scripts are automatically created when PostgreSQL is installed.

PostgreSQL is installed in a version-specific directory (~/usr/local/pgsql-7.X.X) and a symlink named pgsql is created that points to that directory.

Configuration

If you choose to configure PostgreSQL, add the following lines to your shell startup file, according to which shell your Virtual Private Server is running.

NOTE: To find out which shell your server is running, type:

% echo $SHELL

/bin/csh - If you are using /bin/csh or one of its variants, then add the following lines to the ~/.cshrc file on your Virtual Private Server.
```
setenv PGDATA /usr/local/pgsql/data
setenv PGLIB /usr/local/pgsql/lib
set path = (/usr/local/pgsql/bin $path)
```
/bin/sh & /bin/bash - If you are using the Bourne shell (/bin/sh or /bin/bash) then add the following lines to the ~/.profile file on your server:
```
PATH=$PATH:/usr/local/pgsql/bin
PGDATA=/usr/local/pgsql/data
PGLIB=/usr/local/pgsql/lib
export PGDATA PGLIB
```

The psql Client

The main tool for using PostgreSQL is the psql client. To start psql use this command:

% psql

The psql client will start up and you will be able to type in SQL code and ask for help.

NOTE: You may see the following error:

Connection to database '(null)' failed.
FATAL: PQsetdb: Unable to determine a Postgres username!

To resolve this, simply use the following command:

% vpwd_mkdb ~/etc/passwd

This program will read your password file at ~/etc/passwd and create a Berkeley DB format file. PostgreSQL uses this new file to look up user names and account information.

Multi-Language Abilities in PostgreSQL

PostgreSQL allows for a number of languages by enabling specific character-sets in the databases. When you create a database in PostgreSQL, you can use the -E flag to enable support for a specific character set.

% initdb -E SET

The following is a list of the available character sets and the SET name to use to enable support for it.

SET		Description
SQL_ASCII		ASCII
EUC_JP		Japanese EUC
EUC_CN		Chinese EUC
EUC_KR		Korean EUC
EUC_TW		Taiwanese EUC
UNICODE		Unicode(UTF-8)
MULE_INTERNAL		Mule Internal Code
LATIN1 ISO 8859-1		English and some Europe Lang
LATIN2 ISO 8859-2		English and some Europe Lang
LATIN3 ISO 8859-3		English and some Europe Lang
LATIN4 ISO 8859-4		English and some Europe Lang
LATIN5 ISO 8859-5		English and some Europe Lang
KOI8		KOI8-R(U)
WIN		Windows CP1251
ALT		Windows CP866

Removing PostgreSQL

To remove PostgreSQL from your server, connect to it via Telnet or SSH and do the following:

% vuninstall pgsql

Edit your ~/etc/rc file, removing the line that contains postmaster.

Run the ps command, like this:

% ps -x

Determine the process ID of the PostgreSQL daemon and use kill to stop the PostgreSQL daemon:

% kill PROCESS-ID