Environment Variables

This topic contains a reference of the environment variables that you set for HAWQ.

Set these in your user’s startup shell profile (such as ~/.bashrc or ~/.bash_profile), or in /etc/profile, if you want to set them for all users.

Required Environment Variables

Note: GPHOME, PATH and LD_LIBRARY_PATH can be set by sourcing the greenplum_path.sh file from your HAWQ installation directory.


This is the installed location of your HAWQ software. For example:

export GPHOME


Your PATH environment variable should point to the location of the HAWQ bin directory. For example:

export PATH 


The LD_LIBRARY_PATH environment variable should point to the location of the HAWQ/PostgreSQL library files. For example:


Optional Environment Variables

The following are HAWQ environment variables. You may want to add the connection-related environment variables to your profile, for convenience. That way, you do not have to type so many options on the command line for client connections. Note that these environment variables should be set on the HAWQ master host only.


This is the name of the application that is usually set by an application when it connects to the server. This name is displayed in the activity view and in log entries. The PGAPPNAME environmental variable behaves the same as the application_name connection parameter. The default value for application_name is psql. The name cannot be longer than 63 characters.


The name of the default database to use when connecting.


The HAWQ master host name.


The numeric IP address of the master host. This can be set instead of, or in addition to, PGHOST, to avoid DNS lookup overhead.


The password used if the server demands password authentication. Use of this environment variable is not recommended, for security reasons (some operating systems allow non-root users to see process environment variables via ps). Instead, consider using the ~/.pgpass file.


The name of the password file to use for lookups. If not set, it defaults to ~/.pgpass.

See The Password File under Configuring Client Authentication.


Sets additional configuration parameters for the HAWQ master server.


The port number of the HAWQ server on the master host. The default port is 5432.


The HAWQ user name used to connect.


Sets the default style of date/time representation for a session. (Equivalent to SET datestyle TO....)


Sets the default time zone for a session. (Equivalent to SET timezone TO....)


Sets the default client character set encoding for a session. (Equivalent to SET client_encoding TO....)