17.10 - Gateway Global Commands - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - Database Utilities

Advanced SQL Engine
Teradata Database
Release Number
July 2021
English (United States)
Last Update
Gateway Global presents a command-line environment that allows the entry of Gateway Global commands, which perform the following functions:
  • Display network and session information
  • Administer users and sessions
  • Perform routine and special diagnostics
  • Reload TLS configuration and certificate/key pair.

Specifying a Host

Some commands require you to specify a host group before you can initiate the command action. To specify a host group, use the SELECT HOST command. SELECT HOST allows input of a specific host group number to define the scope used by a subsequent command function.

Selecting host 0 resets the host group selection.

The following sections summarize the functions of each command, and indicate whether the command requires the use of SELECT HOST.

Displaying Network and Session Information

DISPLAY commands allow you to display your network configuration, sessions, and vprocs associated with the gateway, plus information about specific sessions.

Command Function Requires SELECT HOST
DISPLAY DISCONNECT Displays a list of sessions that have disconnected. Yes
DISPLAY FORCE Displays sessions that have been successfully killed or aborted using Performance Monitoring and Production Control (PMPC) abort process. Yes
DISPLAY GTW Displays all sessions connected to the gateway. No
DISPLAY NETWORK Displays network configuration information. No
DISPLAY SESSION Displays the following information on a specific session: User name, IP address, TCP socket number, state, event, action, partition, and authentication method. Yes
DISPLAY STATS Displays the RSS statistics for the gateway vproc. No
DISPLAY TIMEOUT Displays the timeout value. Yes
DISPLAY USER Displays the session number, PE number, User name, IP address, and current connection status. Yes

Administering Users and Sessions

These commands allow you to control gateway traffic and access to the database.

Command Function Requires SELECT HOST
DISABLE LOGONS Disables all logons to the database through the gateway. Yes
ENABLE LOGONS Enables logons to the database through the gateway. Yes
KILL SESSION Terminates a specific session. Yes
KILL USER Terminates all sessions of a specific user. Yes
SET TIMEOUT Sets a timeout value. Yes

Reloading TLS Configuration and Certificate/Key Pair

These commands allow you to update the TLS configuration file and load a new certificate/key pair.

Command Function Requires SELECT HOST
REREAD TLS CONFIG Updates the TLS configuration, such as cipher suites, from the gateway TLS file.

If you make changes in the TLS configuration file /usr/tgtw/etc/gtwtls.cfg, you can use REread TLS Config to reload that configuration file with the new changes.

REREAD TLS CERTIFICATE Updates the TLS certificate and private key from the new gateway TLS certificate and key files.

If you installed a new certificate/pair, you can use REread TLS Certificate to load them.


Performing Special Diagnostics

The TRACE commands allow you to debug internal gateway errors or anomalies.

Command Function Requires SELECT HOST
ENABLE TRACE Records internal gateway events. Yes
DISABLE TRACE Turns off the recording of event tracing and writing to the gateway log files. Yes
FLUSH TRACE Directs the gateway to write the contents of its internal trace buffers to the gateway log files. Yes

Logging Sessions Off Using KILL

When you issue a KILL command, any outstanding requests are first aborted. The specified session is logged off. The following table describes the KILL command behavior.

IF the session is currently... THEN...
disconnected the assign task attempts a log off by setting the KILL flag to indicate that an attempt has been made to log off.
logged on a kill message is sent to the connect task to abort any outstanding requests and then to log off.
Aborting an outstanding request could take a significant amount of time. Therefore, killing a specific session or all of a user’s sessions does not necessarily free up the resources of those sessions immediately. For more information on KILL commands, see KILL SESSION and KILL USER.

Getting Help

To list all the Gateway Global commands, type help at the command line. The help command displays a menu of all Gateway Global commands alphabetically, and shows the syntax for each command. The letter h can be used as a synonym for help.