Help Center/ DataArts Fabric/ Developer Guide/ SQL Syntax Reference/ Functions and Operators/ System Information Functions/ Session Information Functions
Updated on 2025-12-19 GMT+08:00
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Session Information Functions

pg_backend_pid()

Description: Process ID of the service process connected to the current session.

Return type: integer.

Example:

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SELECT pg_backend_pid();
 pg_backend_pid
-----------------
 140229352617744
(1 row)

pg_postmaster_start_time()

Description: Server start time. pg_postmaster_start_time returns the timestamp with time zone when the server started.

Return type: timestamp with time zone.

Example:

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SELECT pg_postmaster_start_time();
   pg_postmaster_start_time   
------------------------------
 2017-08-30 16:02:54.99854+08
(1 row)

session_user

Description: Session username. session_user is typically the initial user who connects to the current database.

Return type: name.

Example:

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SELECT session_user;
 session_user
--------------
 dbadmin
(1 row)

user

Description: Equivalent to current_user.

Return type: name.

Example:

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SELECT user;
 current_user
--------------
 dbadmin
(1 row)

version()

Description: Version information. version returns a string describing the server's version information.

Return type: text.

Example:

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SELECT version();
                                                                version                                                                
---------------------------------------------------------------------------------------------------------------------------------------
 PostgreSQL 9.2.4 gsql ((GaussDB 8.2.1 build 39137c2d) compiled at 2022-09-23 15:43:11 commit 3629 last mr 5138 release) on x86_64-unknown-linux-gnu, compiled by g++ (GCC) 5.4.0, 64-bit
(1 row)