That’s where the CLOSE_USER_SESSIONS function comes in handy. It will stop all the sessions for a user, rolling back any transactions currently running, and close the connection.
Example:
dbadmin=> SELECT COUNT(*) FROM sessions WHERE user_name = 'jim';
COUNT
-------
33
(1 row)
dbadmin=> SELECT session_id FROM sessions WHERE user_name = 'jim' LIMIT 2;
session_id
-----------------------------------
v_test_db_node0001-22211:0x20f7e7
v_test_db_node0001-22211:0x20f7ef
(2 rows)
I could close the sessions one by one:
dbadmin=> SELECT CLOSE_SESSION('v_test_db_node0001-22211:0x20f7e7');
CLOSE_SESSION
--------------------------------------------------------------------
Session close command sent. Check v_monitor.sessions for progress.
(1 row)
dbadmin=> SELECT CLOSE_SESSION('v_test_db_node0001-22211:0x20f7ef');
CLOSE_SESSION
--------------------------------------------------------------------
Session close command sent. Check v_monitor.sessions for progress.
(1 row)
dbadmin=> SELECT COUNT(*) FROM sessions WHERE user_name = 'jim';
COUNT
-------
31
(1 row
But that would take forever. Instead, I’ll close all of the sessions at once!
dbadmin=> SELECT close_user_sessions('jim');
close_user_sessions
------------------------------------------------------------------------------
Close all sessions for user jim sent. Check v_monitor.sessions for progress.
(1 row)
dbadmin=> SELECT COUNT(*) FROM sessions WHERE user_name = 'jim';
COUNT
-------
0
(1 row)
Links:https://www.vertica.com/docs/latest/HTML/Content/Authoring/SQLReferenceManual/Functions/VerticaFunctions/CLOSE_USER_SESSIONS.htm https://www.vertica.com/docs/latest/HTML/Content/Authoring/SQLReferenceManual/Functions/VerticaFunctions/CLOSE_SESSION.htm https://www.vertica.com/docs/latest/HTML/Content/Authoring/SQLReferenceManual/SystemTables/MONITOR/SESSIONS.htm
Have fun!
About the Author
James Knicely
Vertica Field Chief Technologist
I've had the privilege of working with many database technologies in my career. But after being introduced to Vertica in May of 2011 as a client, I was hooked on the new technology after witnessing a query run in milliseconds that had previously ran for hours on the legacy database we had in place. It was then that I knew I wanted to eventually join the Vertica team, and 4 years later I did! I am currently a Vertica evangelist and am ready to help you get on board! Please feel free to reach out to me with any questions you have about Vertica and make sure to follow my Vertica Quick Tips!
