"System is overloaded, try again" for OPAC searches (due to clock change)

Description

* The message "System is overloaded, try again" occurs for OPAC searches.
* "Error: License limit exceeded" is seen in the www_server log.

Cause:
As part of a reboot the server clock was incorrectly set forward 4 hours. After the server had been up for 8 hours, the clock was corrected (set back 4 hours). This caused z63 (OPAC session) records which had been inactive to be re-activated, causing the number of Active users (as seen in util y/11/2) to exceed the number of Licensed users.
 

Resolution

Avoid changing the server time as part of a reboot.
If the server time is inadvertently changed:

• run Aleph shutdown 

csh -f $alephe_root/aleph_shutdown

• correct the time
• run clear_vir01 (util x/8) cold 

* run Aleph startup 

csh -f $alephe_root/aleph_startup

Additional Information

Note: the following lines, showing evidence of the server time change, were seen in the www_server log:
2014-10-05 16:41:41 12 [002] [vrb] server_main: OUT 0.2277 11795
2014-10-05 12:42:02 43 [000] [vrb] IN 20141005 124202 <---- time drops back 4 hours!

For other causes, not involving server clock change, see Article 000009299 ("License limit exceeded or System is overloaded").

• Article last edited: 21-Jan-2020