Skip to main content
InSource Solutions

TN MES118 Clearing the MESDB Database Sessn Table

  1. Last updated
  2. Save as PDF

InSource_Logo_Transparent.png

Description

This article from InSource shows how to clear a session id from Wonderware MES 2014 R3. An orphaned session may prevent the login from a client application.

  • Author: Rich Brooks
  • Published: 6/19/2017
  • Applies to: MES 2014 R3 and higher

Details

The MESDB database includes a Sessn table which holds the currently active client information.  A record is added to the Sessn table when the application is opened.  The Wonderware MES Service is responsible to clear out any records after 10 minutes of inactivity.

Capture1.JPG

Shutting down the MES Service improperly may prevent the session records from being cleared.  

Capture2.JPG

This may prevent a client from logging in from one of the applications as listed below.

Capture3.JPG

Delete the problem record from the Sessn table by filtering on the session_id.

Capture4.JPG

Restart the MES Service after the record is cleared.  You should now be able to log into the application as expected.