Multiple Database Processes Spawned for Long Running Report When using Oracle REST Data Services (ORDS) / Weblogic (Doc ID 2004539.1)

Last updated on FEBRUARY 09, 2023

Applies to:

Symptoms

Several reports are running in acceptable times on the database (they have been optimised) as monitored through AWR reports and through SQLPLUS from the Weblogic but there is a significant delay in the data being displayed in the Apex application in the browser.

In monitoring the SQL sessions generated on the database by an APEX session, it has been observed that:

• A new database session is spawned every 5 minutes.
  When a new session is spawned, the current session becomes inactive. 
• Eventually the user sees a HTTP 500 error.
• The following messages appear in the OHS error log (ohs1.log). These messages correspond to the new database sessions spawned, and the eventual HTTP 500 error: 

Other Information

• APEX version: 4.0
• ORDS 2.0.8 deployed through WLS. using Oracle HTTP Server (OHS) and the WLS plug-in
• When request are made directly to the WLS managed server, rather than through the OHS, the error does not occur.

Cause

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