IDB2 reported a DDF thread with a high 'Other XUS Wait' value

Products

• SYSVIEW Performance Management Option for DB2 for z/OS

Issue/Introduction

A  serious problem with a transaction occurred, and Sysview for Db2 (IDB2) showed the DDF thread to have an extremely high value for the 'Other XUS WAIT' field.  What could be causing this high value? 

Environment

Release : 20.0

Component : SYSVIEW Performance Management Option for DB2 for z/OS

Cause

Unknown.

Resolution

'Other XUS Wait' is reported from IBM element QWAXOTSE, in IFCID 003.  It is an accumulated wait time for a synchronous execution unit switch to other DB2 service tasks.  These other DB2 service tasks typically include the wait time for the network and the server to process a request.  For this particular (and isolated condition), the reason for the high value was unknown.  It is recommended to contact IBM for additional information.