DBG11017I SVCDUMP INVOKED BY TIMED REQUEST triggered by Sysview for Db2.`
Article ID: 436043
Updated On:
Products
Issue/Introduction
The Sysview Performance Management Option for Db2 for z/OS (IDB2) Data Collector triggers an automated SVC dump with the following message:
IEA794I SVC DUMP HAS CAPTURED: DUMPID=XXX REQUESTED BY JOB (JOBNAME) DUMP TITLE=DBG11017I SVCDUMP INVOKED BY TIMED REQUEST
Cause
This dump is automatically invoked when the IDB2 Data Collector encounters an unusual delay (greater than 90 seconds) in scheduled timed events, such as the collection of subsystem statistics. Analysis of the SVC dump typically reveals a delay in the CREATE THREAD function. This function is required to issue IBM Instrumentation Facility Interface (IFI) calls to retrieve Db2 data. In environments with a large Data Sharing Group, the default configuration may not provide enough subtasks to handle concurrent thread requests efficiently.
Resolution
To eliminate the timing delays and prevent further automated SVC dumps, perform the following configuration updates in the IDB2 SYSPARMS:
1. Adjust NUMPTASKS - Update the NUMPTASKS parameter to ensure sufficient subtasks are available. The recommended value is the number of members in the Db2 Data Sharing Group plus one.
Example: For an 2-way Data Sharing Group, set NUMPTASKS=3
For an 3-way Data Sharing Group, set NUMPTASKS=4
For an 4-way Data Sharing Group, set NUMPTASKS=5
2.Restart the Data Collector - Recycle the Data Collector task to apply the parameter changes
Additional Information
Refer to the tracing parameters documentation for detailed information on configuring IDB2 Data Collector system parameters.
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