Why my Area was extended without getting any x37 failure and no apparent reason.

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Article ID: 19726

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Products

Compress Data Compression for MVS Compress Data Compression for Fujitsu Datacom DATACOM - AD Disk Backup and Restore - MVS DISK BACKUP AND RESTORE- ADD-ON OPTIO DISK BACKUP AND RESTORE Ideal CIS COMMON SERVICES FOR Z/OS 90S SERVICES DATABASE MANAGEMENT SOLUTIONS FOR DB2 FOR Z/OS COMMON PRODUCT SERVICES COMPONENT Common Services CA ECOMETER SERVER COMPONENT FOC EASYTRIEVE REPORT GENERATOR FOR COMMON SERVICES INFOCAI MAINTENANCE IPC UNICENTER JCLCHECK COMMON COMPONENT Mainframe VM Product Manager CHORUS SOFTWARE MANAGER CA ON DEMAND PORTAL CA Service Desk Manager - Unified Self Service PAM CLIENT FOR LINUX ON MAINFRAME MAINFRAME CONNECTOR FOR LINUX ON MAINFRAME GRAPHICAL MANAGEMENT INTERFACE WEB ADMINISTRATOR FOR TOP SECRET Xpertware

Issue/Introduction

Symptom:

Messages in the CA Datacom Multi-user (MUF) output log show that an Area that allowed for dynamic extend was extended during a data load but there were no x37 failure or messages. Messages in the MUF log:

 DB01703I - DYNAMIC EXTEND OF AREA CBX00106 STARTED

 DB01701I - DYNAMIC EXTEND OF AREA CBX00106 ENDED, TRACKS BEFORE 2,490 TRACKS AFTER 2,610

Also, a CXX report of the Area before the load showed statistics the Area with a single Table was only 13% full so there was plenty of room with no apparent reason.

Cause:

Prior MUF failure.

Environment:

z/OS and z/VSE

Resolution:

The dynamic extend occurred because the area free space index was inaccurate. This can occur as a result of a MUF failure since the free space index is maintained in memory and processed by the pipeline. The free space index is located in the IXX and Data buffers. If a MUF fails, both the free space index and the CXX statistics may no longer reflect what is actually in a data area.

If you experience this symptom, you can run DBUTLTY with RETIX KEYNAME=*DATA to repair the free space index and DBUTLTY with KEYNAME=*SETR to update the CXX statistics with a more accurate record count.

Additional Information:

More information can be found in the CA Datacom/DB DBUTILTY Reference Guide 14.0 and above: Paragraph: Chapter 37: RETIX (Reconstruct Index)

https://support.ca.com/cadocs/0/CA%20Datacom%20V15%200%20Public-ENU/Bookshelf_Files/PDF/DatacomDB15--DBUTLTY_Ref_zOS_ENU.pdf

 

Environment

Release: DATABB00200-14-Datacom/AD
Component: