OpenVMS: Parallel Query Hangs in sskgmrf_unmaprange in RAC
(Doc ID 1299652.1)
Last updated on AUGUST 24, 2021
Applies to:Oracle Database Cloud Schema Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
HP OpenVMS Itanium
HP OpenVMS Alpha
Running Oracle 10gR2 on the OpenVMS operating system.
Parallel Operations (like parallel query, parallel statisctics gethering) can result in one of the related PQ Worker hanging.
The process state of the hung worker process shows that the hang appears in the Oracle function sskgmrf_unmaprange.
However, above the Oracle function there are a number of OpenVMS functions which when translated using SDA MAP commands on the given machine indicate that the OS call stack is:
sskgmrf_unmaprange --> C$MMAP\munmap --> C$MMAP\msync --> sys$updsec_64w --> EXE_STD$SYNCH_LOOP --> SYS$WAITFR --> sch$ast_outermode
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