Instance does not open spinning with 100% CPU utilization
(Doc ID 1554569.1)
Last updated on MARCH 07, 2025
Applies to:
Oracle Database - Enterprise Edition - Version 11.1.0.7 to 11.2.0.4 [Release 11.1 to 11.2]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 Database Exadata Express Cloud Service - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.
Symptoms
+ Oracle Database 11.1.0.7 (Standalone) got hung and no more connections were feasible including SYSDBA.
+ Customer took the decision to kill SMON at the operating system level.
+ Since then, the instance can be mounted but never opened.
+ When startup is issued, a new Oracle process is forked at the OS with 100% CPU usage.
+ The V$INSTANCE.STATUS shows OPEN, and the V$DATABASE.OPEN_MODE shows READ WRITE.
+ However, the "alter database open" is never reported as completed in the alert log file.
+ Also, the DBA_* and V$* views are accessible. However, no connections can be done to the application schemas.
+ Trying to "startup upgrade" hangs also.
Changes
Background SMON was killed explicitly at the operating system level when instance was hung.
Cause
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In this Document
| Symptoms |
| Changes |
| Cause |
| Solution |
| References |