Listener unresponsive, ORA-445 in Alert log

刘泽宇

现象：
+ Listener unresponsive.
   There was a gap in the listener log from when the issue occurred, to when we attempted a listener restart. The listener restart did not work eventually, a full server reboot was done which resolved the issue.

+ CPU and RAM were fine during this period.

+ During this time, there were a huge number of ORA-0445 errors generated in the alert log also.
   An excerpt of the first error is below, these were spooled repeatedly every few minutes until the server was rebooted and the error was resolved.

Errors in file $ADR_BASE\diag\rdbms\DB\SID\trace\SID_mmon_xxxx.trc (incident=xxxxxx) (PDBNAME=CDB$ROOT):
ORA-00445: background process "MZ00" did not start after 120 seconds
Incident details in: $ADR_BASE\diag\rdbms\DB\SID\incident\incdir_xxxxxx\SID_mmon_xxxx_ixxxxxxx.trc
2022-02-13 10:05:12.323000 +00:00
kkjcre1p: unable to spawn jobq slave process

原因：
The issue is similar to unpublished Bug 32730176 which closed as a duplicate of the Bug 31834214.

解决方法：
Bug 31834214 is fixed in RU19.14 and later. To solve this issue, please apply the RU19.14 or above.