While running adcfgclone.pl as oracle user, the session just hangs without giving any error in the log file. The issue was that it wasn’t able to connect to the database as : sqlplus "/as sysdbaa This can be occur due to improper shutdown of the database. While in the course of a database shutdown, if any of the oracle process is not completed killed and it holds a large shared memory segment, such issues can occur which would prevent from normal database operation. So next time when an instance tries to start it is not able to grab a large chunk of memory to get started. This can be checked as follows: After the database has been shut down , there shouldn’t be any processes running as oracle on the server level: ipcs -m | grep <oracle user> eg: ipcs -m | grep oracle key shmid owner perms ...
DBA, EBS R12.2, 19c upgradation , OCI, Oracle analytic