Shareplex looks for Oracle SID in /var/opt/oracle/oratab for Sun servers and in /etc/oratab file for other Unix servers.
1. For cause 1 and 2, edit the oratab file to correct the SID entry.
2. For cause 3:
- correct the SID in config file
- shutdown Shareplex on source and target
- run ora_cleansp on source and target
- activate config on the corrected config file on source