GSM-46558
VLD55: TNS alias {0} for Database: {1} cannot be resolved.
Cause
TNS alias used as connect indentifier for in DataGuard or GDS configuration cannot be resolved in the GDSCTL environment. If GDSCTL is running in GSM environment the latter has following implications: for sharding- Dataguard observer cannot run in this host; for GDS - GSM is not able to connect to shard/database.
Action
Make sure that TNS alias is present in tnsnames.ora file; Otherwise change connection string in catalog by executing MODIFY DATABASE command. In sharding environment, you should check V$DG_BROKER_CONFIG.CONNECT_IDENTIFIER field to make sure it does not contain alias. If it is, use DGMGRL to modify connection string.