Sometimes You can get “ORA-12538: TNS:no such protocol adapter ” error.
Details of error are as follows.
ORA-12538: TNS:no such protocol adapter
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=msdbadm01)(PORT=1521))) TNS-12538: TNS:no such protocol adapter TNS-12560: TNS:protocol adapter error TNS-00508: No such protocol adapter..
To solve this error, run the relink all as follows.
$ORACLE_HOME/bin relink all
Then try to start again. It will work fine.
Sometimes you may run the lsnrctl status command with different OS user instead of Oracle, in this time you can get this error.
Do you want to learn more details about RMAN, then read the following articles.