RMAN-20005: target database name is ambiguous

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RMAN-20005: target database name is ambiguous

RMAN>RESTORE CONTROLFILE FROM TAG 'PR_WEEKLY_INCR0';

Starting restore at 26-OCT-20
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of restore command at 10/26/2020 09:43:38
RMAN-12010: automatic channel allocation initialization failed
RMAN-06004: ORACLE error from recovery catalog database: RMAN-20005: target database name is ambiguous

Cause:

Multiple registration of the database in catalog. Run the query below against catalog database to find out the duplicate entry

SQL>SELECT DB.DB_KEY,DB.DB_ID, DB.CURR_DBINC_KEY, DBINC.DB_NAME
        FROM DB, DBINC
       WHERE DB.CURR_DBINC_KEY = DBINC.DBINC_KEY
         AND DBINC.DB_NAME   = 'UC43P' ;

DB_KEY DB_ID CURR_DBINC_KEY DB_NAME
10673459 3054236580 10673460 ORCL1P
10268423 3051001234 10268424 ORCL1P

Solution:

Identify the correct DB ID of the database.

set the dbid and re-run the restore command

RMAN> set dbid=3054236580;
RMAN>RESTORE CONTROLFILE FROM TAG 'PR_WEEKLY_INCR0';
executing command: SET DBID
database name is "ORCL1P" and DBID is 3054236580

executing command: SET until clause

Starting restore at 26-OCT-20
using channel ORA_SBT_TAPE_1
using channel ORA_SBT_TAPE_2
using channel ORA_DISK_1

channel ORA_SBT_TAPE_1: starting datafile backup set restore
channel ORA_SBT_TAPE_1: restoring control file
channel ORA_SBT_TAPE_1: reading from backup piece c-3054236580-20201024-04
channel ORA_SBT_TAPE_1: piece handle=c-3054236580-20201024-04 tag=TAG20201024T093702
channel ORA_SBT_TAPE_1: restored backup piece 1
channel ORA_SBT_TAPE_1: restore complete, elapsed time: 00:00:03
output file name=/ora00_data1/ORCL1P/control/control_01.ctl
output file name=/ora00_data2/ORCL1P/control/control_02.ctl
output file name=/ora00_data3/ORCL1P/control/control_03.ctl
Finished restore at 26-OCT-20

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