3437930 - Shadow instance fails to connect to database

During SAP system upgrade, the shadow instance cannot connect to database, the following error happens in work process trace:

C  check2: OCIStmtExecute() failed with -1=OCI_ERROR
C          SQL error 942:
C     ORA-00942: table or view does not exist                                                                                       
C     statement for table 'SVERS                         ':
C         SELECT VERSION FROM SVERS                                                                                                 
C     stmt_fetch() -> orc=942, 103=DBSL_ERR_DBOBJECT_UNKNOWN
B  ***LOG BZA=> table SVERS does not exist on database  [dblink       1327]
M  ***LOG R19=> ThInit, db_connect ( DB-Connect 004096) [thxxhead.c   1599]
M  in_ThErrHandle: 1
M  *** ERROR => ThInit: db_connect (step 1, th_errno 13, action 3, level 1) [thxxhead.c   11793]

SAP on Oracle

ORA-00942, SVERS , KBA , BC-DB-ORA , Oracle , Problem