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ORA-15385: file group XXXX does not exist While Cloning PDB oracle 18c


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Point-In-Time Database Cloning With Oracle ASM Flex Disk Groups  throwing ORA-15385: file group xxx  does not exist

While testing the new 18c ASM feature I encountered this error.

SQL> alter session set container=PDB01;
Session altered.
SQL> ALTER PLUGGABLE DATABASE PREPARE MIRROR COPY PDB01_CLONE;
ALTER PLUGGABLE DATABASE PREPARE MIRROR COPY PDB01_CLONE
*
ERROR at line 1:
ORA-15385: file group 'TST1T_PDB01' does not exist

 Cause
Since the above feature requires the FLEX Diskgroup I converted my Normal Redundancy Diskgroup to FLEX Diskgroup and executed the
PREPARE. The PREPARE started throwing the error.

ORA-15385: file group 'TST1T_PDB01' does not exist

Solution:
Restarting the database fixed the issue

 SQL> startup force;
ORACLE instance started.
Total System Global Area 2147482464 bytes
Fixed Size                  8899424 bytes
Variable Size            1912602624 bytes
Database Buffers          218103808 bytes
Redo Buffers                7876608 bytes
Database mounted.
Database opened.
SQL> SQL> alter session set container=PDB01;
Session altered.
SQL>  ALTER PLUGGABLE DATABASE PREPARE MIRROR COPY PDB01_CLONE;
Pluggable database altered.

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