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Vendor has asked we change compatibility level from 18.0.0 to 12.2.0

in Database Administration (MOSC) 3 commentsAnswered ✓

Oracle database 19.3.0. A vendor has asked that we downgrade our compatibility level from 18.0.0 to 12.2.0. I have run the ALTER SYSTEM SET COMPATIBLE='12.2.0' scope=spfile; command and after that the database will not start. I have also backed up the control file to trace and copied the SQL for creating a new control file, then ran the ALTER SYSTEM command, nomounted the DB and tried to create new control files getting the error ORA-01130 database file version 18.0.0.0.0 incompatible with ORACLE version 12.2.0.0.0. Is there a way to change the compatibility level of an oracle database from 18.0.0 to 12.2.0 and have the

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