![]() SQL> alter pluggable database all open upgrade ![]() Start CDB and all PDBs in upgrade mode: $. Set ORACLE_HOME and ORACLE_SID environment variables for 18c Grid home: u01/app/grid2 -e -l /u01/app/grid2/cfgtoollogs/mgmtua -b mgmtdowngrade -r $ $ORACLE_HOME/perl/bin/perl $ORACLE_HOME/rdbms/admin/ -d ![]() SQL> alter pluggable database all open downgrade ĭowngrade 19c Management Database using the following command syntax, where /u01/app/grid2 is the Oracle base for Oracle Grid Infrastructure 19c: Start CDB and all PDBs in downgrade mode: $. Set ORACLE_SID environment variable for 19c Grid home: $ cp $ORACLE_HOME/oracore/zoneinfo/timezone_number.dat /u01/app/18.0.0/grid/oracore/zoneinfo/timezone_number.datĭowngrade application schema using the following command syntax from 19c Grid home: $ $ORACLE_HOME/bin/mgmtua downgrade -local -oldOracleHome /u01/app/18.0.0/grid -skipSystemSchemaDowngradeĭisable and stop MGMTDB resource from 19c Grid home: $ cd $ORACLE_HOME/binĭowngrade system schema using the following procedure: ![]() $ cp $ORACLE_HOME/oracore/zoneinfo/timezlrg_number.dat /u01/app/18.0.0/grid/oracore/zoneinfo/timezlrg_number.dat Manually copy the most recent time zone files from 19c Grid home to 18c Grid home, where timezlrg_number is the name of the most recent timzlrg file and timezone_number is the name of the most recent timezone file: ![]()
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