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Apply process dead slow in logical standby after upgrade 12.2 to 19.3

Apply process slow in logical standby after upgrade 12.2 to 19.3 with the following Query and output:

BUILDER ORA-44604: Barrier synchronization on DDL with XID 35.19.2166035 (waiting on 6 transactions)

APPLIER ORA-16125: large transaction 10 8 7158672 is waiting for more data

APPLIER ORA-16125: large transaction 2 5 2495157 is waiting for more data

APPLIER ORA-16125: large transaction 24 29 2646351 is waiting for more data

PREPARER ORA-16127: stalled waiting for additional transactions to be applied

COORDINATOR ORA-16116: no work available

PREPARER ORA-16127: stalled waiting for additional transactions to be applied

PREPARER ORA-16127: stalled waiting for additional transactions to be applied

PREPARER ORA-16127: stalled waiting for additional transactions to be applied

PREPARER ORA-16127: stalled waiting for additional transactions to be applied

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