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Datapump Export of DDL is extremely slow on On-PREM

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Summary:

Datapump Export of DDL is extremely slow on On-PREM

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Source Database size : 4.5 TB

Platform: AIX

DB Version : 12.2.0.4

For Migration purpose, we are taking DDL backup using the below command and its taking 12+ hours

expdp \'/as sysdba\' directory=OCIEXP dumpfile=expdp_TST_FULL_DDL_%U.dmp logfile=expdp_TST_FULL_DDL.log FULL=Y CONTENT=METADATA_ONLY PARALLEL=4 EXCLUDE=STATISTICS EXCLUDE=TABLE_STATISTICS,INDEX_STATISTICS EXCLUDE=AUDIT_TRAILS

We tried Gathering STATS and Fixed object STATS but still its taking a long time to complete.

Could you please suggest any workaround to reduce the export backup timing?

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