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Datapump Import performance of large volume of data

edited Jan 9, 2020 12:10PM in Database Utilities (MOSC) 25 commentsAnswered ✓

Hi! We have built a new database of Oracle 12c (12.2) and will restore data by datapump export/import from old DB which is 10g. The database volume is huge (total size is 1.2TB) and one of the table size is about 560GB after datapump export. It took 4.5 hours to export this table with parallel = 4 (it took 9 hours without parallelism) and the rest took 3.5 hours which seems reasonable to us.

When import with parallel = 4 and excluding index (which will be rebuilt after data conversion) took 45 hours which we cannot afford. I notice import of table statistics seems very long (the import client showing "Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS" for over 20 hours. Anything we can do to optimize the performance or even speed up the import?

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