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Problem with migrated rows

edited November 2022 in SQL Performance (MOSC) 11 commentsAnswered

We observe that transferring tables via datapump over a DB link takes significantly longer with Oracle 19c (19.08 to 19.15) than under Oracle 12c.

After the source schema has been reorganised (export/import), the transfer is fast for a while, but then deteriorates noticeably.

We analyzed this problem and our application creates migrated rows and for now we are not able to change this behavior within the application.

So we suspect that the behaviour of migrated rows in connection with datapump has changed either from 12c to 19c or somewhere within 19c minor revisions.

And we know that we had the migrated rows in 12c also.

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