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Slow performance of "one pass ndv" on 19c

in Database Tuning (MOSC) 15 commentsAnswered

Product => Oracle Database 19.19 on Exadata C@C

While doing a performance testing of one of our application batch job, we noticed that the job is running around 4x slower on 19.19 running on Exadata C@C as compared to previous setup that had a 12.1.0.2 database running on RHEL 7.9 The application job is a typical bulk data loading job that is loading a set of database tables using a set of source data files and gathers statistics on those tables. None of the target tables are partitioned. While we have observed that many of the SQL statements accessing some of the largest tables, are running slower, the

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