Oracle 23c New Features for DBA'sI have been asked by one of colleague (Vasu) about a weird issue, that the query returns rows in sort order in one database not in the other database.
Without having much hassle, by running dbms_xplan.display_cursor('sql_id',NULL,'ADVANCED) mode tell's us the optimizer parameter "_gby_hash_aggregation_enabled" is having different values in each database. Which is mean to perform the sort group by or hash group by operation.
To simulate the issue, I just did the following, a quick check on v$session row_wait_obj# column with parameter false/true.
The result show rows in non sorted for true, (means performed a hash group by operation) where in with false the rows are in sorted order (sort group by has been performed)
-Thanks
Suresh
Follow Me!!!