Month: April 2023

The execution time for the “Select * from dba_mviews” query in a specific database is 45 seconds, which is unacceptable and requires improvement. The complexity of the dba_mviews view, particularly the inclusion of specific columns and full table scans of internal tables like SYS.SUMDELTA$ and SYS.SMON_SCN_TIME, contributes to this delay. Solutions suggested include excluding certain columns, creating a new view, or even indexing. Ultimately, optimizing refresh periods and managing data efficiently significantly reduced execution time, demonstrating the importance of these adjustments for performance enhancement.