Performance improvements

Refreshing a SET USING column where SET USING is set to a constant value such as null has been optimized.

REFRESH_COLUMNS

Refreshing a SET USING column where SET USING is set to a constant value such as null has been optimized. Compared to previous releases, calling REFRESH_COLUMNS in REBUILD mode now performs significantly faster when it repopulates a SET USING column with constant values.

One exception applies: this optimization does not apply to SET USING subqueries such as SELECT null.

Backup/restore

Better manifest processing and garbage collection have significantly improved performance of vbr backup and restore operations.