Most useful presentation of OOW so far, from Hermann Baer of Oracle on improvements in partitioning features in 12c – and there are lots of useful ones, including:
Online move of a partition – so easy to compress a partition when it has reached its final “read-only” state
multiple partition maintenance in one operation – e.g. merge 3 monthly partitions into one quarterly partition, or split one partition into 24 (think about “how do I partition a non-partitioned table”, and 12c has just made it easier and quicker – exchange it into an empty partitioned table, then do one massive split).
partial indexing – define which partitions of a partitioned table should be included in the indexes you create on the table – and the optimizer also knows that different partitions need different plans (an enhancement of “table expansion”.
interval-reference partitionining – you can create an interval partitioned table, and use ref-partitioning to create child (and further decendent) tables, and their partitions will automatically be generated, truncated, and dropped as the parent is extended, truncated or dropped (needs enabled foreign key constraints).
Lots more details – and lots of stress-testing to be done – but I’m off to hear “the optimizer lady” talk about hints.
Oracle has a “safe harbour” slide at the start of all presentations about future developments pointing out that the information presented is an indication of direction, but not guaranteed to make it into production.