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3, there are 393 functions that qualify as offloadable. The V$SQLFN_ METADATA view indicates offloadable functions through the OFFLOADABLE column, populated with YES for qualifying functions. Virtual columns—columns where the values are computed from other columns in the same table—are also offloadable, even though the values in those columns are dynamically generated at query time, so tables that have them are still eligible for Smart Scans. 28 Chapter 3 Storage Indexes Storage indexes may be the most misunderstood and confusing part of Exadata.
No mention of storage indexes appears in the execution plan output. The More, the Merrier Data distribution plays a large part in storage index performance, but that’s not the only data-related area that can impact Smart Scan execution and, as a result, storage index usage. Table size can also determine whether a storage index can be utilized. Serial direct path reads are generally utilized for large objects; small tables rarely trigger Smart Scans. How big does a table have to be to trigger a Smart Scan, and thus use a storage index?
In addition, the redundancy in ASM places the redundant data on a different storage cell from the primary source. This allows Exadata to lose a storage cell or apply patches in a rolling manner and not lose access to data. Patching and software upgrades are probably the most likely reasons for storage indexes to be built, as CELLSRV needs to be stopped before some patching operations or software upgrades can begin. The size and scope of patching or upgrades will determine the fate of the storage indexes: database server patching/upgrades won’t touch the storage cells, so storage indexes will remain intact, and patching/upgrades involving the storage tier or the entire Exadata machine will drop storage indexes.