Expert Oracle Exadata - Parent Directory

CHAPTER 2 OFFLOADING / SMART SCAN• Aggregate functions (AVG, COUNT, SUM, …)• Analytic functions (AVG, COUNT, DENSE_RANK, LAG, …)These functions return either a single row (aggregate functions) or multiple rows (analyticfunctions). Note that some of the functions are overloaded and belong to both groups. None of thesefunctions can be offloaded to Exadata. Which makes sense, because many of these functions requireaccess to the entire set of rows, which individual storage cells do not have.There are some additional functions that don’t fall neatly into any of the previously describedgroupings. These functions are a mixed bag in terms of Offloading. For example, DECODE and NVL areoffloadable, but the XML functions are not. Some of the Data Mining functions are offloadable and someare not. Also keep in mind that the list of offloadable functions may change as newer versions arereleased. The definitive list of which functions are offloadable for your particular version is contained inV$SQLFN_METADATA.SYS@SANDBOX> select distinct name, version, offloadable2 from V$SQLFN_METADATA3 order by 1,2;NAME VERSION OFF------------------------------ ------------ ---!= SQL/DS YES!= V6 Oracle YES< SQL/DS YES< V6 Oracle YES V6 Oracle YES>= SQL/DS YES>= V6 Oracle YESABS V10 Oracle YESABS V10 Oracle YESABS V6 Oracle YESACOS V10 Oracle YESACOS V73 Oracle YES. . .VSIZE V6 Oracle YESWIDTH_BUCKET V82 Oracle NOXMLCASTV11R1 Oracle NOXMLCDATA V10 Oracle NOXMLCOMMENT V10 Oracle NOXMLCONCAT V92 Oracle NOXMLDIFFV11R1 Oracle NOXMLEXISTS2V11R1 Oracle NOXMLISNODE V92 Oracle NOXMLISVALID V92 Oracle NOXMLPATCHV11R1 Oracle NOXMLQUERY V10 Oracle NOXMLTOOBJECTV11R1 Oracle NO38