What sys.ku$ stands for?

There are some types with "sys.ku$_" prefix, b开发者_JS百科ut is that "ku" abbreviation of something? Just nice to know things :)

My suspicion: They're struct definitions in the Oracle kernel, as the V$ objects are public interfaces to dynamic performance information, the GV$ objects are the cross-instance version of the V$ objects, and the X$ objects are the actual data in the kernel. (Think of them as a linked-list of structs, as that's how a lot of them seem to be implemented. Oracle's doesn't call them, for example, "LRU chains" by accident.)

My opinion: You don't need to know what they are, and you should never ever depend on them, because Oracle can and will changed them without any notification.

Maybe it stands for "knowledge unit"? In Knowledge Management systems:

a KU is anything worth storing that may help things to be done better in the future: help, best practice guidelines etc.

Anyway I don't have any further ideas about this abbreviation etymology :)

A system defined Type.

Not sure what the Ku stands for.

its collection.

SELECT KU$OBJECT_NUMSET(1,2,4) FROM DUAl;

ANS : 1 2 3

Blockquote