索引节点导出的块头信息解释
rdba - relative database block address of the branch block (file no/block no) scn – system change number of the block when last changed seq – number of block changes type – block type seg/obj – object id typ – segment type (index) Itl – Interested transaction Slots (default 2 for leaf blocks) including slot id, transaction id, undo block address, flag and locking info and scn of transaction[@more@]kdxcolev: index level (0 represents leaf blocks) kdxcolok: denotes whether structural