"If we are setting a table level lock
both the blockId and tupleId (in an item pointer this is called
the position) are set to invalid, if it is a page level lock the
blockId is valid, while the tupleId is still invalid. Finally if
this is a tuple level lock (we currently never do this) then both
the blockId and tupleId are set to valid specifications. "how do we check whether blockId and tupleId of LOCK.tag are valid or invalid?
is blockId same as tag.objId.blkno? what field in LOCK.tag is tupleId?
thanks
jenny
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