"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."
I dont see any field called tupleId in LockTag..does it have another name?
Also, "(we currently never do this)"--> does this mean that we currently can acquire tuplelevel(row level) locks in postgresql?
Thank you
Jenny
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