In the LockTag if tupleId is represented by blkno and offnum then is blockId mentioned below the same as blkno?



following is taken from postgresql-7.3.2/src/backend/storage/lmgr/readme:


"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.  "

if tupleId is represented by blkno and offnum then is blockId mentioned below the same as blkno?

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