
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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Tue, 02 Sep 2003 07:50:13 -0700
"Jenny -" <nat_lazy@hotmail.com>
granularity of locking