granularity of locking - Mailing list pgsql-general

From Jenny -
Subject granularity of locking
Date
Msg-id BAY1-F61vX4pE2iNlg40001bc47@hotmail.com
Whole thread Raw
List pgsql-general
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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