Koichi Suzuki <[EMAIL PROTECTED]> writes:
> I need to know where such "lock marks" are stored in the source level.

A row lock is represented by storing the locking transaction's ID in
xmax and setting the HEAP_MARKED_FOR_UPDATE infomask bit.  The bit is
needed to distinguish this from the case where the transaction is
deleting the tuple.

                        regards, tom lane

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