Appeal No. 2002-2218
Application 09/322,698
which of necessity require write operations. The first paragraph
of the Summary of the Invention at column 3 of Mohan clearly is
in the context of log sequence numbers (LSNs) relating to
identifiers associated with modifications to data in the same
manner as just noted. Thus, the focus of Mohan's teachings does
not appear to be upon any read transactions.
In fact, as noted by appellants at the top of page 12 of the
principal brief on appeal, Mohan specifically teaches at column
6, lines 62 and 63 that "Read-only transactions do not do any
logging." To the extent such read-only operations convey the
absence of updates or changes or modifications to a database,
this portion of Mohan may be considered to teach away from the
use of read-identifiers and their storage, where the read
identifiers reflect a time at which a reading transaction as
claimed first accesses an object in a database and then later is
used to determine an age of an oldest active reading transaction.
Based upon the quoted teaching, there appears to be no log
sequence number (LSN) generated in Mohan for read-only
operations. Lastly, column 6, lines 60-62 essentially defines
updates as an "update transaction writes a ... record just before
performing its first update."
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