Appeal No. 2003-1062
Application No. 09/004,265
sometimes, instead of running a query on the database itself, a
part of that database will be copied to another location and the
query will be run on that copy. The copy is known as a “view.”
Concurrency becomes important to ensure that different parties,
using different copies, will deal with consistent data, i.e., the
“concurrency” of the data must be maintained.
In order to provide concurrency, the instant invention
employs a “locking” technique, i.e., access is blocked to certain
data so that only one party at a time can modify the locked data.
When a process seeks to generate a “view,” that process
identifies the data of interest within the database. That data
is termed a “tuple.” The process requests a lock on the tuple.
Responsive to this request, another process will lock not only
the tuple, but also a “superset” of the tuple. A “superset” is a
set which contains the tuple, but also contains additional data,
or tuples.
Representative independent claim 1 is reproduced as follows:
1. A system, comprising:
a database;
means for generating views of the database, said views
containing view tuples; and
-2–
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