Various systems and methods are describe for determining dynamically generated
content to be invalidated as a result of changes to underlying data. In one method,
invalidation processing is performed using a delayed version of the database that
reflects the state of the database at the beginning of a preceding processing cycle,
and an update log that reflects all updates since the beginning of the preceding
processing cycle. In another method, invalidation processing is performed by locking
a database which is locked during processing so as to reflect the state of the
database at the beginning of processing, and an update log that reflects all updates
to the database since the beginning of the preceding processing cycle. In another
method, invalidation processing uses the database while it is freely updated during
said processing, and the update log of the database.
