Caching is the retention of data, usually in the application, to
minimize network traffic flow and/or disk access. With transparent persistence,
caching is often set up as part of the application work space. With this cache,
there is no need for the application to explicitly move objects from disk.
They move from disk storage automatically into program memory. This is either as
a result of a query or from traversing the graph structure. For an animation
that demonstrates this caching, see transparent
persistence (new window).
Caching for an ODBMS is similar in many respects as is caching for
object-relational mapping. The exception is that that caching for
object-relational mapping can have problems with cache
synchronization (new window). This
problem not occur with ODBMSs because the cache is tightly integrated with the
ODBMS server.
ODBMSs provide the lowest cost for development and best performance
combination when using objects because they store objects on disk and have the
transparent program integration with object programming languages. Performance
is enhanced by storing objects directly on disk which eliminates impedance
mismatch (new window). Development costs
are reduced because there is no need to program the caching for the application
programs and there is only one
model to develop (new window).
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based on 7 reviews.
based on 5 reviews.
based on 7 reviews.
