This illustration shows the
Oracle8i Cache environment in more detail:
-
The client tier shows three PCs being used as Web browsers. In addition,
it shows a PC that is running Cache Manager, the graphical user interface
for Oracle Database Cache.
-
The middle tier shows one node containing a Web server, an application,
the cache router, and a cache. Requests flow from the client tier to the
middle tier. In the middle tier, the cache router determines whether the
data is in the cache. If so, it routes the request to the cache. If
not, it routes the request to the origin database.
-
The database tier shows one node as the database server, which contains
the origin database.
The illustration also shows communication between Cache Manager and both
the middle-tier cache and the origin database.