0 and Enterprise
JavaBeans (EJB) v1.0
??? Publish/subscribe messaging based on Advanced Queuing
??? Online index rebuild and reorganization
??? Database Resource Manager (DRM)
??? Use of a standby database for queries
??? Internalization of the replication packages used to apply transactions at the
remote sites
Oracle9i continued this trend, with the introduction of Real Application Clusters,
which extended the benefits of Oracle Parallel Server to OLTP applications. Since
Oracle Database 10g, the capabilities of Real Application Clusters support deployment
to a new computing model, grid computing. But many of the capabilities that
enable OLTP with Oracle have been core to the database product for many years.
The remainder of this chapter examines many of these features in more depth.
Architectures for OLTP
Although all OLTP systems are oriented toward the same goals, there are several different
underlying system architectures that you can use for the deployment of OLTP,
including the traditional two-tier model, a three-tier model, and a centralized model
that encompasses the use of the Web and the grid.
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