The survey guide ensures staff are up to date with regulatory compliance, enables quick searching, offers color and page formatting for teaching page handouts, and references information with logical page
Parameter Meaning Setting NumObjects Number of objects in the PageSize database 100,000 Size of a logical or physical 4,096 bytes page ObjectsPerPage Number of objects per 20 objects physical or logical page ClusteringProb Probability that an object is 1, 0.9, in its clustered position 0.75, 0.50 Our simulation model provides a simple yet flexible mechanism for describing OODBMS workloads.
To allow different degrees of object access locality to be explored in our experiments, the concept of logical page locality is used to describe the number of objects that a transaction will access per logical page.
NumObjects / ObjectsPerPage ??--with physically adjacent pages having consecutive physical ids.(10) The mapping of objects to physical pages is defined to be perfect (under the workload model of Section 3) in the case where the [i.sup.th] logical page corresponds to the [i.sup.th] physical page; under this mapping the database is said to be perfectly clustered, as consecutively numbered objects are clustered together on disk.
Under this mapping, both the logical and [i.sup.th] logical page maps to the [i.sup.th] physical page.
Both the physical page locality and the TransPages parameter are derived quantities that depend on the logical page locality and the clustering probability.
Finally, we note that although both the TransPages parameter and the physical page locality can be controlled by varying either the logical page locality or the clustering probability, our model includes both of these parameters.
PostSearch OS also debuts three new features, record selection by keywords, automated logical page
breaking, and removal of hard carriage returns within fields of Dialog TAGed records.