Lucent Technologies CentreVu Version 8 Report Designer User Manual page 220

How CentreVu® CMS Stores and Retrieves Data
How CentreVu CMS Retrieves Data
Actually, when you design a report, you normally set up the row selection
so that the users running the report can choose the rows in the report's
input window. For example, to run the report in the above figure, you
would set up the row selection so users would fill out a Report Input
window that asked them for a Split number.
As mentioned earlier, CentreVu CMS uses indexes to create a structure
for storing data. Similarly, CentreVu CMS uses these indexes to search
for data. Indexes allow CentreVu CMS to find data much faster than if
data were stored more randomly. Therefore, when you design a report,
the rows of data for the report should be defined on the basis of index
values.
The indexes for each standard table are fixed and cannot be changed,
deleted or added to. However, if you define a custom table in the
CentreVu CMS database through INFORMIX
indexes desired for that new table. See the "SQL Query Basics" chapter
for instructions on creating new database tables.
As another example of how CentreVu CMS retrieves report data, if you
want a custom intrahour interval split report that lists, by intrahour
interval, data for a split in a single day, then you must tell CentreVu CMS
to access the hsplit (Historical Intrahour Interval Split) table. You
must then assign the appropriate database items to the fields. When you
run the report, CentreVu CMS finds the columns of data associated with
the database items in the hsplit table (see the following figure).
*INFORMIX is a registered trademark of Informix Software, Inc.
CentreVu Report Designer Version 8 User Guide
*
SQL, you can define any
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