
• When you open a Pervasive database, Crystal Reports opens the entire database and loads
information about all the tables in the database. To do this, Crystal Reports must reserve a large
section of your computer's memory, called a buffer, in advance. Computer memory restrictions limit
this buffer to 65,536 bytes (64K). This restricts the size of your Pervasive database to about 80
tables, depending on the number of fields in each table.
Pervasive DDF files
Crystal Reports does not determine the definitions of Pervasive data files directly from the data files
themselves. It needs a set of Pervasive Data Definition Files (.DDF) that contain file, field, and index
information. Crystal Reports uses Wbtrvdef.dll and Sbtrvdef.dll to parse these DDF files. The following
are the required DDFs which must all reside in the same directory:
• File.ddf
• Field.ddf
• Index.ddf
A set of DDFs normally contain definitions for multiple Pervasive data files. Once one of the DDFs is
selected when creating a new report, Crystal Reports immediately adds all the data files defined in that
DDF into the report. Crystal Reports also takes the path defined in the DDFs as the default path of the
data files. The DDFs and data files can reside in different locations.
Note:
Be sure to study your Pervasive documentation for more information on Pervasive DDFs and on
configuring the Pervasive engine.
A.2.4.6 Exchange
Exchange is Microsoft's successor to MS Mail. Exchange, however, includes not only e-mail, but also
management of group scheduling, electronic forms, groupware, and Internet connectivity. An Exchange
folder can contain standard notes (mail), files, and instances of Exchange forms. All of this data is stored
in the Exchange Information Store.
Note:
Exchange 2000 can be accessed through ADO.
Crystal Reports can report on data contained in the Exchange Information Store. Exchange data sources
available for reporting include:
• Message Tracking Logs
• Address Lists
• Personal Address Books
• Global Address Lists
• Distribution Lists
2012-03-14649
Accessing Data Sources
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