User`s guide

• 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

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Accessing Data Sources