Data Segments
Definition
DART extracts are organized in segments. A data segment contains a collection of fields from SAP tables. A data segment may hold master data or data from an application document. A segment is a collection of all the records of one type. A segment may contain data from a single SAP database table, or it may combine related data from multiple tables.
The following diagram illustrates the arrangement of segments in the data extract.
Use
The set of segments that are defined in DART determines which data can be extracted with DART, meaning that you can only extract and retain data for segments that are defined in DART.
DART supplies a large set of predefined segments. These include multiple segments for many of the major SAP application areas.
The technical names of all data segments provided by SAP start with TXW_. For example, one of the segments, namely TXW_MM_POH, contains Purchase Order document header data. Another segment, TXW_MM_POP, contains Purchase Order line item data.
If you wish to configure DART to extract data from additional tables or fields, that is, from tables or fields not included in the SAP-provided set of segments, then you need to add segments or expand the existing segments. You may need to create a customer enhancement to handle this data. See the topic of adding segments and fields through customer enhancements .
DART uses data segments to organize the data it extracts in the sequential files it creates. DART separates transaction data segments from master data segments. Within those, segments are organized by application area.
Integration
A data segment in DART must be based on an existing structure in the ABAP Data Dictionary. The data segment in DART uses the same name as the structure in the Data Dictionary, and it also contains the same fields as the structure.
A data segment may contain a mixture of fields from multiple SAP tables.
The following illustration shows how the fields in a DART segment correspond to a structure in the Data Dictionary, which, in turn, corresponds to fields in tables in the database
You must create the necessary Data Dictionary structures for every segment you create, as part of the process of adding new segments or adding fields to existing segments .
Structure
A segment definition contains the fields to be extracted and the tables from which to extract these fields.
A segment definition also specifies other attributes of the segment, such as indexes on one or more of its fields.
Defining indexes on fields in a segment can enhance the performance of data extract views .
The SAP-provided data segments have predefined index fields to enhance the performance of the SAP-provided data views. You may add or change the index fields on these predefined data segments in the same way that you can define indexes for data segments you create.
DART provides a predefined control totals key figure for the FI documents line item segment: it adds all the amounts in the local currency amount field for this segment. DART also provides a report to compare the sums of this key figure in the extract file with the current amount in the database. You can use this report, for example, to see if any FI documents have been posted since the data has been extracted. This can help you verify the integrity of the data in the extracted file, because for a certain period, after it has been closed, there should not be any postings that have not been retained in the extract file.