ARTICLE
Data Consistency
When external data is changed by application programs, it must be
ensured that the data is consistent after changes have been made. This
is particularly the case for the processing of data in the database. The
time span during which a consistent data status is transferred to
another consistent status is known as a LUW ( Logical Unit of Work
). If an error occurs during a LUW, it is possible to reset all changes
made up to this point and regenerate the data in its original consistent
status (rollback). When a new consistent status has been reached, this
new status can be set and a new LUW can be opened (Commit).
In an AS ABAP there are two type
of LUWs:
Database LUWs that are realized by the
database system
SAP LUWs , that are realized using special ABAP
proramming techniques
Accordingly, there are two lock types that are of significance:
Database locks that are set by the system
SAP locks that are set using special ABAP
proramming techniques
Finally, the authorizations of a user are
important for data consistency for accessing data whose check has an
ABAP statement .
Documentation extract taken from SAP system, � Copyright SAP AG. All rights reserved