Genric extractor on logical database

Hi
I have a requirement to create a generic datsource.
the requirement is to pull the data from logical database
the logical data base consists of tables and structures.
could pls let me know how would i create a generic datasource to pull the data from logical database.
Thanks,
D

Hi
Determining the Generic Delta for a DataSource
       1.      Choose Generic Delta.
       2.      In the subsequent dialog box, specify the delta-determining field and the type for this field.
       3.      Maintain the settings for the generic delta:
                            a.      Specify a security interval.
The purpose of a security interval is to make the system take into consideration records that appear during the extraction process but which remain unextracted (since they have yet to be saved) during the next extraction.
You have the option of adding a security interval to the upper limit/lower limit of the interval.
b.      Choose the delta type for the data to be extracted.
The delta type is used to determine how extracted data is interpreted in BW and which data targets in which it can be posted.
With the delta type additive delta, the record to be loaded for summarizable key figures only returns the change to the key figure. The extracted data is added in BW. DataSources with this delta type can supply both ODS objects and InfoCubes with data.
With the delta type New Status for Changed Records, every record to be loaded returns the new status for all key figures and characteristics. The values are overwritten in BW. DataSources with this delta type can write the data into ODS objects and master data tables.
       4.      Save your entries.
Delta transfer is now possible for this DataSource.
After generating the DataSource, you can see this from the marking for the field Delta Update on the DataSource: Customer Version screen.
Example for Determining the Selection Interval for a Generic Delta
Safety Interval Upper Limit
The delta-relevant field is a timestamp.
The timestamp that was read last is 12:00:00. Delta extraction begins at 12:30:00. The safety interval for the upper limit is 120 seconds. The safety interval for the delta request is: 12:00:00 to 12:28:00. Upon completion of the extraction, the pointer is set to 12:28:00.
Safety Interval Lower Limit
The delta-relevant field is a timestamp. After images are transferred. In other words, the record is overwritten with the status after the change in BW, for example for master data. Any duplicate records that appear have no effect upon the BW system.
The last changed timestamp is 12:28:00. Delta extraction begins at 13:00. The safety interval for the lower limit is 180secs. The safety interval for the delta request is: 12:25:00 to 13:00:00. Upon completion of the extraction, the pointer is set to 13:00:00.

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