Delta get once and delta request wise?

hi friends,
what scenerio we use delta get once and delta by request at DTP in BI 7.0? i studied many threads, i didnt understand , get delta once some snapshot like? what is the meaning?
can u give me any example , its great?
regards
ss

Indicator: Only Get Delta Once
Source requests of a DTP for which this indicator is set are only transferred once, even if the DTP request is deleted in the target.
Use
If this indicator is set for a delta DTP, a snapshot scenario is built.
A scenario of this type may be required if you always want an InfoProvider to contain the most up-to-date dataset for a query but the DataSource on which it is based cannot deliver a delta (new, changed or deleted data records) for technical reasons. For this type of DataSource, the current dataset for the required selection can only be transferred using a 'full update'.
In this case, a DataStore object cannot usually be used to determine the missing delta information (overwrite and creation of delta). If this is not logically possible because, for example, data is deleted in the source without delivering reverse records, you can set this indicator and perform a snapshot scenario. Only the most up-to-date request for the DataSource is retained in the InfoProvider. Earlier requests for the DataSource are deleted from the (target) InfoProvider before a new one is requested (this is done by a process in a process chain, for example). They are not transferred again during the DTP delta process. When the system determines the delta when a new DTP is generated, these earlier (source) requests are seen as 'already fetched'.
Setting this indicator ensures that the content of the InfoProvider is an exact representation of the source data.
Dependencies
Requests that need to be fetched appear with this indicator in the where-used list of the PSA request, even is they have been deleted. Instead of a traffic light you have a delete indicator.
Get Data by Request
This indicator belongs to a DTP that gets data from a DataSource or InfoPackage in delta mode.
Use
If you set this indicator, a DTP request only gets data from an individual request in the source.
This is necessary, for example, if the dataset in the source is too large to be transferred to the target in a single request.
Dependencies
If you set this indicator, note that there is a risk of a backlog: If the source receives new requests faster than the DTP can fetch them, the amount of source requests to be transferred will increase steadily.
Source : https://forums.sdn.sap.com/click.jspa?searchID=5462958&messageID=3895665
Re: Diff between Only Get Delts Once and Get Data by Request
Check this blog as well : /people/community.user/blog/2007/06/21/sap-netweaver-70-bi-data-transfer-process-with-147only-get-delta-once148

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Regards
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Edited by: Josef L. on Mar 20, 2009 7:44 PM

hi venkat,
whenever you load a delta from ods to cube , whatever the data changed in ods since last delta will be updated, hence from you case, both req1 and req2 will be loaded to cube.
Assign Points if useful
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HI,
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Happy New Year wishes to all.
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<i>Hi Satish,
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Dont Forget to assign Points.</i>
Dude, you just repeated my answer I gave a few hours ago. Are you hungry for points?

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Regards,
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Hi,
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Hi,
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Brad

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Delta get once and delta request wise?

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