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ABENCDS_VIEW_PUFFERING - CDS VIEW PUFFERING

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- Table Buffering of CDS Views

The following CDS annotations can define table buffering for a CDS view associated with a CDS managed DDIC view:

• @AbapCatalog.buffering.status defines whether and how table buffering is allowed.

• @AbapCatalog.buffering.type determines the buffering type.

• @AbapCatalog.buffering.numberOfKeyFields determines the number of key fields covered if generic buffering is used.

Table buffering of CDS views is done for the associated CDS managed DDIC view and the same prerequisites apply as for DDIC database views in ABAP Dictionary. To meet these prerequisites, a CDS view can only be buffered if the following applies:

• It cannot contain any views
  (DDIC database views or CDS views) and no CDS table functions as data sources.

• It cannot have any input parameters.

• A client-specific view can use $session.client as the only session variable and must use it directly. This also allows the annotation @ClientHandling.algorithm:#SESSION_VARIABLE to be specified to determine client handling. A cross-client view must not use any session variables.

• Key fields cannot contain null values.

• The required key fields must be listed directly in the SELECT list. Key fields that only occur as arguments of expressions cannot be evaluated.

Only the key fields of the CDS managed DDIC view are respected in SAP buffering of CDS managed DDIC views. By default, these are not the key elements of the CDS entity defined using KEY (unless the value true is specified for the view annotation AbapCatalog.preserveKey.

Note

In client-specific views, the client column must be explicitly included or added to the number in the specification for the annotation @AbapCatalog.buffering.numberOfKeyFields.

Example

Enables full buffering for a CDS view.

@AbapCatalog.sqlViewName: '...'
@AbapCatalog.Buffering.status: #ACTIVE
@AbapCatalog.Buffering.type: #FULL
  define view ...
   as select from ...
   { ... }

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