Buffering CDS View Entities
A CDS entity buffer temporarily caches the data retrieved from a CDS view entity into the shared memory of the current AS ABAP instance.
Starting with the following ABAP releases, buffering of CDS view entities is supported:
- SAP BTP, ABAP Environment 2202
- ABAP platform cloud 2202
This new object type (R3TR/DTEB) marks the last step towards feature completeness comparing the new CDS view entities with CDS DDIC-based views.
Additionally, please get informed what objects are typical candidates for buffering and check the content of ABAP table buffering.
The following table contrasts buffering of CDS DDIC-based views and new CDS view entities:
|Attribute||CDS DDIC-based view||CDS view entity|
|Buffered Object||CDS-managed DDIC view||CDS view entity|
|Definition of Buffer||Using annotations||Real syntax|
|Change of SAP-delivered objects||Requires modification||Defines additional buffer object|
|Generic Buffer: Number of key elements||Client column (MANDT) counts||Client column (MANDT) does not count|
Prepare CDS View Entity for Buffer Definitions
The following annotation makes sure your CDS view entity is prepared for buffer definitions:
This annotation is required as a first step to allow subsequent creation of buffer definition objects. The annotation itself does not lead to a buffer, but ensures the following restrictions apply:
- Views with parameters are not supported
- Views with unstable calculations are not supported (e.g. utcl_current, tstmp_current_utctimestamp)
- Session variables (other than client) can not be used
- Base objects have to be tables
- Key length > 900 bytes is not supported
- LOB key fields are not allowed
- Views without key fields can not be buffered
- Data aging in base tables is not allowed
DEFINE VIEW ENTITY BUFFER ON <entity_name> TYPE SINGLE|GENERIC|FULL LAYER CORE|LOCALIZATION|INDUSTRY|PARTNER|CUSTOMER [NUMBER OF KEY ELEMENTS <number>] // Needed for buffer type "GENERIC"
|LAYER||Multiple buffers on the same entity can be defined on different layers. Thus, it is allowed to overrule a buffer definition of a previous software layer. E.g. a buffer definition in layer CORE can be disabled by a buffer definition in layer CUSTOMER.|
|TYPE||The buffer definition types are identical to the buffering type specifications in SE11 / technical settings or values of @AbapCatalog.buffering.type. Additionally, type NONE can be specified to disable an existing buffer definition.|
|NUMBER OF KEY ELEMENTS||
The key element specification is required for generic buffering, as set for CDS DDIC-based view buffering with annotation @AbapCatalog.buffering.numberOfKeyFields.
The client column is not taken into account.
After activating the DTEB object ZDEMO_BUFFER, queries to entity DEMO_CDS_FULL_BUFFERED_VIEW are buffered on the application server.
In case of questions, please feel free to leave a comment.