SAP ABAP Data Element O2DELTA (BSP Side/Controller: Delta Handling for Transmission)
Hierarchy
☛ SAP_BASIS (Software Component) SAP Basis Component
   ⤷ BC-DWB-TOO-WAB (Application Component) Web Application Builder
     ⤷ SO2_DBLAYER (Package) mySAP Application Server Pages: Database Layer
Basic Data
Data Element O2DELTA
Short Description BSP Side/Controller: Delta Handling for Transmission  
Data Type
Category of Dictionary Type     Direct Type Entry
Type of Object Referenced     No Information
Domain / Name of Reference Type      
Data Type CHAR   Character String 
Length 1    
Decimal Places 0    
Output Length 1    
Value Table      
Further Characteristics
Search Help: Name    
Search Help: Parameters    
Parameter ID   
Default Component name    
Change document    
No Input History    
Basic direction is set to LTR    
No BIDI Filtering    
Field Label
  Length  Field Label  
Short 10 Delta 
Medium 15 Delta Handling 
Long 20 Delta Handling 
Heading 15 Delta Handling 
Documentation

Definition

If this indicator is set, the WEB Application Server will try to determine the difference between the currently displayed page and the page displayed previously in order to transmit this delta only and to provide flicker-free display.

For this purpose it uses a complex "best possible" algorithm that deactivates itself in a number of situations, for example, whenever:

  • There is no HTML document (Mime type is not the same as "text/html")
  • The browser is not IEE 5.50 (or an upgrade thereof)
  • The BSP application is stateless

The delta handler first transmits a control frameset consisting of two frames. The first frame is used to display the page for which delta handling is switched on. The second, invisible frame is used to collect the transmitted differences (deltas). The disadvantage of this is that an additional round trip is required to set up the control frameset.
Since delta handling is a costly CPU operation, it should therefore only be switched on in situations where the additional round trip and the calculation time are balanced out by the reduced transmission quantity.

In cases where the BSP page executes Document Object Model (DOM) manipulation, errors can occur on the basis of the additional frameset of the delta handler.
It is generally recommended in error situations that you switch off the delta handling when you are testing a BSP page in order to check the behavior without delta handling. If this is correct, delta handing must remain deactivated.

Use

Dependencies

Example

History
Last changed by/on SAP  20040312 
SAP Release Created in 630