SAP ABAP Data Element RSARCHCNT64 (Archived read counter)
Hierarchy
☛ SAP_BASIS (Software Component) SAP Basis Component
   ⤷ BC-DB-DBI (Application Component) DB-Independent Database Interface
     ⤷ SBUF (Package) Table Buffers
Basic Data
Data Element RSARCHCNT64
Short Description Archived read counter  
Data Type
Category of Dictionary Type D   Domain
Type of Object Referenced     No Information
Domain / Name of Reference Type RSDB_MSIZE    
Data Type DEC   Counter or amount field with comma and sign 
Length 20    
Decimal Places 0    
Output Length 27    
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 7 ArchCnt 
Medium 9 ArchCount 
Long 15 Archive counter 
Heading 15 Archive counter 
Documentation

Definition

After a displacement, the content of the read counter of a buffered object is set to 0 and archived as follows in an archiving counter (ac):

ac := ac * Valuation factor + read counter.

The valuation factor is less than 1, which means that the frequency at which an object is accessed is valued increasingly less. The archived read counter is included in the displacement strategy.

All those objects are displaced whose

  1. Archiving counters are equal to 0
  2. Archiving counters are less than a certain limit
  3. Modification counters are greater than a certain limit and satisfy the above conditions

until the necessary free memory space is available. The read counter os the object in question has to be equal to 0.

When is displacement triggered?

At the end of a period (n requests) the current work process determines whether or not displacement should take place. The conditions for this are:

  • There is less than 3% free memory space in the table directory.
  • There is less than 3% free memory space in the data area.
  • The access quality is too poor (hit ratio < 95%).

History
Last changed by/on SAP  20040312 
SAP Release Created in 640