High Buffer Quality

Definition

The following describes how the buffer quality of the SAP buffers should be in a SAP System with good performance.

Repository buffers (nametab buffers)

The qualities of the Repository buffers can reach 99.9% in a system that has been running for a few days. If the buffer quality is less than 95%, you should investigate the situation further.

Check the:

Available freespace

Available directories
Object swaps
Buffer history.

Program buffer

The program buffer contains the generated ABAP programs (load).

Critical effects on the program buffer

Transports

Every time a new source is transported into the system using the R3trans program, all entries in the program buffer are invalidated, and all other buffers are cleared (equivalent to the $SYNC command). Unlike the other buffers, the program buffer is not empty after transport, but is filled with invalid programs.

Therefore, it is better to execute as few transports as possible and to collect data to do several transports at once. For more information, see Program Buffer.

Presentation and calendar buffers

The quality should also be above 95%. Also check available freespace and the freespace history. For more information, see SAPgui Buffers and SAP Calendar Buffer.

Table buffers

As mentioned above, the quality of the single key buffer increases very slowly from system startup. Therefore, bad quality (< 90%) should only be of concern if there is no freespace left in the buffer.

The quality of the generic key buffer should be greater than 95% and can be up to 99%. For more information, see Table Buffers