Recommended Buffer Quality in SAP System

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 is 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.

Presentation and calendar buffers

The quality should also be above 95%. Also check available freespace and the freespace history.

Table buffers

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%.