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Explain SAP Buffers, Types, and Parameters?
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Answer Posted / inder09
Nametab (NTAB) Buffer contains data derived from tables
DDNTT(table definitions) and DDNTF (field descriptions),
stored in four individual buffer areas. These four buffers
are also known as the Repository buffer or the ABAP
Dictionary buffer. TTAB, FTAB, IRBD, SNTAB
NTAB: rsdb/ntab/entrycount
FTAB: rsdb/ntab/ftabsize
SNTAB: rsdb/ntab/sntabsize
IRBD: rsdb/ntab/irbdsize
The NTAB buffer: If the quality of these buffers falls below
95% , you should try to identify reasons for this decrease
in hit ratio.
Program Buffer (PXA) abap/buffer_size
The program buffer is used for storing ABAP program loads
before they are executed within individual work processes.
It is also known as the ABAP buffer. The PXA should show hit
ratios of 95% or more otherwise you will see, for example a
high load and generation time on your SAP instance.
Generic Table Buffer
The quality of the generic key buffer should be greater than
95% and can be upto 99%. This buffer is also known as the
generic key table buffer or the generic buffer.
CUA Buffer rsdb/cua/buffersize
The CUA buffer stores objects used by SAP GUI, including
menus and button definitions. The CUA buffer is also known
as the Menu buffer. Usually this buffer plays no significant
role concerning the performance of your SAP instance.
Roll and Paging Buffers rdisp/ROLL_SHM and rdisp/PG_SHM
The parameters rdisp/ROLL_SHM and rdisp/PG_SHM are used to
allocate the roll and paging buffer in 8KB blocks.
Screen Buffer zcsa/presentation_buffer_area
The screen buffer or Dynpro buffer stores generated screens,
the so-called Dynpro load. Usually this buffer plays no
significant role concerning the performance of your SAP
instance.
Calendar Buffer zcsa/calendar_area
The SAP calendar buffer stores all defined factory and
public holiday calendars.
OTR Buffer
The Online Text Repository (OTR) buffer contains texts used
by Business Server Pages, Exception Builder and HTTP
Services. Usually this buffer plays no significant role
concerning the performance of your SAP instance.
Export/Import Buffer
The Export/Import buffer is used to store data that must be
available to several work process. The system fills or reads
the buffers using the ABAP command. EXPORT TO / IMPORT FROM
SHARED BUFFER. Usually this buffer is only of interest for
individual processes, such as in some SAP APO functions.
Exp./Imp.SHM
The Export/Import-Shared-Memory-(ESM)-buffer contains data
put there by the using the ABAP statement EXPORT TO SHARED
MEMORY. This buffer might become a performance bottleneck
when you see heavy swapping activity for this buffer. If you
see no swaps, the buffer is perfect.
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