Number Range Object for a Infoobject

Question

Hi Gurus,
Can anyone explain me what is the significance of Number Range Object for a perticular infoobject and what do you mean by Buffering of those Number Range Object...
Your help will be appreciated..
Thanks a lot in advance..
Thanks,
Shalaka.

Answer 1

Hai Shalaka,
The number range buffer is used to increase performance when assigning
numbers. Instead of fetching the numbers each time from the database,
a single access to the buffer suffices. Only when the buffer is empty,
is it refilled from the database (table NRIV).
Use of the buffer has the following benefits:
· Accessing the main memory is a thousand times quicker than accessing
the database. Speed is particularly important for applications that
assign numbers frequently.
· Database accesses are always subject to the database transaction
mechanism. Once an application has assigned a number for one user, a
second user cannot assign a number until the first user has executed a
commit operation on the database. The application blocks further
assignment, and the second user has to wait, until the commit has been
executed.
· The number range buffer can also prevent deadlock situations, which
may arise from assigning different numbers in a different order.
Since the SAP kernel accesses table NRIV directly for the number range
buffer, the structure of the table must never be changed. This also
applies when adding new fields.
We can set number range buffering inSNRO t code.
Loading Master data - The number ranges buffer for the SID's resides
on the application server and reduces DB server accesses. If you set
e.g. the number range buffer for one InfoObject to 500, the system
will keep 500 sequential numbers in the memory and need not access the
database.
#####>>> whenever master data loading is done system creates SIDs, &
to create SIDs system look into a specific table, check the latest
number & generate the next no in the series, so to check this latest
no for every time ( every record) system needs to go back to database
table & generate the next no in series. when I do the buffering I
provide the whole series to system at application level so it need not
to go back to table to check the latest no & generate the next one. It
just picks up the next in available on application server.
>>>####
Please refer - SAPnote 130253
Loading Transcation data - The number range buffer for the dimension
ID's resides on the application server and reduces DB server accesses.
For example, if you set the number range buffer for one dimension to
500, the system will keep 500 sequential numbers in memory and need
not access the database
If you load a significant volume of transaction data (e.g., initial
load), increase the number range buffer. If possible, reset it to its
original state after the load in order to minimize unnecessary memory
allocation
Hope this information helps u....
Asign points if helpfull
regards
KP