SAP Note 1005901 related to MM

Question

Hello friends,
                    Can anyone explain me the below sap note 1005901 (MM module , tcode :- MB5B). I am not able to understand perfectly...
16.08.2010 Page 1 of 4
SAP Note 1005901 - MB5B: Performance problems
Note Language: English Version: 3 Validity: Valid Since 05.12.2006
Summary
Symptom
o The user starts transaction MB5B, or the respective report
RM07MLBD, for a very large number of materials or for all materials
in a plant.
o The transaction terminates with the ABAP runtime error
DBIF_RSQL_INVALID_RSQL.
o The transaction runtime is very long and it terminates with the
ABAP runtime error TIME_OUT.
o During the runtime of transaction MB5B, goods movements are posted
in parallel:
- The results of transaction MB5B are incorrect.
- Each run of transaction MB5B returns different results for the
same combination of "material + plant".
Other terms
MB5B, RM07MLBD, runtime, performance, short dump
Reason and Prerequisites
The DBIF_RSQL_INVALID_RSQL runtime error may occur if you enter too many
individual material numbers in the selection screen for the database
selection.
The runtime is long because of the way report RM07MLBD works. It reads the
stocks and values from the material masters first, then the MM documents
and, in "Valuated Stock" mode, it then reads the respective FI documents.
If there are many MM and FI documents in the system, the runtimes can be
very long.
If goods movements are posted during the runtime of transaction MB5B for
materials that should also be processed by transaction MB5B, transaction
MB5B may return incorrect results.
Example: Transaction MB5B should process 100 materials with 10,000 MM
documents each. The system takes approximately 1 second to read the
material master data and it takes approximately 1 hour to read the MM and
FI documents. A goods movement for a material to be processed is posted
approximately 10 minutes after you start transaction MB5B. The stock for
this material before this posting has already been determined. The new MM
document is also read, however. The stock read before the posting is used
as the basis for calculating the stocks for the start and end date.
If you execute transaction MB5B during a time when no goods movements are
posted, these incorrect results do not occur.
Solution
The SAP standard release does not include a solution that allows you to
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SAP Note 1005901 - MB5B: Performance problems
process mass data using transaction MB5B. The requirements for transaction
MB5B are very customer-specific. To allow for these customer-specific
requirements, we provide the following proposed implementation:
Implementation proposal:
o You should call transaction MB5B for only one "material + plant"
combination at a time.
o The list outputs for each of these runs are collected and at the
end of the processing they are prepared for a large list output.
You need three reports and one database table for this function. You can
store the lists in the INDX cluster table.
o Define work database table ZZ_MB5B with the following fields:
- Material number
- Plant
- Valuation area
- Key field for INDX cluster table
o The size category of the table should be based on the number of
entries in material valuation table MBEW.
Report ZZ_MB5B_PREPARE
In the first step, this report deletes all existing entries from the
ZZ_MB5B work table and the INDX cluster table from the last mass data
processing run of transaction MB5B.
o The ZZ_MB5B work table is filled in accordance with the selected
mode of transaction MB5B:
- Stock type mode = Valuated stock
- Include one entry in work table ZZ_MB5B for every "material +
valuation area" combination from table MBEW.
o Other modes:
- Include one entry in work table ZZ_MB5B for every "material +
plant" combination from table MARC
Furthermore, the new entries in work table ZZ_MB5B are assigned a unique
22-character string that later serves as a key term for cluster table INDX.
Report ZZ_MB5B_MONITOR
This report reads the entries sequentially in work table ZZ_MB5B. Depending
on the mode of transaction MB5B, a lock is executed as follows:
o Stock type mode = Valuated stock
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SAP Note 1005901 - MB5B: Performance problems
- For every "material + valuation area" combination, the system
determines all "material + plant" combinations. All determined
"material + plant" combinations are locked.
o Other modes:
- Every "material + plant" combination is locked.
- The entries from the ZZ_MB5B work table can be processed as
follows only if they have been locked successfully.
- Start report RM07MLBD for the current "Material + plant"
combination, or "material + valuation area" combination,
depending on the required mode.
- The list created is stored with the generated key term in the
INDX cluster table.
- The current entry is deleted from the ZZ_MB5B work table.
- Database updates are executed with COMMIT WORK AND WAIT.
- The lock is released.
- The system reads the next entry in the ZZ_MB5B work table.
Application
- The lock ensures that no goods movements can be posted during
the runtime of the RM07MLBD report for the "material + Plant"
combination to be processed.
- You can start several instances of this report at the same
time. This method ensures that all "material + plant"
combinations can be processed at the same time.
- The system takes just a few seconds to process a "material +
Plant" combination so there is just minimum disruption to
production operation.
- This report is started until there are no more entries in the
ZZ_MB5B work table.
- If the report terminates or is interrupted, it can be started
again at any time.
Report ZZ_MB5B_PRINT
You can use this report when all combinations of "material + plant", or
"material + valuation area" from the ZZ_MB5B work table have been
processed. The report reads the saved lists from the INDX cluster table and
adds these individual lists to a complete list output.
Estimated implementation effort
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SAP Note 1005901 - MB5B: Performance problems
An experienced ABAP programmer requires an estimated three to five days to
create the ZZ_MB5B work table and these three reports. You can find a
similar program as an example in Note 32236: MBMSSQUA.
If you need support during the implementation, contact your SAP consultant.
Header Data
Release Status: Released for Customer
Released on: 05.12.2006 16:14:11
Master Language: German
Priority: Recommendations/additional info
Category: Consulting
Primary Component: MM-IM-GF-REP IM Reporting (no LIS)
The Note is release-independent
Thank you.

Answer 1

SAP suggests you to build a pre-calculated data table and a z-report to solve the problem of performance getting poor of transaction MB5B. They give suggestions to write programs that fill the new database table and a report to substitute MB5B transaction
First download and install in development or sandbox system the transport request of [Note 32236 - Incorrect stock qty or stock value in material master|https://service.sap.com/sap/support/notes/32236] and check the included reports which are very similar.
Regards,
Raymond