How To Fix R7I333 - Multidimensional clustering for DataStore objects

SAP Error Message - Details

• Message type: E = Error

• Message class: R7I - InfoProvider

• Message number: 333

• Message text: Multidimensional clustering for DataStore objects

What causes this issue?

You want to select InfoObjects for multidimensional clustering (MDC) of
the DataStore object.

System Response

Multidimensional clustering (MDC) physically organizes a table in
blocks. Each block only contains data records with the same values in
the MDC dimensions. The size of a block is fixed and corresponds to the
EXTENTSIZE of the tablespace. This is at least 2 pages. If a page is
16K, a block requires at least 32K of memory.
Multi-dimensional clustering can significantly improve the performance
of database queries. If the queries contain restrictions on MDC
dimensions, only the blocks of the table that contain the corresponding
dimension values must be read. For the data access block indexes are
used, which are considerably smaller than conventional row indexes and
can therefore be searched more quickly.
The deletion performance also benefits from the physical organization of
an MDC table and from the easier maintenance of smaller block indexes.

How to fix this error?

Select one or more InfoObjects as MDC dimensions by assigning the
InfoObjects sequential status numbers beginning with 1.
Follow these steps when selecting InfoObjects:
Select InfoObjects that you frequently use as restrictions in your
queries. For example, a time characteristic that you often use as a
restriction in your queries is well-suited as an MDC dimension.
Select InfoObjects with a low cardinality. For example, the time
characteristic 0CALMONTH instead of 0CALDAY.
You cannot select more than three InfoObjects.
Assign the status numbers according to the following criteria:
Sort the InfoObjects according to how frequently they are used in BI
queries. That is, assign the lower status number to the InfoObject that
is used more frequently in BI queries.
Sort the InfoObjects according to their selectivity. That is, assign the
lower status number to the InfoObject with the higher selectivity.
Note that for every combination of values in the MDC dimensions at least
one block is created that has at least 32K of memory. This memory area
is allocated independent of the number of data records that have the
same combination of values in the MDC dimensions. If the number of data
records with the same combination of values is not sufficient to
completely fill the block, the free memory remains unused. This is
because data records with a different combination of values in the MDC
dimensions cannot be written to the block.
If in the selected InfoObjects there are only a few data records in the
DataStore object for each combination that arises in the DataStore
object, and most of the blocks therefore have unused, free memory, an
unnecessarily large amount of memory space is used for the table. The
performance of the database queries therefore decreases, because many,
only partially filled pages have to be read.
It is not necessary to create additional secondary indexes on the MDC
dimensions. The database uses the MDC block indexes for database
queries.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message R7I333 - Multidimensional clustering for DataStore objects ?

  The SAP error message R7I333 typically relates to issues with multidimensional clustering (MDC) for DataStore Objects (DSOs) in SAP BW (Business Warehouse). This error can occur during the activation or processing of data in a DSO, particularly when the system encounters problems with the underlying database structure or data integrity.
  Cause:
  
  Data Consistency Issues: There may be inconsistencies in the data being loaded into the DSO, which can lead to problems during the activation process.
  Database Locking: If the DSO is locked by another process or transaction, it can prevent the activation of data.
  Configuration Issues: Incorrect settings in the DSO configuration or in the underlying database can lead to this error.
  Insufficient Resources: Lack of memory or other system resources can cause the MDC process to fail.
  Corrupted Data: If the data being processed is corrupted or not in the expected format, it can trigger this error.
  
  Solution:
  
  Check Data Consistency: Ensure that the data being loaded into the DSO is consistent and adheres to the expected format. You may need to validate the data source and the transformation rules.
  Release Locks: Check if there are any locks on the DSO and release them if necessary. You can use transaction codes like SM12 to view and manage locks.
  Review DSO Configuration: Verify the configuration settings of the DSO and ensure they are correctly set up for multidimensional clustering.
  Monitor System Resources: Check the system resources (memory, CPU) to ensure that there are enough resources available for the MDC process to complete successfully.
  Reprocess Data: If the data is corrupted, you may need to reprocess the data load. This could involve deleting the problematic data and reloading it.
  Check for Notes and Patches: Look for any SAP Notes or patches related to this error message. SAP frequently releases updates that may address known issues.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as:
  
  RSA1: Data Warehousing Workbench
  SM37: Job Monitoring
  SM12: Lock Management
  
  
  SAP Notes: Search the SAP Support Portal for notes related to R7I333 or multidimensional clustering issues.
  Documentation: Review SAP BW documentation for best practices on managing DataStore Objects and handling MDC.
  
  If the issue persists after trying the above solutions, it may be beneficial to consult with SAP support or your technical team for further investigation.