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Line item dimension and high cardinality dimension
1.
Creating Line Item
Dimension and High Cardinality Dimension Applies to: SAP BI 7.0 Summary The project entails with the Query run time improvement on some of the cubes. We found that some of the cubes in our system were taking a lot of time for query execution. This document will clarify how we decided which all dimensions need to be changed to Line Items and which to High Cardinality and how we implemented it in already live environment. Author: Navesh Amol Company: AtoS Created on: 26 September 2011 Author Bio Navesh Amol is currently working in AtoS. He is working on SAP BI 7.0 from last 4.5 years and is mainly involved in Development, Support and Enhancement work. SAP COMMUNITY NETWORK SDN - sdn.sap.com | BPX - bpx.sap.com | BOC - boc.sap.com | UAC - uac.sap.com © 2011 SAP AG 1
2.
Creating Line Item
Dimension and High Cardinality Dimension Table of Contents 1. How to decide which dimension needs to be made Line Item Dimension (LID)/High Cardinality? ................ 3 Case I .............................................................................................................................................................. 4 Case II ............................................................................................................................................................. 5 Case III ............................................................................................................................................................ 5 2. Creation of LID/High Cardinality Dimension ................................................................................................... 5 Case I .............................................................................................................................................................. 5 Case II and Case III ........................................................................................................................................ 6 3. Advantages of creating LIDs/High Cardinality Dimension .............................................................................. 8 Related Content .................................................................................................................................................. 9 Disclaimer and Liability Notice .......................................................................................................................... 10 SAP COMMUNITY NETWORK SDN - sdn.sap.com | BPX - bpx.sap.com | BOC - boc.sap.com | UAC - uac.sap.com © 2011 SAP AG 2
3.
Creating Line Item
Dimension and High Cardinality Dimension 1. How to decide which dimension needs to be made Line Item Dimension (LID)/High Cardinality? There are different scenarios on the basis of which we can decide which dimension should be LID and which should be high Cardinality. To find the list of cubes and dimensions which could be the candidates for LID we used SAP standard code “SAP_INFOCUBE_DESIGNS”. On executing this code we got the list of all the cubes and their corresponding dimensions with the ratio of memory occupied by dimensions to the memory occupied by Fact Table. SAP COMMUNITY NETWORK SDN - sdn.sap.com | BPX - bpx.sap.com | BOC - boc.sap.com | UAC - uac.sap.com © 2011 SAP AG 3
4.
Creating Line Item
Dimension and High Cardinality Dimension After executing this code we will get output as follows:- In the above screen the first column shows the cube name, the second column shows the dimensions (Tables starting with /BI0/D*), E Fact Table (/BI0/E*) and F Fact table (/BI0/F*) and the last column shows the ratio of table to the Fact Table. We took the download of this output to Excel sheet and filtered the whole result on the condition where Dimension table to Fact Table ratio is more than 20 %( as per the recommendation of SAP). We found following 3 different cases in our project which is discussed in detail as follows. Case I For Cube ZSDCACC02 we had one dimension /BIC/DZSDCACC025 which has 2703233 entries and size corresponds to 100% of the Info Cube. Hence we decided to convert this to Line Item Dimension or High Cardinality dimension. However this dimension had multiple characteristics SAP COMMUNITY NETWORK SDN - sdn.sap.com | BPX - bpx.sap.com | BOC - boc.sap.com | UAC - uac.sap.com © 2011 SAP AG 4
5.
Creating Line Item
Dimension and High Cardinality Dimension And the cube already had 16 dimensions (including the 3 compulsory dimensions) hence we had to mark it as High Cardinality Dimension rather than making it a LID. Case II In the info cube ZSDCBIL09 we had one dimension /BIC/DZSDCBIL09B contains almost 57% of info cube data (around 1906470) which is much more than 20% hence we selected it for LID as this dimension had only 2 characteristics And the total number of dimensions in the cube was less than 16 so we decided to split this dimension in two different LIDs as both of the characteristics contained a significant number of data as shown below :- Table /BI0/SREF_DOC_NO contains 6491188 records. Table /BI0/SREFER_DOC contains 3087838 records. Case III In the info cube ZPPC0026 we had a dimension /BIC/DZPPC00262 which contains around 66% of the info cube data(404725) which is much more than 20% hence we opted for LID in this case as it has only one characteristic as follows :- 2. Creation of LID/High Cardinality Dimension As per the cases given above we have different procedures to make a dimension as LID or High Cardinality Dimension. Also we need to keep few points in mind before doing this activity successfully. We will discuss the above cases separately as follows:- Case I We can make a dimension High Cardinality dimension directly in the live environment that is in the production system with cube already having data in it. The point which should be kept in mind while doing this is that there should not be any data load during this time period. However it’s always a good practice to do the changes in the development system and transport it to the production environment after doing the complete testing in the QA. Steps for doing this activity are as follows:- Step 1:- Change the dimension /BIC/DZSDCACC025 to High Cardinality dimension as follows in the development system. Step 2:- Save and activate the cube and its underlying transformations and transport it to the production. SAP COMMUNITY NETWORK SDN - sdn.sap.com | BPX - bpx.sap.com | BOC - boc.sap.com | UAC - uac.sap.com © 2011 SAP AG 5
6.
Creating Line Item
Dimension and High Cardinality Dimension Case II and Case III We can’t create a line item dimension with data in the cube ZSDCBIL09. Hence the only way to create a line item dimension in these cases is as follows (as we need to split the existing dimension in 2 dimensions and make both of them as Line Item Dimension in case II ). However we need not to split the dimension in the Case III so we can skip the step of splitting dimensions for Case III. Step 1:- Create a copy cube similar to the existing cube by selecting Copy option from the context menu of the original cube and provide a name for that. Step 2:- Create a new dimension similar to ZSDCBIL09B in the backup cube by choosing the Create Dimension option from the Context menu of Dimensions in the cube. SAP COMMUNITY NETWORK SDN - sdn.sap.com | BPX - bpx.sap.com | BOC - boc.sap.com | UAC - uac.sap.com © 2011 SAP AG 6
7.
Creating Line Item
Dimension and High Cardinality Dimension Step 3:- Move characteristic REFER_DOC to the new dimension. Step 4:- Mark the new dimension as well as the old dimension as the Line Item Dimension by choosing the Properties option of the Context menu of the dimension as follows :- And then check the LID check box as follows:- Step 5:- Create a transformation and DTP from old cube to new cube. Step 6:- Save and activate the cube and its underlying transformations. Step 7:- Transport the new cube and transformations to the production system. Step 8:- Transfer all data from old cube to new cube in production system. Step 9:- Validate the data content between old and new cube. Step 10:- Delete data from the old cube. Step 11:- Repeat steps 2 to 4 in old empty cube to make the LID. Step 12:- Save and activate the cube and its underlying transformations in production system. Step 13:- Create a transformation and DTP from new cube to old cube. Step 14:- Transfer the data back to the old cube. Step 15:- Delete the new cube Step 16:- If there is delta loads then reinitialize the delta. In our case it was full load hence we did not need to follow this step. SAP COMMUNITY NETWORK SDN - sdn.sap.com | BPX - bpx.sap.com | BOC - boc.sap.com | UAC - uac.sap.com © 2011 SAP AG 7
8.
Creating Line Item
Dimension and High Cardinality Dimension 3. Advantages of creating LIDs/High Cardinality Dimension For Line Item Dimension/High Cardinality dimension no DIM ids are created due to which the join of tables decreases and thus query execution timing improves. Similarly as there is no time taken for creation of DIM table for these dimensions data load timings also improves. SAP COMMUNITY NETWORK SDN - sdn.sap.com | BPX - bpx.sap.com | BOC - boc.sap.com | UAC - uac.sap.com © 2011 SAP AG 8
9.
Creating Line Item
Dimension and High Cardinality Dimension Related Content SAP Help for Line Item Dimension and High Cardinality SAP Help for Info cube Performance SAP SDN SAP COMMUNITY NETWORK SDN - sdn.sap.com | BPX - bpx.sap.com | BOC - boc.sap.com | UAC - uac.sap.com © 2011 SAP AG 9
10.
Creating Line Item
Dimension and High Cardinality Dimension Disclaimer and Liability Notice This document may discuss sample coding or other information that does not include SAP official interfaces and therefore is not supported by SAP. Changes made based on this information are not supported and can be overwritten during an upgrade. SAP will not be held liable for any damages caused by using or misusing the information, code or methods suggested in this document, and anyone using these methods does so at his/her own risk. SAP offers no guarantees and assumes no responsibility or liability of any type with respect to the content of this technical article or code sample, including any liability resulting from incompatibility between the content within this document and the materials and services offered by SAP. You agree that you will not hold, or seek to hold, SAP responsible or liable with respect to the content of this document. SAP COMMUNITY NETWORK SDN - sdn.sap.com | BPX - bpx.sap.com | BOC - boc.sap.com | UAC - uac.sap.com © 2011 SAP AG 10
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