BW : Question what is rollup and compress

Hiii Guys ,
I wanted to ask that what do you mean by Rolllup the cube and compress the cube..Why do u need it?what is its significance and how it is done?
Plz let me know.
Thanks & Regards
MAdhavi S Bichakal

Hi Madhavi,
Roll Up :
It is done if our cube has Aggregates. When you update your Cube with fresh data it must reflect in aggregates of that with that fresh data so for this we do Roll Up.
If you do not perform rollup regularly, your report will show old data.
Lets say that you have aggregates on your cube and all requests have been rolled up as of now. Lets say the latest request is 34256...All data is available for reporting now upto request 34256.
Say you loaded your InfoCube again 4 times. These 4 requests are NOT available for reporting if they are not rolled up, even if the query uses aggregate OR NOT. So, if you run a query you will only get data upto request 34256, which was the last rolled up request.
So, if you have aggregates, its a best practice to rollup into the aggregates at the earliest for your reports to show latest data, usually as a last step in the same process chain that you use to load your InfoCube.
Compression:
InfoCube has 2 fact tables: E and F. F table has request number associated with each data load. When you compress the cube; data from F table is moved to E table. But request id is deleted from the data loads. Hence the data is stored in a compressed form.
Advantage of cmpression is better query performance.
Disadvantage: Once you move the data from F to E table; you cannot delete the data depending on the request number, you will have to use Selective deletion
Hope it helps.
Regards
Hemant Khemani

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Relation between Rollup and compression.

Hi All,
Is there a relation between rollup and compression ? i.e if i compress the cube, will the rollup job be faster ?

Hi,
Thanks for all your replies. Now the picture is crystal clear.
1. A compression job moves data from F table to E table. This is also applicable for aggregates. If you schedule a compression job for a cube, the aggregates are automatically compressed( You can also compress aggregates of a cube without compressing the cube. There are programs avalibale for the same).
2. Assume that you have not done compression . If you load the data to base cube ,it takes more time to create the indexes after loading.
3) Assume that you have done compression . If you load the data to base cube ,it takes less time than 2 point to create the indexes after loading.
On similar lines, if aggregates of a cube are compressed before rollup, then rollup will be faster. This is what exactly I have experienced. I had a cube which had 1000 request. It was never compressed. The rollup job for the cube used to take around 60,000 seconds. I compressed 900 requests. Now the rollup job gets over in 2400 seconds.So the conclusion is the following:
When aggregates of a cube are compressed, the rollup job runs faster.
Message was edited by: Tej Trivedi

How to delete the rollup and compress request from the cube

Hi Experts,
I have a requirement, one request was updated into the cube and it was been rollup and then compressed. As the request was compressed so based on request id we cant perform the deletion.
So it is possible with selective deletion. Now before performing the selective deletion do i need to deactivate the aggregates.
Help me out on this.
Regards
Prasad

Hi.........
U hav to deactivate the aggregates................bcoz.........Selective deletion is only possible with uncompressed requests...............ie from F fact table...........after compression data moves from F fact table to E fact table.............. you can't do selective deletion on E fact table.........So first deactivate the aggregates............then do the selective deletion..............then again activate the aggregates..............and do the aggregate filling job manually in RSA1..............but I will suggest u delete the request...............bcoz any how u hav to deactivate the aggregates............and in case of selective deletion u hav to be very particular................if ur load is not taking much time............then delete the request and repeat the load............
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Debjani...........

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Rollup and Compression in PC

Guys, Let's say If I have an infocube which has aggregates created on it. In a process chain how would the data flow look like?
Is this one correct??
START > DROP INDEXES > LOAD > CREATE INDEX > Roll Up of Filled Aggregates/BIA Indexes
Also what about the compression?
START > DROP INDEXES > LOAD > CREATE INDEX > Compression of the InfoCube
Thanks,
RG

Hi,
Yes, this is the process.
but regarding compression, it comes after roll up of aggregates(if aggregates exist)
hope this helps

Rollup and compression for inventry

how to do inventry cube compression

hi,
clearly explained in:
( search for the keyword "compression" )
in ...
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/f83be790-0201-0010-4fb0-98bd7c01e328
Assign points if useful ***
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Rollup and compression

hi friends
in process chain after rollup if it possible to include execute infopackage process type.
regards
siva

Hi Siva,
I think the following link's should help you with the procedure.
process chains
process chains
Process chains
http://help.sap.com/saphelp_bw30b/helpdata/en/ad/6b023b6069d22ee10000000a11402f/frameset.htm
Re: Ho to make a variable mandatory or optional?
Check these docs
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/8da0cd90-0201-0010-2d9a-abab69f10045
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/19683495-0501-0010-4381-b31db6ece1e9
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/36693695-0501-0010-698a-a015c6aac9e1
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/9936e790-0201-0010-f185-89d0377639db
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/3507aa90-0201-0010-6891-d7df8c4722f7
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/263de690-0201-0010-bc9f-b65b3e7ba11c
http://help.sap.com/saphelp_nw2004s/helpdata/en/8f/c08b3baaa59649e10000000a11402f/frameset.htm
****Assign Points If Helpful****
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What are ROWID and ROWNUM? Are they stored in database and where?

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What are ROWID and ROWNUM? Are they stored in database and where?
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Sort and compress transport!

Hi SDN,
What is sort and compress of a transport!!

Hi Radhakishan,
Welcome to SDN!!
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Rollup and Datamart concepts for compressed cube

Hi all,
I loaded the data into cube and i compressed it ( collapse ),
Then I have 2 questions
1. Can i use the Rollup option now?
2. Can I load the data into another cube by using the compressed cube?
good answers are rewarded
Regards
Ram

hi sri
Its not like we cannot do rollup before compression. You are right we do rollup to fill the aggregates. When you will do compression the request id will be deleted and the data will move from F table to E table. There will be no requst id at all.
We do rollup based on Request only. If there is no request how can u do rollup. the same requst will not be availabe for reporting if u dont do the Rollup to aggregates.
Regards
Khaja

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BW : Question what is rollup and compress

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