Reg Aggregates

Hi,
What are aggregates?
What is the process behind activation and filling of aggregates?
Thanks,
Regards,
Jon.

Dear Fresher,
Check this Link for more details...
/community [original link is broken] .
aggregates improve the query performance by fetching the data faster.
The Sequence in which OLAP Processor looks for Query Relevant data is as follows
1. First checks data availability in Local Cache (Which is session dependent, stores in Memory & available in All SAP BW Releases).
2. If Local Cache is NOT available then will check Global OLAP Cache (OLAP Cache buffers Query result set data in order to improve performance of subsequent query executions. It is session/user independent, stores in memory/files/tables & is available from SAP BW 3.X).
3. If Global OLAP Cache is NOT available then will look for relevant Aggregates (Aggregates are subsets of fact table data where summary data is stored as part of new, transparent InfoCubes. Aggregates have the same structure as an InfoCube, with transparent database tables surrounded by the dimensions tables).
4. If No relevant Aggregates are found then it will look into database through InfoProvider.
Just have a look at these documents reg. aggregates
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/3f66ba90-0201-0010-ac8d-b61d8fd9abe9
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/3f66ba90-0201-0010-ac8d-b61d8fd9abe9
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/e55aaca6-0301-0010-928e-af44060bda32
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/cbd2d390-0201-0010-8eab-a8a9269a23c2
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/2299d290-0201-0010-1a8e-880c6d3d0ade
Hope this helps....
Thanks,
Krishna

Similar Messages

Reg Aggregate tables

Hi Experts,
I want small clarification regarding aggregate tables if i want to implement this which method i have i have to follow weather importing aggregate tables from DB to the physical layer or by using aggregate persistence wizard in RD itself.
In which situations we have to go for importing and which situations we have to go for aggregate persistence wizard.
Regards,

You import the aggregated table's if you have them built already in the database and you use the wizard in order to create aggregate tables in the RPD that does not exist in the database. The utility automates the creation and initial population of aggregates, persists them in a back-end database and configures the BI Server metadata layer so that they’re used when appropriate. What’s particularly interesting about this feature is that you can create aggregates for, say, an Oracle database and store them in an SQL Server, DB2 or Teradata database

Cube values not getting populated in the report

Hi,
I have done the selective deletion of Purchase orders and done the repair load, the set of records are there in the cube but unable to see in the report.. the records in the cube satisfies the selection criteria also.
expecting the early response,
Points will be rewarded for the any information and solution also if any body face the same problem pls share the information.
regards,
vishali.

Hi,
i have already activated the cube and that repair full request is available for reporting that icon has come in the cube and if it is reg. aggregates there are not aggregates present so .... what might be the problem pls let me know....
regards,
vishali.

Aggregates for cube

HI,
How can we goahead for creating Aggregates for cube.
IF large amount of data in cube or any other cases.
Reg,
Paiva

Hi,
An aggregate is a materialized, aggregated view of the data in an InfoCube. In an aggregate, the dataset of an InfoCube is saved redundantly and persistently in a consolidated form into the database.
Advantages: It speeds up the query performance because the query when executed first looks at the aggregate for data. If the data is not found it is then that the data from cube is fetched.
Disadvantage:We need to maintain the aggregates each time a data load is done. The aggregate occupies space on the database.
To go or not to go for aggregates primarily depends on the query performance. If the query performance is good and the response time is goodthen the aggregates are not needed.
For more info refer:
http://help.sap.com/saphelp_nw04/helpdata/EN/7d/eb683cc5e8ca68e10000000a114084/frameset.htm
check this links u will get idea abt aggregates
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/3f66ba90-0201-0010-ac8d-b61d8fd9abe9
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/e55aaca6-0301-0010-928e-af44060bda32
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/cbd2d390-0201-0010-8eab-a8a9269a23c2
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/2299d290-0201-0010-1a8e-880c6d3d0ade
and check
Refer this thread for for info:
https://www.sdn.sap.com/sdn/collaboration.sdn?contenttype=url&content=https%3A//forums.sdn.sap.com/topusers.jspa%3FforumID%3D132
Re: Performance ....InfoCube and Aggregates
-Shreya

Need help with User Defined Aggregates - Statistical Mode

I would like to use User Defined Aggregates (UDAG) to calculate the Statistical Mode. The mode is the most frequent value among a set of observations.
http://en.wikipedia.org/wiki/Mode_(statistics)
In my application I aggregate an address level table of 130 million records to a ZIP4 level table of roughly 36 million records. Some ZIP4s will have 1 record, some may have 1000+ records. I need to use statistical modes to pick the most frequent values for some of the attribute fields.
Presently I am using an approach from AskTom using the Analytic functions combined with nesting subqueries. The code works but it's cumbersome. I feel user defined aggregates should be able to perform a simpler more straightforward integration into SQL queries.
I've reviewed several of the other posts in this forum on User Defined Aggregates. I feel I could write a procedure that calculates and average or merely concatenates strings. But this particular application of the UDAGs is stumping me. Rather than just increased a running total or count or concatenating a master string, you'd have to keep every distinct values and a count for how many times that value occured. Then evaluate those items to pick the most frequent to pass to output. I'm finding it difficult as a novice.
Any, I'll post a quick example using the present approach that I want to replace with a UDAG:
Here's a small table:
DRD> desc statmodetest
Name Null? Type
ID NUMBER
STATE VARCHAR2(2)
REGION VARCHAR2(1)
1* select * from statmodetest
DRD> /
ID ST REG
1 TX W
2 MN W
3 CA W
4 VA E
5 VA E
6 KY E
7 MN W
8 FL E
9 OK W
10 NC E
11 TX W
12 WI E
13 CA W
14 MI E
15 FL E
16 FL E
17 TN E
18 FL E
19 WI E
20 MA E
Now here's a query approach that gets the MODE State value for each Region.
1 SELECT DISTINCT region, mode_state, mode_state_cnt FROM (
2 SELECT region,
3 FIRST_VALUE(state) OVER (PARTITION BY region ORDER BY stcnt DESC) AS mode_state,
4 FIRST_VALUE(stcnt) OVER (PARTITION BY region ORDER BY stcnt DESC) AS mode_state_cnt
5 FROM (
6 select id, state, region, COUNT(state) OVER (PARTITION BY region, state) AS stcnt
7* from statmodetest t ) )
DRD> /
R MO MODE_STATE_CNT
W CA 2
E FL 4
What I'd like to be able to do is have a UDAG that supports this style query:
SELECT region, UDAGMODE(state)
FROM statmodetest
GROUP BY region ;
Thanks,
Paul

This is not what you want..?
SQL> select * from test;
        ID STATU REGIO
         1 TX    W
         2 MN    W
         3 CA    W
         4 VA    E
         5 VA    E
         6 KY    E
         7 MN    W
         8 FL    E
         9 OK    W
        10 NC    E
        11 TX    W
        12 WI    E
        13 CA    W
        14 MI    E
        15 FL    E
        16 FL    E
        17 TN    E
        18 FL    E
        19 WI    E
        20 MA    E
20 rows selected.
SQL> select region,max(status) keep(dense_rank first order by cnt desc,status) st,
2         max(cnt)
3 from(
4       select region,status,count(*) cnt
5       from test
6       group by region,status)
7 group by region;
REGIO ST      MAX(CNT)
E     FL             4
W     CA             2
<br>
<br>
Or I misread..?

Index's on cubes or Aggregates on infoobjects

Hello,
Please tell me if it is possible to put index's on cubes; are they automatically added or is this something I put on them?
I do not understand index's are they like aggregates?
Need to find info that explains this.
Thanks for the hlep.
Newbie

Indexes are quite different from aggregates.
An Aggregate is a slice of a cube which helps the data retrival on a faster note when a query is executed on a cube. Basically it is kind of a snapshot of KPI's and Business Indicators (Chars) which will be displayed as the initial query run result.
Index is a process which is inturn will reduce the query response time. While an object gets activated, the system automatically create primary indexes. Optionaly, you can create additional index called secondary indexes.Before loading data, it is advisable to delete the indexes and insert them back after the loading.
Indexes act like pointers for quickly geting the Data.When u delete it will delete indexes and when u create it will create the indexes.
When loading we delete Bcs during loading it has to look for existing Indexes and try to update so it will effect the Data load performence so we delete and create it will take less time when compared to updating the existing ones.
There is one more issue we have to take care if u r having more than 50 million records this is not a good practice insteah we can delete and create during week end when they r no users.

How can I see the data in the aggregates

how can see the data available in the aggregates.
Jay

Hi Jay,
its so simple,
please goto the manage aggregates screen and copy the technical name of the aggregate and add
/bic/exxx xxx is the aggregate technical name, and for f fat table use /bic/fxxx, and go to se16 and enter the table name and thats it ur data is with u.
R

Mail can't send email from 123-reg accounts

Hi all,
I've got an issue with Mac Mail can’t send email from 123-reg accounts.
I know there is a lot of articles on simular matters and some I have tried out with no luck, others are just speaking a whole other language.
Any help would be greatly recived, here's my situation below:
Running a iMac 2.8GHz Intel Core i5 on OS X 10.8.3
I’m using 3 accounts on Macs Mail client, one is my iCloud account that is working fine and the other two are my 123-reg accounts that I use for business purposes. I’ve been working like this for a couple of years now and about 6 months ago I upgrade my operating system from Snow Leopard to Mountain Lion.
2 or 3 months ago I randomly got a problem where I was unable to send any emails from my 123-reg account, I could only receive emails. I checked my settings and they were all correct and unchanged so I attempted to delete them and recreate the account but with no such luck.
I then decided to check if it was a problem at 123-regs end and attempted to log into web mail. This worked and was able to both send and receive emails so eliminated that possibility.
I also have these accounts set up on my iPhone, so checked if there was any issues and everything was working fine. I then checked my iphone details and made sure the same was on my desktop and still no such luck.
I’ve tried out some of the articles I’ve found on here (the ones written in plain English) still no results. I’m not very IT illiterate and just wondered if anyone else has got any ideas, whether there is something specific with 123-reg accounts and Mac Mail?
Many thanks.

Thanks
I just had another hunt around looking at posts and discovered that it was because I recently changed to BT Infinity and they had a block on.
I didn't even think to question the ISP.
https://discussions.apple.com/message/21173608#21173608

Aggregates, VLAN's, Jumbo-Frames and cluster interconnect opinions

Hi All,
I'm reviewing my options for a new cluster configuration and would like the opinions of people with more expertise than myself out there.
What I have in mind as follows:
2 x X4170 servers with 8 x NIC's in each.
On each 4170 I was going to configure 2 aggregates with 3 nics in each aggregate as follows
igb0 device in aggr1
igb1 device in aggr1
igb2 device in aggr1
igb3 stand-alone device for iSCSI network
e1000g0 device in aggr2
e1000g1 device in aggr2
e1000g2 device in aggr3
e1000g3 stand-alone device of iSCSI network
Now, on top of these aggregates, I was planning on creating VLAN interfaces which will allow me to connect to our two "public" network segments and for the cluster heartbeat network.
I was then going to configure the vlan's in an IPMP group for failover. I know there are some questions around that configuration in the sense that IPMP will not detect a nic failure if a NIC goes offline in the aggregate, but I could monitor that in a different manner.
At this point, my questions are:
[1] Are vlan's, on top of aggregates, supported withing Solaris Cluster? I've not seen anything in the documentation to mention that it is, or is not for that matter. I see that vlan's are supported, inluding support for cluster interconnects over vlan's.
Now with the standalone interface I want to enable jumbo frames, but I've noticed that the igb.conf file has a global setting for all nic ports, whereas I can enable it for a single nic port in the e1000g.conf kernel driver. My questions are as follows:
[2] What is the general feeling with mixing mtu sizes on the same lan/vlan? Ive seen some comments that this is not a good idea, and some say that it doesnt cause a problem.
[3] If the underlying nic, igb0-2 (aggr1) for example, has 9k mtu enabled, I can force the mtu size (1500) for "normal" networks on the vlan interfaces pointing to my "public" network and cluster interconnect vlan. Does anyone have experience of this causing any issues?
Thanks in advance for all comments/suggestions.

For 1) the question is really "Do I need to enable Jumbo Frames if I don't want to use them (neither public nore private network)" - the answer is no.
For 2) each cluster needs to have its own seperate set of VLANs.
Greets
Thorsten

Aggregates on Non-cumulative InfoCubes, stock key figures, stock, stocks,

Hi..Guru's
Please let me know if anybody has created aggregates on Non-Cumulative Cubes or key figure (i.e. 0IC_C03 Inventory Management.)
I am facing the problem of performance related at the time of execution of query in 0IC_C03.( runtime dump )
I have tried lot on to create aggregate by using proposal from query and other options. But its not working or using that aggr by query.
Can somebody tell me about any sample aggr. which they are using on 0ic_c03.
Or any tool to get better performance to execute query of the said cube.
One more clarification req that what is Move the Marker pointer for stock calculation. I have compressed only two inital data loading req. should I compress the all req in cube (Regularly)
If so there would be any option to get req compress automatically after successfully load in data target.
We are using all three data sources 2lis_03_bx,bf & um for the same.
Regards,
Navin

Hi,
Definately the compression has lot of effect on the quey execution time for Inventory cubes <b>than</b> other cumulated cubes.
So Do compression reqularly, once you feel that the deletion of request is not needed any more.
And ,If the query do not has calday characterstic and need only month characterstic ,use Snap shot Info cube(which is mentioned and procedure is given in How to paper) and divert the month wise(and higher granularity on time characterstic ,like quarter & year) queries to this cube.
And, the percentage of improvement in qury execution time in case of aggregates is less for non cumulated cubes when compared to other normal(cumulated) cubes. But still there is improvement in using aggregates.
With rgds,
Anil Kumar Sharma .P
Message was edited by: Anil Kumar Sharma

Re: How to Improve the performance on Rollup of Aggregates for PCA Infocube

Hi BW Guru's,
I have unresolved issue and our team is still working on it.
I have already posted several questions on this but not clear on how to reduce the time on Rollup of Aggregates process.
I have requested for OSS note and searching myself but still could not found.
Finally i have executed one of the cube in RSRV with the database selection
"Database indexes of an InfoCube and its aggregates" and got warning messages i was tried to correct the error and executed once again but still i found warning message. and the error message are as follows: (this is only for one info cube we got 6 info cubes i am executing one by one).
ORACLE: Index /BI0/IACCOUNT~0 has possibly degenerated
ORACLE: Index /BI0/IPROFIT_CTR~0 has possibly degenerated
ORACLE: Index /BI0/SREQUID~0 has possibly degenerated
ORACLE: Index /BIC/D1001072~010 has possibly degenerated
ORACLE: Index /BIC/D1001132~010 has possibly degenerated
ORACLE: Index /BIC/D1001212~010 has possibly degenerated
ORACLE: Index /BIC/DGPCOGC062~01 has possibly degenerated
ORACLE: Index /BIC/IGGRA_CODE~0 has possibly degenerated
ORACLE: Index /BIC/QGMAPGP1~0 has possibly degenerated
ORACLE: Index /BIC/QGMAPPC2~0 has possibly degenerated
ORACLE: Index /BIC/SGMAPGP1~0 has possibly degenerated
i don't know how to move further on this can any one tell me how to tackle this problem to increase the performance on Rollup of Aggregates (PCA Info cubes).
every time i use to create index and statistics regularly to improve the performance it will work for couple of days and again the performance of the rollup of aggregates come down gradually.
Thanks and Regards,
Venkat

hi,
check in a sql client the sql created by Bi and the query that you use directy from your physical layer...
The time between these 2 must be 2-3 seconds,otherwise you have problems.(these seconds are for scripts that needed by Bi)
If you use "like" in your sql then forget indexes....
For more informations about indexes check google or your Dba .
Last, i mentioned that materialize view is not perfect,it help a lot..so why not try to split it to smaller ones....
ex...
logiacal dimensions
year-half-day
company-department
fact
quantity
instead of making one...make 3,
year - department - quantity
half - department - quantity
day - department - quantity
and add them as datasource and assign them the appropriate logical level at bussiness layer in administrator...
Do you use partioning functionality???
i hope i helped....
http://greekoraclebi.blogspot.com/
///////////////////////////////////////

Questions regarding aggregates on cubes

Can someone please answer the following questions.
1. How do I check whether someone is re-bilding aggregates on a cube?
2. Does rebuilding an aggregate refer to the rollup process? Can it take a few hours?
3. What does it mean when someone switches off an aggregate, basically what is the difference (conceptually/time consumption)between:
                        A. activating an aggregate?
                        B. switching off/on an aggregate?
                        C. rebuilding an aggregate?
3. When a user complains that a query is running slow, do we build an aggregate based on the chars in rows & free chars in that query OR is there anything else we need to include?
4. Does database statistics in the 'MANAGE' tab of a cube only show statistics or does it do anything to improve the load/query performance on the cube?
Regards,
Srinivas.

1. How do I check whether someone is re-bilding aggregates on a cube?
If your aggregate status is in red and you are filling up the aggregate - it is an initial fill of the aggregate and filling up would mean loading the data from the cube into the aggregate in full.
2. Does rebuilding an aggregate refer to the rollup process? Can it take a few hours?
Rebuilding of an aggregate is to reload the data into the aggregate from the cube once again.
3. What does it mean when someone switches off an aggregate, basically what is the difference (conceptually/time consumption)between:
A. activating an aggregate?
this would mean recreating the data structures for the aggregate - this would mean dropping the data and reloading the data.
B. switching off/on an aggregate?
Switching off an aggregate means that it will not be used by the OLAp processor but would mean that the aggregate still gets rolled up. Rollup referring to loading changed data from the cube into the aggregate - this is done based n the requests that have not yet been rolled up into the cube.
C. rebuilding an aggregate?
Reloading data into the aggregate
3. When a user complains that a query is running slow, do we build an aggregate based on the chars in rows & free chars in that query OR is there anything else we need to include?
Run the query in RSRT and do an SQl view of the query and check the characteristics that are used in the query and then include the same into your aggregate.
4. Does database statistics in the 'MANAGE' tab of a cube only show statistics or does it do anything to improve the load/query performance on the cube?
Stats being updated will improve the execution plans on the database. Making sure that stats are up to date would lead to better execution plans and hence possibly better performance but it cannot eb taken for granted that refreshing stats is going to improve query performance.

Back end activities for Activation & Deactivation of Aggregates

Hi ,
Could any body help me to understand the back-end activites performed at the time of activation and deactivation of aggregates.
Is filling of Agreegate is same as Roll up?
What is the diffrence between de-activation and deletion of Aggregate?
Thanks.
Santanu

Hi Bose,
Activation:
In order to use an aggregate in the first place, it must be defined activated and filled.When you activate it, the required tables are created in the database from theaggregate definition. Technically speaking, an aggregate is actually a separate BasicCube with its own fact table and dimension tables. Dimension tables that agree with the InfoCube are used together. Upon creation, every aggregate is given a six-digit number that starts with the figure1. The table names that make up the logical object that is the aggregate are then derived in a similar manner, as are the table names of an InfoCube. For example, if the aggregate has the technical name 100001, the fact tables are called: /BIC/E100001 and /BIC/F100001. Its dimensions, which are not the same as those in the InfoCube,have the table names /BIC/D100001P, /BIC/D100001T and so on.
Rollup:
New data packets / requests that are loaded into the InfoCube cannot be used at first for reporting if there are aggregates that are already filled. The new packets must first be written to the aggregates by a so-called “roll-up”. In other words, data that has been recently loaded into an InfoCube is not visible for reporting, from the InfoCube or aggregates, until an aggregate roll-up takes place. During this process you can continue to report using the data that existed prior to the recent data load. The new data is only displayed by queries that are executed after a successful roll-up.
Go for the below link for more information.
http://sapbibw2010.blogspot.in/2010/10/aggregates.html
Naresh

Aggregate build suggestions

Hello Experts,
We are trying to do performance tuning on a BW3.5 setup ... Currently, we are focusing on queries and looking at the feasibility of building aggregates for performance improvement. We find that most queries see data at the very granular level as follows:
Rows
Profit centre group -> Profit Centre-> Product hierarchy level 1
Columns
Actual , Planed, difference.
Now the proposal generated for the queries do not give profit centre group but only profit centre in the first dimension. Please note that profit centre group is a navigational attribute of profit centre( There is a message that says profit centre cannot be in aggregate because of presence of profit centre group)
Now my question is , in order for these queries to hit the aggregate, should I introduce both Profit centre group and Profit centre in the aggregate? In doing so, will I risk creating a bigger aggregate?
I am not sure if I am making sense. But please feel free to ask questions I will explain more if needed. My question to be precise is, whether all the characteristics required to view the data in a query needs to be present in the aggregate?
Many thanks in advance for all your inputs..
Regards,
Solomon

Hi Solomon,
If your query has to hit the aggregate, then all the characteristics in the selection, filter, default values, rows, columns, used in RKFs, used in exceptional aggregation should be present in the aggregate.
You can execute the query in RSRT ->Execute+Debug-> with Display aggregate found option.
This will tell you exactly what are the characteristics those should be present so that your default view hits the aggregate.
Needless to say, if you are planning to drilldown the report with any characteristic from the free characteristics, even that should be present in the aggregate.
Now coming to your confusion on Profit centre and Profit Centre Group, Since profit centre group is already navigational attribute of profit centre you need not ( can not ) place that in the aggregate, when profit centre is already present.
However, if the query is executed with this nav attribute, it will certainly hit the aggregate ( Can be checked in RSRT ).
Thanks,
Krishnan

Key Figure Aggregate in Bex Query

Hi Gurus
I am using BI7.0; but 3.5x BEx tools
I am loading 6 fields from a flat file. I am loading data for tickets. I have create an InfoObject that counts the number of tickets. No problem. Also I also have key figures that I am assigning the same value to all Charactersitics: 10,30 per ticket.
The Key figures are (Sum) with a Summation aggregation type.
In my Query, the 10,30 aggregate up based on the number of tickets (characteristic) that are available.
Question: How do I remove/stop my key figures from aggregating up (sums) the values of 10, 30 based on the charactersitic? I want only 10, 30 to be present regardless of the number of tickets (constant value applied to the key figure).
Should I change my aggregation type? If so, to what? I see a number of options, such as Last Number, No aggregation, etc
Thank you

I found a solution to my requirement.

Reg Aggregates

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