Regarding olap cache

Hi,
Can anyone kindly tell olap cache realtime issues.
Thanks in advance.
Edited by: Muddus on Mar 10, 2010 7:48 AM
Edited by: Muddus on Mar 10, 2010 7:48 AM

Hi,
To optimize the report performance we will use it. see
http://help.sap.com/saphelp_nw2004s/helpdata/EN/41/b987eb1443534ba78a793f4beed9d5/content.htm
Thanks
Reddy

Similar Messages

Query views are not using OLAP cache

Hi,
I am trying to pre-fill the OLAP cache with data from a query so as to improve the performance of query views.
I have read several documents on the topic, such as How to Performance Tuning with the OLAP Cache (http://www.sapadvisors.com/resources/Howto...PerformanceTuningwiththeOLAPCache$28pdf$29.pdf)
As far as I can see, I have followed the instructions and guidelines in detail on how to set up the cache and pre-fill it with data. However, when I run the query views they never use the cache. For example, point 3.4 in the abovementioned document does not correspond with my results.
I would like some input on what I am doing wrong:
1. In RSRT I have Cache mode = 1 for the specific query.
2. The query has no variables, but the following restrictions (in filter): 0CALMONTH = 09.2007, 10.2007, 11.2008 and 12.2007.
3. I have one query view with the restriction 0CALMONTH = 10.2007, 11.2008 and 12.2007.
4. I have a second query view, which builds on the same query as the first query view. This second query view has the restriction 0CALMONTH = 11.2008 and 12.2007.
5. There are no variables in the query.
6. I run the query.
7. I run the first query view, and the second query view immediately after.
8. I check ST03 and RSRT and see that cache has not been used for either of the query views.
Looking at point 3.4 in the abovementioned document, I argue that the three criteria have been fulfilled:
1. Same query ID
2. The first query view is a superset of the second query view
3. 0CALMONTH is a part of the drill-down of the first query view.
Can someone tell me what is wrong with my set-up?
Kind regards,
Thor

You need to use following process of process chain: "Attribute change run (ATTRIBCHAN)". This process needs to be incorporated into your process chains which loads data into provider on top of which your query is based.
See following links on topic how to build it:
https://help.sap.com/saphelp_nw73/helpdata/en/4a/5da82c7df51cece10000000a42189b/frameset.htm
https://help.sap.com/saphelp_nw70ehp1/helpdata/en/9a/33853bbc188f2be10000000a114084/content.htm
cheers
m./

How to empty out Olap Cache for a query?

Hi experts,
I think the olap cache for a query should be resetted to zero after a data load (right?), if i have understood well how it works. Where can i check the olap cache for the query? I'd like to ckeck the change of the Olap Cache for a specific query.
I checkt in the Cache Monitor but I haven't found any data.
Francesco

Hi
You can use the Transaction code RSRCACHE
Regards
N Ganesh

OLAP Cache

how does OLAP Cache work?

Logical File Names
Use
To save data in a file in the cache modes Main Memory Cache with Swapping, Flat File Cache per Application Server, or Cross-Application Server (see Cache Mode), the following specifications must first be set:
●      Definition of the logical file path and assignment to a platform-specific physical path
●      Definition of the logical file name
From the Cache Monitor screen, using Logical File Names, you can access the complex table maintenance for logical file paths and names. The table maintenance consists of several subdialogs (views). SAP has delivered a proportion of the required settings.
You need to check these settings and make any necessary adjustments for your file system before you can use the persistent OLAP cache with a flat file as a background store.
Note that these assignments are subject to settings made for the transport connection (You need a request that can be transported).
Features
The following section gives an overview of the subdialog in the table maintenance using an example configuration. For more information about the procedure, see Defining Logical Path and File Names.
You can choose the following subdialogs using the dialog structure:
Logical File Path Definition
The (platform-independent) logical file path is evaluated at runtime to generate the (platform-dependent) physical path (see Assignment of Physical Paths to Logical Path).
Two examples of this are:
●        Logical file path: BW_OLAP_CACHE
Name: BI OLAP Cache
●        Logical file path: BW_OLAP_CACHE_SPAN
Name: BI OLAP Cache Cross-Application Server
Assignment of Physical Paths to Logical Path
At runtime, the physical path assigned to the corresponding operating system is generated from the logical file path.
Since the physical path is platform-dependent, the customer has to specify it. The closer the file is to the application server or, with the cross-application server cache mode, to the application server, the faster it can be found and read.
Log(ical) path: BW_OLAP_CACHE
Name: BI OLAP Cache
Syntax group: UNIX (all Unix platforms)
Phys(ical) path: /usr//global/ (You can choose the path up to <FILENAME> according to your own configuration.)
If you cannot find the relevant syntax group for file names and paths for your operating system, you can define your own (see Syntax Group Definition and Assignment of Operating System to Syntax Group).
The <FILENAME> parameter must always be set for the physical file name (see Logical File Name Definition, Cross-Client). At runtime, the complete platform-specific file name is automatically formed from the physical path and the physical file name.
Logical File Name Definition, Cross-Client
At runtime, a complete platform-specific file name including the path is generated for a (platform-independent) logical file name.
In the following example, cache data is stored on an application server:
Logical file: BW_OLAP_CACHE (we recommend you use the delivered attributes for the logical file).
Name: BI OLAP Cache Files
Phys(ical) file: CACHE___
Data format: BIN (binary)
Application area: BW (Business Information Warehouse)
Logical path: BW_OLAP_CACHE (see Logical File Path Definition). Input help is available.
In the following example, cache data is stored cross-application server:
Log(ical) file: BW_OLAP_CACHE_SPAN
Name: BI OLAP Cache Cross-Application Server
Phys(ical) file: CACHE__
Data format: BIN
Application area: BW
Log(ical) path: BW_OLAP_CACHE_SPAN
Note that a particular schema is prescribed for the physical file name:
●      For application server storage (see Global Cache Parameters and Cache Mode Main Memory Cache with Swapping and Cluster / Flat File Cache per Application Server):
CACHE___
●      For cross application server storage (see Global Cache Parameters and Cache Mode Cluster / Flat file Cache Cross-application Server):
CACHE__
The following table offers an overview of the variables that are only replaced with actual values during runtime:
Variables in Physical File Names
Variable
Meaning
<HOST>
Computer/server name (for SY-HOST).
If the data is stored cross-application server, this variable is not required.
<SYSID>
System ID
For example, if two different BI systems are running on one application server, this variable serves to differentiate the systems so that they do not overwrite each other.
<PARAM_1>
External parameter 1 (sequential number in HEX)
Definition of Variables
If you want to use variables in physical file names and paths, you can define these by choosing New Entries.
Syntax Group Definition
You can define a new syntax group for operating systems with the same syntax for file names and paths by choosing New Entries.
Syntax grp: UNIX
Name: All Unix platforms
Length (of file name)
Extension: Choose this option if the data format for the logical data name is allowed as the file name extension for this syntax group.
Active: Choose this option if the operative system for this syntax group is used in the available system configuration.
Assignment of Operating System to Syntax Group
You can assign your operating system to a syntax group by choosing New Entries if necessary.
OP system: SunOS
Name: SUN Unix
Regards,
SUBHA

OLAP-Cache filling and report retrieval from cache

Dear All,
I am expecting good information from you guys in regards to process of OLAP-Cache filling and retrieval process.
Let's say, we have few selectios as below to fill cache.
selection 1:
Calmonth : 201006
Plant : A1 to A3.
OLAP cache is filled with the above selection1.
Selection 2:
Calmonth : 201006
Plant : A4 to A5
OLAP cache is filled with the above selection2.
When I am exeuting a query with the selections as below, how the data will be retrived? Is it from Cache memory or DB?
Selection: Calmonth 201006 and Plant A3 to A4.
Would be really Appreciate If I get some valuable information.
Regards,
KS

Thanks for valuable information.
I have used the mode as "Persistent Cache per Application Server" and " Transparent Table (BLOB)"
What I am realizing here is, If the query selection is different from the cache selection, it is reading it from DB though the requested data is availabe in cache as per the below eg.
Cache Memory:
Selection1: Calmonth : 201006 and Plant : A1 to A2
Selection2: Calmonth : 201006 and Plant : A3 to A4.
Query Selection:
Calmonth : 201006 and Plant : A2 to A3.
Regards,
Kanagaraj.S

Filling OLAP Cache for 3 Bex queries

Dear Experts,
Here, We would required to fill the OLAP cache for four bex queries using the Broadcaster Settings.
can any one please suggest for the following.
how to schedule the OLAP chache filling for 3 different queries at a time. do we need to perform this activity individually for three times for three different queries or can we club three queries and do schedule using only one varaint.
Request you to suggests the steps for performing this activity
Thanks in advance,
Mannu

Hey,
this may be useful for you.
http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/f048c590-31a4-2c10-8599-bd01fabb93d4?quicklink=index&overridelayout=true
Regards,
Kiran

Need clarification on OLAP Cache!!!

Hi,
This is what is to be followed to turn on or off the olap cache!!!!
SPRO -> SAP Reference-IMG
Open the tree: SAP NetWeaver -> Business Intelligence -> Performance Settings
Execute: Global Cache Settings
Check the flag: Cache Inactive
Now the question is....... if you check the "cache inactive" check box, what does it signify? does that mean cache is active or inactive? quite confusing.......
Regards,
Surya Tamada.

Hi,
Pls look on it,
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/9f4a452b-0301-0010-8ca6-ef25a095834a
Also check this,
Re: OLAP Cache issue.....
http://help.sap.com/saphelp_nw70/helpdata/en/b2/e50138fede083de10000009b38f8cf/frameset.htm
http://help.sap.com/saphelp_nw04/helpdata/en/00/241da12ef84f40bb6ecd3ae73d8b58/content.htm
Hope it helps.
Thanks & Regards,
SD

Global Olap Cache

Hello BW Gurus,
We would like to use global olap cache function to optimize the performance of our queries.
We've tried it with using the persistent cache on flat file modus. Unfortunately the size of global cache remains 0 KB, whenever we execute the different queries and system does not generate any flat file.
First of all I would like to ask, what is the relationship between the shared memory size (rdsb/esm/buffersize_kb) and OLAP Cache size. Which one should/must bigger? or this question is irrelevant for to realization of olap-cache.
And could you please tell me, which other parameters should we check?
Debugging with the transaction RSRT (Execute and Debug with Cache Breakpoints) didn't help us.
Thanks for your reply.
Regards,
Nuran Adal

Hi
Have a look at this:
http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/c0ebfba1-5a1a-2d10-82b5-fdddc1e5955c?quicklink=index&overridelayout=true
Thanks
Kalyan

How to understand if olap cache is used

Hi,
I am trying to understand if my query uses the olap cache or not.
First I executed the report with specific selections. After that, I executed the report again with the same selections but it took almost same time to bring the report output. There are lots of exception aggregates in my query, so i wonder if olap cache will help me or not.
So, how can I understand if the query uses the olap cache or not ? (i am using RSRT screen, with 'do not use cache' blank)
Thanks
Ozan

Hi
Check in tcode RSRT. Input your query tech name and from the properties tab, you can see if the olap cache is set to be used in the cache mode field.
You can check if the entries you are making in the cache are used, if you, also from RSRT, go to cache monitor->main memory and expand the folder "query directory".
now search for your query tech name.
a folder will appear with your query tech name if the cache mode enabled.
right-click and choose details. here you will see "read accesses" and the number will tell you how many times this entry has been read.
regards
jacob

OLAP Cache filling using Broadcasting

Hi All,
We have two BEx queries which take more than 30 minutes to complete. One is an inventory cube query and other one is a query with a lot of exception aggregation.
In the Statistics, both queries show that around 90% execution time is at OLAP level.
We created broadcasting settings to fill OLAP cache for both the queries and scheduled in background. In RSRCACHE, we can see entries for both queries.
But the execution time still have not improved. They both are taking same time to complete execution.
Now I doubt if OLAP Cache supports non-cumulative key figures and exception aggregation or not. Is this mentioned in any documentations?
Pls let me know your suggestions.
Thanks in advance,
Regards,
Bijesh

hi,
you can carry out following checks:
1) check parameter of global and local cache, general sense the global cache size should be larger than the local cache size you can configure the cache parameters in RSCUSTV14 or simply ask basis do optimise them acc. to system usage
2) also since you you have checked RSRCACHE, try changing few option in properties change read to X(for large amt of data) by default its H
3) try changing cache mode to with swapping instead of default without swapping, in case of several app server choose mode 4
then click on environment->query mass maintainence
see if these works out
regards
laksh

Pre-fill the OLAP cache for a query on Data change event of infoprovider

Hi Gurus,
I have to pre-fill the OLAP cache for a query,which has bad performance.
I read a doc 'Periodic Jobs and Tasks in SAP BW'
which suggested sum steps to do this
i hav created the setting for Bex broadcasting for scheduling job Execution with data change in info provider
thereafter doc says "an event has to be raised in the process chain which loads the data to this InfoProvider.When the process chain executes the process u201CTrigger Event Data Change (for Broadcaster)u201D, an event is raised to inform the Broadcaster that the query can be filled in the OLAP cache."
how can this b done please provide with sum proper steps
Answers are always appreciated.
Thanks.

Hi
U need to create a process chain or use the existing process chain which you are using to load your current solution, just add event change process type in the process chian and inside it add the info provider which are going to be affected.
Once you are done with this go to the broadcaster and create new setting for that query...you will see the option for event data chainge in infoprovider just choose that and create the settings.
hope it helps

Impact of real time cube on query performance and OLAP cache

Hi:
We have actual and plan cubes both setup as real time cubes (only plan cube is being planned against, not actual cube) and both cubes are compressed once a day.
We are planning on implementing BIA accelerator and have questions related to query performance optimization:
1/ Is there are any query performance benefits in changing the actual cube to be a basic cube (using program SAP_CONVERT_NORMAL_TRANS) if the F table is fully compressed
2/ Can OLAP cache be leveraged for the queries run against the real time cubes e.g. actual cubes
3/ What is the impact on BIA of having the actual cube as real time (whetehr or not there is data being loaded/planned during the day in that cube)
Thank you in advance,
Catherine

1) Is there are any query performance benefits in changing the actual cube to be a basic cube (using program SAP_CONVERT_NORMAL_TRANS) if the F table is fully compressed
From the performance point of view, tha actual cubes i.e std cubes are relatively better.
2) Yes OLAP cache can be leveraged for bringing up the plan query but all the calculations are done in the planning buffer.
3) Not sure.

Olap cache not storing result sets for certain queries

Hi - another cache question
my result set for a query is not getting set in OLAP CACHE - the query variable level is stored ok but not the result set.
different queries store the result sets ok.
there is nothing in the query or cube properties that should disable the caching of the result set.
there is plenty of space available and there has not been any changes to the query or data loaded or aggregates changed.
any ideas?
cheers - Neil

I would do a performance check in RSRT2. This will usually give you some additional information related to olap cache.
Hope that helps.

Automatic filling OLAP Cache

Hi @ll,
i am using bw 3.5....
I`ve a question as to OLAP Cache. Is there any possibility/method to fill the Cache automatically every day?
Id like to use the performance enhancement of caching queries....but i would like to avoid it that the first user who execute a query have a long waiting time....
Exists there any options to handle this?
thx in advance for all answers and helpful advices
Cheers,
Marian

HEllo,
Check the foll link
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/9f4a452b-0301-0010-8ca6-ef25a095834a
Regds,
Shashank

Fill OLAP cache via broadcaster

Hi,
I'm trying to use the broadcaster with distribution type 'Fill OLAP cache' and schedule it using " Including Event Data Changes in Process Chains ". The process chain has been adapted with the 'Event data change' process and scheduled. Process chain runs fine. All was set up according to the link below.
http://help.sap.com/saphelp_nw70/helpdata/EN/a5/359840dfa5a160e10000000a1550b0/frameset.htm
However, when I try to schedule the broadcaster setting, I only get the options of "Execution at Predefined Time" or direct scheduling.
Should I not be able to see "Execution with Data Change in the InfoProvider " as an option? Is there some other setting to be made?
Very grateful for any ideas.
Thanx

Check if you have S_RS_BCS role authorization.
You have to use process type DATACHANGE in the process chain for data load.
Check this http://help.sap.com/saphelp_nw04/Helpdata/EN/ec/0d0e405c538f5ce10000000a155106/content.htm

Regarding olap cache

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