Load time depends on index files

Hi All,
(on BSO)
I read some where like if more index files exists the load time will be increase to search the rite combination to load data value. Is that correct ?
I have restrcutred(level 0) the dense members and done the calculations So my index files become 3 after i have run general load on that database it took 1hr.
I have done sparse restructure( all data) and noticed Index files become 2 and ran general load on that database it took 30 mins time.
Let me know whether m correct or not.
Sorry,m not good in explaning the things. :)
Regards,
Prabhas
Edited by: Prabhas on Jun 13, 2012 9:21 PM

You say you first load into a test cube, then export and use that to load into prod. Is the dimension order and dense/sparse configuration the same? Test cube is a copy of prod cube.so everything must be same.
If your periods (or time) is dense, then loading a single month will still cause fragmentation as it has to read the blocks and rewrite them. I'm guessing things speed up after a restructure because you are getting rid of fragmentation. What you think is a sparse restructure is actually a dense restructure.Please note that We have "years" dimension as a sparse not dense dimension and i have done fragmentation during the maintainance..and loaded but takes much time than usual.But very next day i have added new sparse member and done alldata restructure and cleared the particular month data and loaded which completes faster than y'day load.

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Thanks Aditya for your reply.We are on BW 7.3.
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000000010HIER_NODE
~ROOT
0000000000000002000000009999123110000101
Ep11    p1 p1
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1,0HIER_NODE,ROOT,,0,99991231,10000101,2,0,E,ROOT,ROOT,ROOT
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HI
Find the below link
http://help.sap.com/saphelp_nw2004s/helpdata/EN/0e/fd4e3c97f6bb3ee10000000a114084/frameset.htm
Time-Dependent Hierarchies
Use
In a hierarchy that is not time dependent, the characteristic values are always the same.
If you want to create views of a hierarchy that are valid for a specific time period, you need to create the entire hierarchy as time dependent.
If you want to model relationships that change time-dependently, you need to create the hierarchy structure time-dependently.
Functions
In InfoObject maintenance, you can set whether and in which ways a hierarchy is time dependent. You can choose from the following:
·         whether the hierarchy is not time dependent (Hierarchy Not Time-Dependent). This is set by default.
·         whether the entire hierarchy is time dependent (Entire Hierarchy Time-Dependent).
·         whether individual node relationships are time dependent (Hierarchy Structure Time-Dependent)
·         whether a temporal hierarchy join is used with time-dependent hierarchy structures (Use Temporal Hierarchy Join)
Entire Hierarchy is Time-Dependent
You can either load time-dependent hierarchies (see Loading Time-Dependent Hierarchies) or create them in the BI system (see Creating a Hierarchy). When you create a time-dependent hierarchy, you have to enter a validity interval (valid to and valid from fields).
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In reporting, the system returns the valid hierarchy when a query is executed using the query key date.
Within a restructuring company areas, you can create time-dependent versions of a hierarchy for the Main Area InfoObject. This enables you to compare the restructuring over different time periods in a query.
Time-dependent hierarchy 01/01/1999 - 05/31/1999
Time-Dependent Hierarchy 06/01/1999 - 12/31/1999
Main Area NORTH
Main Area NORTH
Area 1
Area 2
Area 2
Main Area SOUTH
Main Area SOUTH
Area 1
Area 3
Area 3
Area 4
Area 4
In reporting, you can work in the individual columns of the report structure with fixed date values. You may want to do this to compare Main Area North in the Time-Dependent Hierarchy 05/31/2000 with Main Area North in the Time-Dependent Hierarchy 06/01/2000 (simulation).
Time-Dependent Hierarchy Structures
You can either load time-dependent hierarchies (see Loading Time-Dependent Hierarchies) or create them in the BI system (see Creating a Hierarchy).
In hierarchy maintenance, you can determine a valid time interval for each hierarchy node (Valid to and Valid from fields).
In reporting, a hierarchy with time-dependent hierarchy structures is created either for the current key date or for the key date defined for the query. In addition, you can evaluate a hierarchy historically using the temporal hierarchy join.
You can assign an employee to different cost centers at different times within the context of a restructuring.
In the context menu of a hierarchy, choose Display Hierarchy to access the hierarchy display: Each node and leaf has been given a date symbol. Hierarchy nodes that are assigned to different places in the hierarchy structure, depending on the time, are displayed more than once. By double clicking on a hierarchy node, you can display the associated validity period for the node relation.
In the following example, you can double click on the Jones leaf to see that the worker Jones was assigned to region USA between 01/01/1999 and 05/31/1999 and Puerto Rico from 06/01/1999 to 12/31/1999.
In order to use a hierarchy with a time-dependent hierarchy structure in reporting, you require the following settings in the BEx Query Designer:
                            a.      If you want to evaluate a hierarchy with a time-dependent hierarchy structure for a fixed key date, enter the key date in query definition.
                            b.      If you want to evaluate a hierarchy with a time-dependent hierarchy structure historically, for a key date that is to be derived from the data, choose the temporal hierarchy join option and specify the derivation type for the key date.
For a more detailed description of the functions and differences between the two evaluation views, see Time-Dependent Hierarchy Structures in the Query.
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¡        First day of the period
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¡        Delay by number of days (you specify this in the Delay by Days field). In this case, the key date is calculated from the first day in the period plus the number of days specified minus 1. If the key date does not fall within the period, the last day of the period is used.
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·         For February 2005 the key date is calculated as 2/1/2005.
Key date derivation with (basic characteristic = 0FISCPER, derivation type = u201Cdelay by number of daysu201C and u201Ddelay u201C = 29):
·         For K4/01.2005 the key date is calculated as 1/29/2005.
·         For K4/02.2005 the key date is calculated as 2/28/2005.
·         For K4/03.2005 the key date is calculated as 3/29/2005.
Note that the way in which you determine the key date derivation type affects performance. The number of data records that the OLAP processor reads corresponds to the level of detail on which the time characteristic and the leaf level lie. For this reason, choose the time characteristic as approximately as possible in order to keep the hierarchy small.
A small hierarchy has 100 leaves. For a period of 12 months, the OLAP Processor reads 1200 data records at month level. At day level, it reads 36500 data records.
Regards,
kumar reddy.k
Edited by: kumar reddy on Nov 18, 2008 10:50 AM

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Load time depends on index files

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