What is use of chronological key

hi all
when i was trying to perform Time series functions ..why we have to select the chronological key..?
i have created time dimension..and i have created year,month,week,day...levels in year level i have added calendar_yaer and
calendar_year_id,....and i defined two columns as key values.... and calendar_year for drill down...
in that if i use calendar_year as chronological key what would be the result...
if i use caleendar_year_id as chronological key what would be the result....
i tried it and both are giving same result...
i don't under stand why we have to select the chronological key???
please any one tel me about it
Thanks

Typically time dimension differs from all other dimensions in one way and that is,
all other dimensions dont care about the order of the values in it.
e.g. in region_dim the values are north, south, west and east. Here nobody wants to see whether north comes first or south comes first. i.e. no order is required here.
in the case of time dimension there needs to be a particular order for all the values present in it.
e.g. 2010 is earliest and 2004 is older. Dec-10 is earliest and jan-10 is older. i.e. the values in the time dimensiion needs to follow a particular sorting order. So the chronological key is the key which tells the obiee that the data is incrementing based on the chronological column.
Here you may get another doubt. i.e. you are having columns like year, half_year, quarter, month, week and day. Here which one should become the chronolgocial key?
Analyse it yourself. If you kept year as chro key then obiee will be confused whether jan-10 is earliest or feb-10 is earliest. Because it knows only that 2010 is earliest and 2009 is older.
So always it should be the lowest level oif the dimension which needs to be the chronological key. In the abouve case it should be date.
You can select either date or date_id(this could be a sequence generator values).
Hope you understand this.

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Hi all,
can any body explain in detail what is the use of chronological key and why we need to enable the
time dimension at time of creating a time dimension hierarchy.
Thanks
bharath

HI Bharth,
What is the chronological key use?
A. Typically time dimension differs from all other dimensions in one way and that is,
all other dimensions dont care about the order of the values in it.
e.g. in region_dim the values are north, south, west and east. Here nobody wants to see whether north comes first or south comes first. i.e. no order is required here.
in the case of time dimension there needs to be a particular order for all the values present in it.
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Here you may get another doubt. i.e. you are having columns like year, half_year, quarter, month, week and day. Here which one should become the chronolgocial key?
Analyse it yourself. If you kept year as chro key then obiee will be confused whether jan-10 is earliest or feb-10 is earliest. Because it knows only that 2010 is earliest and 2009 is older.
So always it should be the lowest level oif the dimension which needs to be the chronological key. In the abouve case it should be date.
You can select either date or date_id(this could be a sequence generator values).
2. what is the use time dimension?
A.If all you want is to achieve drills from Month, Quarter and Year then treat it as a normal dimension and create the levels. But if you want to do calculations like YTD, QTD and MTD then you need to create a time dimension.
http://oraclebizint.wordpress.com/2007/11/05/oracle-bi-ee-101332-understanding-todate-and-ago-achieving-ytd-qtd-and-mtd/
Refer the above link for time dimension.
Hope this help's
Thanks,
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Chronological Key

Hi friends,
Im trying to do YTD and PTD calculation using the following below links
http://download.oracle.com/docs/cd/E21764_01/bi.1111/e10540/dimensions.htm#i1023744
By using 'todate' function i can able to do it. But im having a doubt in setting a chronological key. Assume that suppose if im calculating year to date for my Measure column 'Dollars'
ill be taking the following syntax in the expression builder like
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Since im having the following time dimension levels
year
half
quarter
month
week
day
Whether i need to set a chronological key for all the levels, or i need to set only for the lowest level 'day'. For which level i need to set chronological key inorder to get correct results.
Thanks
Brgds,
GTA

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Theoretically, time series functions operate correctly if only the bottom level key in the Logical Dimension is chronological. In practice, however, this causes performance problems because it forces the physical query to use the lowest grain, causing joins of orders of magnitude more rows (for example, 365 times more rows for a "year ago" joining at the "day" grain). It also means higher-level aggregate tables are never selected by the query planner when using the time series functions, which again significantly slows the query.
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HI ALL
I WORK ON OBIEE 11G REPORTS
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AND HOW CAN I USE IT
ANY HELP ??

Hi,
What is the chronological key use?
A. Typically time dimension differs from all other dimensions in one way and that is,
all other dimensions dont care about the order of the values in it.
e.g. in region_dim the values are north, south, west and east. Here nobody wants to see whether north comes first or south comes first. i.e. no order is required here.
in the case of time dimension there needs to be a particular order for all the values present in it.
e.g. 2010 is earliest and 2004 is older. Dec-10 is earliest and jan-10 is older. i.e. the values in the time dimensiion needs to follow a particular sorting order. So the chronological key is the key which tells the obiee that the data is incrementing based on the chronological column.
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Analyse it yourself. If you kept year as chro key then obiee will be confused whether jan-10 is earliest or feb-10 is earliest. Because it knows only that 2010 is earliest and 2009 is older.
So always it should be the lowest level oif the dimension which needs to be the chronological key. In the abouve case it should be date.
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2. what is the use time dimension?
A.If all you want is to achieve drills from Month, Quarter and Year then treat it as a normal dimension and create the levels. But if you want to do calculations like YTD, QTD and MTD then you need to create a time dimension.
http://oraclebizint.wordpress.com/2007/11/05/oracle-bi-ee-101332-understanding-todate-and-ago-achieving-ytd-qtd-and-mtd/
Refer the above link for time dimension.
Award points it is useful.
Thanks
satya
Edited by: Satya Ranki Reddy on May 2, 2012 12:29 AM

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