OBIEE - use of chronological Key

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.
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).
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,
Satya

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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.

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
todate(dollars, year), but before doing that i need to set an chronological key in the time dimension hierarchy level.
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

Also,You can also set it for all levels except the Grand Total Level to get good performance...so that each time it doesn't goto lowest level even if its not required.
Setting Chronological Keys for Each Level
Designate a chronological key for every level of each dimension hierarchy. This key must meet the requirements of being sequential (the members have a natural order), cardinal (all members are spaced the same distance apart at a given level, such as day or month), and complete (no members missing).
The Oracle BI Server uses the chronological key to create mathematically correct time series predictions, such as Jan + 2 months = Mar. You should set a chronological key for every level (except for the Grand Total level) so that you can perform time series operations on all levels with good performance. This enables you to use an AGO, TODATE, or PERIODROLLING function for any level of any time dimension hierarchy, such as fiscal month ago, calendar year ago, and day ago.
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.
Hope this helps

Time dimension and chronological key

HI ALL
I WORK ON OBIEE 11G REPORTS
WHAT IS THE EXACT USE OF TIME CHECK BOX AND CHRONOLOGICAL KEY??
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.
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.
Award points it is useful.
Thanks
satya
Edited by: Satya Ranki Reddy on May 2, 2012 12:29 AM

Primary Key and Chronological Key for Time Dimension

Could someone please shed light whether it's better to use normal PK or Calendar Date (which is a chronological key on the most detailed level). I tried both and haven't noticed any difference. But my understanding is that I still need to have the PK key on the most detailed level in time hierarchy.
Thanks

Matt,
the PK of the Time Dimension is a regular sequence numeric key. I have it defined as a logical PK for the dimension. However, I guess I was talking about hierarchy key. I tested it either way and the query time is the same. So I guess it doesn't really matter.
--------Year
Year (chronological key and primary key)
------------------Quarter
Quarter (key)
Quarter+Year (primary key, chronological key)
---------------------------------Day Detail
PK (key)
Date (primary key , chronological key)
I hope it makes sense.

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I have a table that has x3 primary keys: Table is called "time_off_awards". The x3 primary keys are: last_name, first_name, approval_date.
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[http://www.wczone.com/link_settings.gif]
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[http://www.wczone.com/report_link.gif]
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LAST_NAME VARCHAR2(40) NOT NULL,
FIRST_NAME VARCHAR2(25) NOT NULL,
APPROVAL_DATE DATE NOT NULL,
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FOREIGN KEY (LAST_NAME, FIRST_NAME)
REFERENCES PERSONNEL.MARC_PERSONNEL(LAST_NAME, FIRST_NAME)
TABLESPACE PERSONNEL;
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Edited by: user10495310 on Mar 4, 2009 8:21 AM

Thank you everyone for the help and information you gave to me.
Your ideas and advice helped me to think through the issues involved.
The way i actually found to work around this issue was a little different.
What I did was the following (which may only be usable with empty tables. If its possible to create a new column with a sequence and trigger on a table that already contains data it should work also):
1. I removed the current PK's that were currently set.
2. I added a single, unique PK (that used a sequence and trigger to automatically increment) to the table as was suggested in this thread and other APEX forum threads.
3. I changed the link on the report so that it used the new PK, and also changed the PK used on the forms (under Processes - both the page rendering and page processing processes).
The Difference:
4. Next I changed the table (not by using APEX, but directly) from using the automatically generated ID as the PK, back to using the compound PK (x3 keys). I then added an constraint to make sure that the automatically generated column was unique. So now I have the compound PK that my supervisor wants us to use, and I'm able to use a unique, automatically generated key for APEX to use.
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OBIEE - use of chronological Key

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