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Focal Point    Focal Point Forums  Hop To Forum Categories  WebFOCUS/FOCUS Forum on Focal Point     [SOLVED] What is the roll of CARDINALITY value in an ACX (access) file.

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[SOLVED] What is the roll of CARDINALITY value in an ACX (access) file.
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John W Price
Silver Member
posted
I have an ACX File for an MS-SQL table:
SEGNAME=BOOKS, CARDINALITY=564,
TABLENAME=dbo.Books,
CONNECTION=AudioBooks,
KEYS=1, $
FIELD=BOOKID,
AUTOINCREMENT=YES,
START=1000, INCREMENT=1, $
The only definition I have found indicates it is to indicate 1:1, 1:M and M:M relationships. What is a 564 ?

This message has been edited. Last edited by: <Kathryn Henning>,



WebFOCUS 8.0.2, FOCUS since 1977 - John@Aviter.com
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Posts: 40 | Registered: April 19, 2013Report This Post
j.gross
Virtuoso
posted Hide Post
Number of rows in the table.

I suppose the syntax is there to carry hints that may help the SQL-generator optimize the generated SQL (although I would think the RDBMS is much better at that game).
 
Posts: 1925 | Location: NYC | In FOCUS since 1983 | Registered: January 11, 2005Report This Post
David Briars
Master
posted Hide Post
564 is the number of rows in the table, at the time of the .acx creation.

If WebFOCUS needs to make a decsion, based on the size of the tables, used in a JOIN, this number (CARDINALITY=) will be referenced.

(As a CUBS fan, I've always had an issue with CARDINALITY.)




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Posts: 822 | Registered: April 23, 2003Report This Post
John W Price
Silver Member
posted Hide Post
Jack and David,

Thank you.

David, I'm not a baseball fan, but I still got a great laugh from your CUBS vs CARDINALS reference.



WebFOCUS 8.0.2, FOCUS since 1977 - John@Aviter.com
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Posts: 40 | Registered: April 19, 2013Report This Post
<Emily Duensing>
posted
Hi John,

If memory serves me correctly, I believe it is the number of rows in the table. Depending on the adapter, the optimizer can use that value to make decisions on how to join tables. I seem to remember it should only be used for pretty static tables as you wouldn't want that value in your ACX if the actual value varies -- that could cause some inaccurate decisions by the optimizer.
 
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Francis Mariani
Expert
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I've never seen this CARDINALITY attribute, neither have I seen the AUTOINCREMENT, START and INCREMENT attributes - what type of dbms is this acx for?

Cheers,


Francis


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Posts: 10577 | Location: Toronto, Ontario, Canada | Registered: April 27, 2005Report This Post
David Briars
Master
posted Hide Post
Francis - For us, CARDINALITY is an optional attribute, within our WF adapter for Oracle.

This message has been edited. Last edited by: David Briars,




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Posts: 822 | Registered: April 23, 2003Report This Post
Wep5622
Virtuoso
posted Hide Post
quote:
Originally posted by Emily Duensing:
If memory serves me correctly, I believe it is the number of rows in the table. Depending on the adapter, the optimizer can use that value to make decisions on how to join tables.


I imagine it also gets used in cross-database joins to determine which table to fetch entirely and which to select only specific values from (based on the result set from the smaller table).
For example, if you have a table A and a table B with cardinalities of a billion rows and just 10 respectively, then it's much more efficient to select the 10 rows from table B and apply an IN() clause to table A with those values than it would be to fetch the entirety of table A.

I don't know if WebFOCUS is smart enough to do that. I hope it is.


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Posts: 1669 | Location: Enschede, Netherlands | Registered: August 12, 2010Report This Post
John W Price
Silver Member
posted Hide Post
Francis,
This is a MS-SQL datsabase table. Autoincrement is the result of the MS-SQL IDENTITY function - which automatically increments the key field when adding new records.



WebFOCUS 8.0.2, FOCUS since 1977 - John@Aviter.com
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Posts: 40 | Registered: April 19, 2013Report This Post
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