Average Row Length for Indexes?

Hey guys, still working on my sizing model and had a question about indexes. Is there a comparable avg_row_length to indexes like there are for tables? I know how to formulate average row length on a table no problem... is it the same for indexes? Is there any other overhead aside from normal table overhead that I need to think about with indexes?
Much obliged.
TimS

Justin,
Thanks, I was doing exactly that up until a couple hours ago and reached my conclusion, what you said. I applied 1,3,6,9,12 months worth of data according to dimensions based on time. After I crunched the numbers and did the work, I found my answer. Thanks for your comments.
Regards,
TimS
P.S. Luckily there aren't any deletes in this flow except for housekeeping which is just partition movement. I can only imagine how difficult it will be to start sizing up another data warehouse that already does that. But in this last rookie year I realized in a data warehouse environment (as opposed to OLTP), it's a lot safer to utilize partition movement than to delete, which inevitably leads to fragmentation.
Edited by: TimS on Jul 8, 2009 7:33 PM

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Average Row length in a table

Hi All,
I am new to oracle and I have to find the average row length for all tables in a schema.
Could anyone please help me.
What is the difference between data length and row length.
Thanks in advance
Anu
Message was edited by:
user448373

look at dba_tables

Is there any max character length for index usage ?

deleting this thread..
Edited by: OraDBA02 on Oct 3, 2012 2:32 PM

This is a fairly well documented issue. (At least, I documented it a few years ago in "CBO Fundamentals").
Oracle only considers the first few bytes of a character string when calculating selectivity, so you can get all sorts of anomalous results.
You could start by reading a couple of notes I wrote some time ago - this might give you a few pointers for your particular case:
http://jonathanlewis.wordpress.com/2010/10/05/frequency-histogram-4/
http://jonathanlewis.wordpress.com/2010/10/13/frequency-histogram-5/
Regards
Jonathan Lewis

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Hi,
please suggest if i can calculate the maximum row size for index.
Thanks

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Hi All,
How we can find Avg row length size of a table, without inserting data into a table. This is required to basically estimate table size (roughly). We might need to this for at least 100+ tables.
regards,
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In an FSG we would like to have a column which returns a stat value from a code combination in order have a calculation in the report.
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>
I am trying to find the length of a particular row in a table..is it possible to?
>
No - not without trying to calculating it yourself. What exactly is it you need the exact length for?
There are at least two types of 'length': the number of bytes used by Oracle to store the data in its internal format and the length used for a display format. And the internal format also includes bytes for structure information (e.g. a length byte); those affect the actual data storage.
For example a column defined as DATE requires a length byte and seven bytes for the date data itself in the internal format. And the length in bytes of character data such as VARCHAR2 depends on the actual characters stored in the column and the characterset. For single-byte character sets each character requires one byte of storage but multi-byte characters can take up to four bytes.
And a column defined as NUMBER can take 1-22 bytes for the internal storage but the display format would be different for the data itself as well as needing a sign and a possible decimal point.
See 'Oracle Built-in Data Types' in the SQL Language doc
http://docs.oracle.com/cd/E11882_01/server.112/e17118/sql_elements001.htm

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hi all
I have a work of estimating the average row size of some tables. Because I don't want to populate these tables with data(It's alot work to do it),so I am not able to get the arerage row size from dba_tables by analyzing these tables.
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Hi,
I am not a coder,I am a DBA.Do you think that it's coder's responsibility to do such kind of works?Still i think it part of the dba role to suppport the developers or to provide guidance, the easiet way would be the using package DBMs_SPACE, perhaps if you take the help of developer, ask him to populate the single record with full length or say max length in each table and generate the 10053 trace with basic select clauses, You can the information from the trace too...
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I have a 9.2 instance and I was wondering if there was a max row length in my tables.

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Average Row Length for Indexes?

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