Histograms on more than 32 character values

I am having histogram on one of my varchar2(80) column. 30% of the records in the column have first 40 chars same because of which it is creating histograms for 80 buckets with similar endpoints and generating large cardinality though the actual resultset cardinality is only 2/3 records. Because of large cardinality query is going for FTS when searching for these strings and index scan when searching for values with 10 char string.
In actual cardinality of the column is very low but optimizer is calculating it high because of incorrect histograms.Any idea on how to deal with histograms with more than 32 chars columns with first 32 chars similar or I should not create histograms on this column?

Do not use histograms unless you need them. Is the data distribution for that column that far from uniform? You can run this simple query to see if you need histograms:
select col , count(*)
from tab
group by col
order by 2 descIf the difference in counts is not that great (you understand that this is an informal method), then you probably do not need histograms.
Or you can try to calculate statistics, such as skew, to see if you need histograms.
In case you need histograms:
->I do not think there is anything you can do for the 30% of the records that share the same first 40 characters. You can solve the issue by changing your table structure and queries, but that’s another topic.
->You might be able to create your own custom (fake) histogram about the other 70% of your data. Jonathan Lewis has a number of great posts about that - http://jonathanlewis.wordpress.com/2010/03/23/fake-histograms/
Iordan Iotzov
http://iiotzov.wordpress.com/

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Try using the Text Editor for more info go throught the Control Examples
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Dear All,
i am trying to write the column of a table to a file with the '||' seperators. i want to write all the rows in one line of the file.
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user577300 wrote:
Dear All,
i am trying to write the column of a table to a file with the '||' seperators. i want to write all the rows in one line of the file.
for E.g
Column1 Column2
A B
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in the file the output needs to be gone like
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but after 32767 character it gives a write error. could please someone let me know what is wrong with my function below or how can i write more than 32767 character in one one.
CREATE OR REPLACE FUNCTION CORP_IB_DUMP_FILE (
P_QUERY IN VARCHAR2,
P_SEPARATOR IN VARCHAR2 DEFAULT '',
P_DIR IN VARCHAR2,
P_FILENAME IN VARCHAR2
RETURN NUMBER AUTHID CURRENT_USER
IS
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L_THECURSOR INTEGER DEFAULT DBMS_SQL.OPEN_CURSOR;
L_THECURSOR2 INTEGER DEFAULT DBMS_SQL.OPEN_CURSOR;
L_COLUMNVALUE VARCHAR2 (4000);
L_STATUS INTEGER;
L_COLCNT NUMBER DEFAULT 0;
L_SEPARATOR VARCHAR2 (10) DEFAULT '';
L_CNT NUMBER DEFAULT 0;
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EXCEPTION
WHEN OTHERS
THEN
IF (SQLCODE = -1007)
THEN
EXIT;
ELSE
RAISE;
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L_STATUS := DBMS_SQL.EXECUTE (L_THECURSOR);
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UTL_FILE.FCLOSE (L_OUTPUT);
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What value are you pasising in as p_seperator?
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Edited by: sridhar arjunan on Jul 28, 2009 4:22 PM
Edited by: sridhar arjunan on Jul 28, 2009 4:23 PM

Histograms on more than 32 character values

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