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Oracle 8 Tips  

by Burleson Consulting

The Data Warehouse Development Life Cycle

Oracle Features for the Data Warehouse

Oracle Bitmapped Indexes

Other system that are using Oracle rule-based optimizer must examine each index to determine the cardinality. Listing 8.12 will check all of your b-tree indexes and provide you with a list of candidates in ascending order of cardinality.

Listing 8.12 bitmap.sql identifies low cardinality indexes for bitmapped indexes.

rem Written by Don Burleson

prompt Be patient. This can take awhile . . .

set pause off;
set echo off;
set termout off;
set linesize 300;
set pagesize 999;
set newpage 0;
set feedback off;
set heading off;
set verify off;

rem First create the syntax to determine the cardinality . . .


spool idx1.sql;

select 'set termout off;' from dual;
select 'spool idx2.lst;' from dual;
select 'column card format 9,999,999;' from dual;

select 'select distinct count(distinct '
||a.column_name
||') card, '
||''' is the cardinality of '
||'Index '
||a.index_name
||' on column '
||a.column_name
||' of table '
||a.table_owner
||'.'
||a.table_name
||''' from '
||index_owner||'.'||a.table_name
||';'
from Remote DBA_ind_columns a, Remote DBA_indexes b
SEE CODE DEPOT FOR FULL SCRIPT
;


This is an excerpt from "High Performance Data Warehousing", copyright 1997. To learn more about Oracle, try "Oracle Tuning: The Definitive Reference", by Donald K. Burleson.  You can buy it direct from the publisher at 30% off here:
http://www.rampant-books.com/book_1002_oracle_tuning_definitive_reference_2nd_ed.htm

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