Need suggestions for improving sql query.

Hi,
There is an sql query which loads data into a single table from 80 other tables which are loaded with data from different sites.The sql query to load from these 80 tables into single table is taking almost 40 min everyday with 6-7 million records.
The notation followed
the table is truncated first and then the constraints are disabled.
insert into single table (column1,column2,column3)
( select * from table1
union all
select * from table2
union all
select * from table3
union all
select * from table80);
enable the constraints.
The database is 10.2.0.3.Is there any other way that can be implemented or modified this to get a better response time to load the data faster.
Thanks

A lot of IFs, but
if you have a licence for the partitioning option, and
if the data has some convenient partitioning column - such as a 'site' column which could be used for list partitioning, and
if you don't need the separate tables to exist after you have consolidated the data
if you can create all other necessary constraints on the base tables,
you could:
create main table as empty, but partitioned with 80 empty partitions
exchange partition with table 80 times in a row.
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk

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987981 wrote:
I was trying to improve the performance of the below query. I tried the following methods used merge instead of update, used bulk collect / Forall update, used ordered hint, created a temp table and upadated the target table using the same. The methods which I used did not improve any performance. And that meant what? Surely if you spend all that time and effort to try various approaches, it should mean something? Failures are as important teachers as successes. You need to learn from failures too. :-)
The data count which is updated in the target table is 2 million records and the target table has 15 million records.Tables have rows btw, not records. Database people tend to get upset when rows are called records, as records exist in files and a database is not a mere collection of records and files.
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2 hours to load just 3 GB of data seems unreasonable regardless of the SQL Loader settings. It seems likely to me that the problem is not with SQL Loader but somewhere else.
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SQL Command : SQL query either with SQL variable or any condition or simple Sql statement
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Please Mark This As Answer or vote for Helpful Post if this helps you to solve your question/problem. http://techequation.com

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order_line_id NUMBER,
quantity NUMBER,
order_type NUMBER
CREATE TABLE order_tmp
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INSERT INTO demand_tmp
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12438     82                 821                 100       30
12438     82                 849                 350       30
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12438     82                    0                  50       -1
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Edited by: Venkat Rakesh on Oct 7, 2012 6:32 PM
Edited by: Venkat Rakesh on Oct 7, 2012 8:39 PM

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For example include a column ID in the master table which is filled with a sequence and include that field as a foreign key in the detail table.
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Regards,
Bas
btw, using the INNER JOIN and OUTER JOIN syntax in your SQL makes it better readable, since you're separating join conditions from the where clause, just a tip ;)

Need suggestions for improving sql query.

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