oracle inserting data

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I m trying to copy data from one table in oracle to another
both tables have different column names
i take data in dataset from one table and insert in another table
there are 28000 records
it takes 6 minutes to load
this much time not allowed
how can i minimize this time?

Posted 13-Jul-11 3:06am

Member 8081020

Updated 13-Jul-11 3:09am

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Rhys Gravell · Answer 1 · 2011-07-13T03:21:00

Solution 1

Write a (parameterised if needed) stored procedure to perform a set based insert and call the sp rather than loading the data and doing a one row at a time insert;

INSERT INTO A
(
    COLUMN_A
    ,COLUMN_B
    ,COLUMN_C
    ,COLUMN_D
)
SELECT
    COLUMN_W
    ,COLUMN_X
    ,COLUMN_Y
    ,COLUMN_Z
FROM
    B
WHERE
    B.COLUMN_Z = @MyParameter;

Posted 13-Jul-11 3:21am

Rhys Gravell

Comments

Kim Togo 13-Jul-11 11:37am

Good call. My 5.

Shameel · Answer 2 · 2011-07-13T03:42:00

It depends on the number of columns, the data type of the columns and the size of data in each row. But generally, if you have defined indexes in your target table, disable the indexes, insert the rows and then re-enable the indexes. During bulk updates, indexes are updated which adds to the overhead.