Testing how long an SQL script will takfe to run

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Database
IBM DB2
Oracle
Running Oracle 9.2.x. We have to sun a couple of SQL scripts that will make some changes to tables/data. Is there a way of finding out approximately how long these scripts will take without actually running them? Is there some tool I can use to do this? Or some rule of thumb?

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Test the scripts in a test environment (wiht small proportionally tables) and turn on the timing session parameter with “set timing on;” or capture the begining and the end of the execution whit a “spool command” or “set serveroutput on 10000; and the dbms_output package.” to printscreen the result.

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