Measure plsql execution time

Hello dear teachers,
i would be gratful for advice.
I have materialized view that is refreshed with the dbms_mview procedure and it's scheduled through dbms_job.
How could i measure that refresh execution time so i can for example query one table and have in there when this job(refreshing) started , and when did it finish ?
I could do set timing on in sqlplus , but is there somthing like that in plsql and than insert that time in some table ?
i am on 9.2.0.7.

set serverout on
declare
start_time number;
elapsed number;
begin
select to_char(sysdate,'sssss') into start_time from dual;
-- put here your code
select to_char(sysdate,'sssss')-start_time into elapsed from dual;
dbms_output.put_line ('Elapsed='||elapsed);
end;
/You can use systimestamp to get a more precise result.
Max
[My Italian Oracle blog|http://oracleitalia.wordpress.com]

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    Edited by: Liang Ji on Mar 29, 2008 5:42 AM

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