Question:
I have debugged my PL/SQL with dbms_output.put_line statements and
how that the job is moving into production I need to know where the
output would be written. I know that the put_line
statements are not written anywhere when the PL/SQL is inside a
scheduled job. Does leaving the dbms_output.put_line
statements cause overhead in a production shell script job? Also,
how can I display the output of my dbms_output.put_line
when running the code within a batch job using dbms_scheduler?
Answer: Normally, people
change from dbms_output to utl_file for batch jobs,
but that is not required.
Even if a
dbms_output.put_line writes to /dev/null, the statements
still add overhead . . . .
When I move code into production, I comment out the
dbms_output statements and leave them in the code, in case
I ever need to debug it!
The
put_line works with SQL*Plus when you "set serveroutput
on".
If the job is a UNIX/Linux shell script or a
dbms_scheduler job, you can try using the spool command,
since the PL/SQL is executed via a call to SQL*Plus.
Jon Emmons has lots of working examples in his book "Oracle
Shell Scripting".
Below, we directly spool the output within the PL/SQL, provided that
you invoke the PL/SQL via a call to SQL*Plus:
#!/bin/ksh
# First, we must set the environment . . . .
ORACLE_SID=mon1
export ORACLE_SID
ORACLE_HOME=`cat
/etc/oratab|grep ^$ORACLE_SID:|cut -f2 -d':'`
export ORACLE_HOME
PATH=$ORACLE_HOME/bin:$PATH
export PATH
$ORACLE_HOME/bin/sqlplus system/manager<<!
SET
SERVEROUTPUT ON
SPOOL /tmp/mytrace.txt
BEGIN
. . .
DBMS_OUTPUT.PUT_LINE
END;
/
spool off
!
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