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Setting SQL bind variables

Oracle Database Tips by Donald Burleson


Oracle ACE Laurent Schneider published this great tip on setting SQL bind variables in SQL*Plus: 

SQL> var y varchar2(255)
SQL> exec :y:='SCOTT'
PL/SQL procedure successfully completed.
SQL> select job from emp where ename=:y;


Laurent also shows how to use the v$sql_bind_capture view to verify the replacement of a bind variable with a literal in SQL:


SQL> select sql_text,name,value_string,datatype_string
2 from v$sql_bind_capture join v$sql using (hash_value)
3 where sql_text like
4 'select job from emp where ename=:y%';

SQL_TEXT                          NAME VALUE DATATYPE_STRING
------------------------------------- ---- ----- ------------
select job from emp where ename=:y :Y SCOTT VARCHAR2(2000)


If you like Oracle tuning, see the book "Oracle Tuning: The Definitive Reference", with 950 pages of tuning tips and scripts. 

You can buy it direct from the publisher for 30%-off and get instant access to the code depot of Oracle tuning scripts.



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