Vishal desai’s Oracle Blog

January 24, 2014

Build Bind Variables from v$sql_monitor binds_xml column

Filed under: SQL, Troubleshooting — vishaldesai @ 7:41 pm

One of my client had interesting SQL performance issue. Whenever client executes query from ab initio it takes forever and same SQL code from sqlplus runs in less than a minute. Both tools were producing different plan_hash_value. I looked at v$ses_optimizer_env to ensure there were no session level parameters set for ab initio session.

I wanted to run exact SQL from sqlplus, create sql plan baseline so that when SQL is submitted from AI it can use good plan. AI was generating SQL dynamically so I decided get exact SQL text, bind variables and values from v$sql_monitor. I defined bind variables, assigned values and ran SQL from sqlplus and created profile which was eventually used by AI. To automate constructing bind variables and SQL Text from v$sql_monitor, I wrote script called build_bind_sqlmontior.sql.

Script will prompt for Key, SID and SQL_ID. Enter value for at least on prompt and later on enter key value to construct bind variables and SQL Text as shown below:

SQL> @build_bind_sqlmonitor.sql
Please enter the value for Key if known       :
Please enter the value for Sid if known       : 986
Please enter the value for sql_id if known    :

             KEY STATUS              USERNAME   MODULE                      SID SQL_ID        FIRST_REFRESH_TIME   PROGRAM         SQL_TEXT
---------------- ------------------- ---------- -------------------- ---------- ------------- -------------------- --------------- --------------------
   6996503228544 DONE (ALL ROWS)     SYS        sqlplus.exe                 986 8wy5mjmh53vxf 01/24/14 10:41:56    sqlplus.exe     select /*+ monitor f
   8362302828663 DONE (ERROR)        SYS        sqlplus.exe                 986 4bkxr36kasm7s 01/24/14 10:40:51    sqlplus.exe     select /*+ monitor f
  16471201083509 DONE (ERROR)        SYS        sqlplus.exe                 986 azb329svj1ajd 01/24/14 10:39:36    sqlplus.exe     select /*+ monitor f
   7082402574450 DONE (ERROR)        SYS        sqlplus.exe                 986 3036w6mx13rq5 01/24/14 10:38:36    sqlplus.exe     select /*+ monitor f
   5845451993201 DONE (ERROR)        SYS        sqlplus.exe                 986 20fmy44010wvw 01/24/14 10:38:00    sqlplus.exe     select /*+ monitor f
  11643657842205 DONE (ALL ROWS)                                            986 bfjf698jtp6n1 01/24/14 03:10:14
   7421704990227 DONE                                                       986 2vn8ztuzaq3k4 01/24/14 03:10:11
  14856293379585 DONE (ALL ROWS)                                            986 53afdbcv9637w 01/24/14 03:10:10
Please enter Key from above       : 6996503228544

variable SYS_B_0 VARCHAR2(32);
variable SYS_B_1 VARCHAR2(32);
variable SYS_B_2 NUMBER;

exec :SYS_B_0 := '31-OCT-12 00.00.00';
exec :SYS_B_1 := 'DD-MON-YY HH24:MI:SS';
exec :SYS_B_2 := 30205578;

select /*+ monitor full(ism) */ *
from ism.table_name ism
where col1=to_date(:"SYS_B_0",:"SYS_B_1")
and   col2=:"SYS_B_2";

SQL> variable SYS_B_0 VARCHAR2(32);
SQL> variable SYS_B_1 VARCHAR2(32);
SQL> variable SYS_B_2 NUMBER;
SQL> exec :SYS_B_0 := '31-OCT-12 00.00.00';

PL/SQL procedure successfully completed.

SQL> exec :SYS_B_1 := 'DD-MON-YY HH24:MI:SS';

PL/SQL procedure successfully completed.

SQL> exec :SYS_B_2 := 30205578;

PL/SQL procedure successfully completed.

SQL> select /*+ monitor full(ism) */ *
  2  from ism.table_name ism
  3  where col1=to_date(:"SYS_B_0",:"SYS_B_1")
  4  and   col2=:"SYS_B_2";


1 row selected.

Download Script

If there is any data type conversion script may not produce reliable output.


  1. Can be very useful. Could you please fix the download link?
    Thanks. Oleg

    Comment by Oleg — January 31, 2014 @ 10:17 pm

    • Hi Oleg,

      It’s fixed now.


      Comment by vishaldesai — February 2, 2014 @ 5:01 pm

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