NVL and deterministic function

Hi all
I recently found a note on deterministic function and its use. As usual check and validate with various relevant articles on the same topic. I decided to check the importance of it with an example below.

  
 create table rnd_all_objects as select * from all_objects;
   
 create or replace function RND_check_null_var(p_var in varchar)
    return varchar2
  deterministic
    as
    begin
       if p_var is null then
          return 'X';
       else
          return p_var;
      end if;
 end;

 create index rnd_DET on rnd_all_objects (rnd_check_null_var(status));

 select COUNT('X') from rnd_all_objects 
 --where status is null  
  where RND_check_null_var(status) = 'X'

 /*
  One can check the plan of the query by commenting the 3rd line of query and uncommenting 2nd line to compare the performance.
 */
The example given, it seems if we happen to use deterministic functions and replace NVL in where clause if appropriate and possible its picking the index created and the query is very effective. We have tested with more records too. This is to say that the index is selected, even when records are questioned are even more than 90% of all of the data in the table for the given condition, is not happens on a normal basis.

I pray the pros discuss and get rid of my doubts.

Thanks in advance.

Here's what I mean:

After doing this:

 create index rnd_1 on rnd_all_objects (rnd_check_null_var(status));
 create index rnd_2 on rnd_all_objects (nvl(status,'X'));
 create index rnd_3 on rnd_all_objects (status,'X');

And then what follows, I see no difference between NVL and deterministic function.

Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> set lines 120
SQL> set pages 999
SQL> SELECT *
  2  FROM   rnd_all_objects
  3  WHERE  rnd_check_null_var(status) = 'X';

no rows selected

SQL>
SQL> select * from table(dbms_xplan.display_cursor);

PLAN_TABLE_OUTPUT
----------------------------------------------------------------------------------------------------
SQL_ID  24rfj6nz0haks, child number 0
-------------------------------------
SELECT * FROM   rnd_all_objects WHERE  rnd_check_null_var(status) = 'X'

Plan hash value: 3930105948

-----------------------------------------------------------------------------------------------
| Id  | Operation                   | Name            | Rows  | Bytes | Cost (%CPU)| Time     |
-----------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT            |                 |       |       |   117 (100)|          |
|   1 |  TABLE ACCESS BY INDEX ROWID| RND_ALL_OBJECTS |   428 |   902K|   117   (0)| 00:00:02 |
|*  2 |   INDEX RANGE SCAN          | RND_1           |   171 |       |   114   (0)| 00:00:02 |
-----------------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   2 - access("RND_ALL_OBJECTS"."SYS_NC00016$"='X')

Note
-----
   - dynamic sampling used for this statement (level=2)

23 rows selected.

SQL>
SQL> SELECT COUNT(*)
  2  FROM   rnd_all_objects
  3  WHERE  rnd_check_null_var(status) = 'X';

  COUNT(*)
----------
         0

SQL>
SQL> select * from table(dbms_xplan.display_cursor);

PLAN_TABLE_OUTPUT
----------------------------------------------------------------------------------------------------
SQL_ID  9pkp2u9xyfd5f, child number 0
-------------------------------------
SELECT COUNT(*) FROM   rnd_all_objects WHERE
rnd_check_null_var(status) = 'X'

Plan hash value: 2866958763

---------------------------------------------------------------------------
| Id  | Operation         | Name  | Rows  | Bytes | Cost (%CPU)| Time     |
---------------------------------------------------------------------------
|   0 | SELECT STATEMENT  |       |       |       |     1 (100)|          |
|   1 |  SORT AGGREGATE   |       |     1 |     6 |            |          |
|*  2 |   INDEX RANGE SCAN| RND_1 |     1 |     6 |     1   (0)| 00:00:01 |
---------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   2 - access("RND_ALL_OBJECTS"."SYS_NC00016$"='X')

20 rows selected.

SQL>
SQL> SELECT *
  2  FROM   rnd_all_objects
  3  WHERE  nvl(status,'X') = 'X';

no rows selected

SQL>
SQL> select * from table(dbms_xplan.display_cursor);

PLAN_TABLE_OUTPUT
----------------------------------------------------------------------------------------------------
SQL_ID  762n8j14mpqk1, child number 1
-------------------------------------
SELECT * FROM   rnd_all_objects WHERE  nvl(status,'X') = 'X'

Plan hash value: 2211738098

-----------------------------------------------------------------------------------------------
| Id  | Operation                   | Name            | Rows  | Bytes | Cost (%CPU)| Time     |
-----------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT            |                 |       |       |   117 (100)|          |
|   1 |  TABLE ACCESS BY INDEX ROWID| RND_ALL_OBJECTS |   428 | 69764 |   117   (0)| 00:00:02 |
|*  2 |   INDEX RANGE SCAN          | RND_2           |   171 |       |   114   (0)| 00:00:02 |
-----------------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   2 - access("RND_ALL_OBJECTS"."SYS_NC00017$"='X')

Note
-----
   - dynamic sampling used for this statement (level=2)

23 rows selected.

SQL>
SQL> SELECT COUNT(*)
  2  FROM   rnd_all_objects
  3  WHERE  nvl(status,'X') = 'X';

  COUNT(*)
----------
         0

SQL>
SQL> select * from table(dbms_xplan.display_cursor);

PLAN_TABLE_OUTPUT
----------------------------------------------------------------------------------------------------
SQL_ID  0bhwd0rc3g7pp, child number 0
-------------------------------------
SELECT COUNT(*) FROM   rnd_all_objects WHERE  nvl(status,'X') = 'X'

Plan hash value: 1668065865

---------------------------------------------------------------------------
| Id  | Operation         | Name  | Rows  | Bytes | Cost (%CPU)| Time     |
---------------------------------------------------------------------------
|   0 | SELECT STATEMENT  |       |       |       |     1 (100)|          |
|   1 |  SORT AGGREGATE   |       |     1 |     6 |            |          |
|*  2 |   INDEX RANGE SCAN| RND_2 |     1 |     6 |     1   (0)| 00:00:01 |
---------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   2 - access("RND_ALL_OBJECTS"."SYS_NC00017$"='X')

19 rows selected.

SQL>
SQL> SELECT *
  2  FROM   rnd_all_objects
  3  WHERE  status is null;

no rows selected

SQL>
SQL> select * from table(dbms_xplan.display_cursor);

PLAN_TABLE_OUTPUT
----------------------------------------------------------------------------------------------------
SQL_ID  b2zw36qjc8nxq, child number 0
-------------------------------------
SELECT * FROM   rnd_all_objects WHERE  status is null

Plan hash value: 2472515261

-----------------------------------------------------------------------------------------------
| Id  | Operation                   | Name            | Rows  | Bytes | Cost (%CPU)| Time     |
-----------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT            |                 |       |       |    43 (100)|          |
|   1 |  TABLE ACCESS BY INDEX ROWID| RND_ALL_OBJECTS |  2399 |   264K|    43   (0)| 00:00:01 |
|*  2 |   INDEX RANGE SCAN          | RND_3           |  2399 |       |     8   (0)| 00:00:01 |
-----------------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   2 - access("STATUS" IS NULL)

19 rows selected.

SQL>
SQL> SELECT COUNT('X')
  2  FROM   rnd_all_objects
  3  WHERE  status is null;

COUNT('X')
----------
         0

SQL>
SQL> select * from table(dbms_xplan.display_cursor);

PLAN_TABLE_OUTPUT
----------------------------------------------------------------------------------------------------
SQL_ID  03gbx96m8a4hp, child number 0
-------------------------------------
SELECT COUNT('X') FROM   rnd_all_objects WHERE  status is null

Plan hash value: 1659481815

---------------------------------------------------------------------------
| Id  | Operation         | Name  | Rows  | Bytes | Cost (%CPU)| Time     |
---------------------------------------------------------------------------
|   0 | SELECT STATEMENT  |       |       |       |     9 (100)|          |
|   1 |  SORT AGGREGATE   |       |     1 |     5 |            |          |
|*  2 |   INDEX RANGE SCAN| RND_3 |     8 |    40 |     9   (0)| 00:00:01 |
---------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   2 - access("STATUS" IS NULL)

Note
-----
   - dynamic sampling used for this statement (level=2)

23 rows selected.

Published by: DomBrooks on November 24, 2010 11:46

Tags: Database

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