Cursor_Sharing = Force and queries with literal comparisons forcing FTS

Hi all

I have the following scenario:

  • Oracle 11.2.0.3
  • A 3rd party application, requiring cursor_sharing = TRUE
  • A table (T2310) with an indexed field (C1000000161), which has no duplicate values
  • Cause the Mode Cache = force (don't think it's relevant in the present case, but its here to justify its appearance in the explain output)

In this scenario, the 3rd party application run queries like the one below (I have to use the trick here, given that the explanation will not show the FTS):

        SQL> select /*+ GATHER_PLAN_STATISTICS */ C1000000161 
        > from aradmin.T2310 
        > where C1000000161 = 'INC000002137945' or ('a' = 'b');

This type of query will eventually force a full table scan:

    SQL> SELECT * FROM table(DBMS_XPLAN.DISPLAY_CURSOR(FORMAT=>'ALLSTATS LAST'));

    PLAN_TABLE_OUTPUT
    --------------------------------------------------------------------------------------------------------------------
    SQL_ID  f3njwvkb0yf1x, child number 0
    -------------------------------------
    select /*+ GATHER_PLAN_STATISTICS */ C1000000161 from
    aradmin.T2310 where C1000000161 = :"SYS_B_0" or (:"SYS_B_1"
    = :"SYS_B_2")

    Plan hash value: 1862236576

    --------------------------------------------------------------------------------------------------------------------
    | Id  | Operation          | Name                       | Starts | E-Rows | A-Rows |   A-Time   | Buffers | Reads  |
    --------------------------------------------------------------------------------------------------------------------

    PLAN_TABLE_OUTPUT
    --------------------------------------------------------------------------------------------------------------------
    |   0 | SELECT STATEMENT   |                            |      1 |        |      0 |00:03:00.20 |    3964K|    161K|
    |   1 |  RESULT CACHE      | bkhyzz7n945syc4numpbs27y20 |      1 |        |      0 |00:03:00.20 |    3964K|    161K|
    |*  2 |   TABLE ACCESS FULL| T2310                      |      1 |  44030 |      0 |00:03:00.20 |    3964K|    161K|
    --------------------------------------------------------------------------------------------------------------------

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

       2 - filter((:SYS_B_1=:SYS_B_2 OR "T2310"."C1000000161"=:SYS_B_0))

    Result Cache Information (identified by operation id):

    PLAN_TABLE_OUTPUT
    --------------------------------------------------------------------------------------------------------------------
    ------------------------------------------------------

       1 -

As we can see in the explanation, literals are replaced with bind variables, and I think that it is forcing the FTS. If you remove the literal comparison, the index is used as intended.

So my question is: is it possible to avoid this behavior on the side of the database?

Thank you!

As you say, we have two possible plans, we want to either that each row in the table or we want to use our predicate of the column. If we let the plan for both possibilities should have acceptable performance for the typical case (: SYS_B_1<>: SYS_B_2) and correct the results in the case of equality.

If sql is rewritable I would do something like

Select / * + GATHER_PLAN_STATISTICS * / C1000000161
of t2310
where C1000000161 =: b1
and (: b2 <> : b3 or: b2 is null or: b3 is null)
Union of all the
Select C1000000161
of t2310
where: = b2: b3;

The or_expand indicator (undocumented, but I find it more easy to set use_concat) could be useful to force the regime to take this shape without having to rewrite the query.

create table t2310 (pk_col, C1000000161 VARCHAR2 (100 CHAR), constraint t2310_pk primary key (pk_col));
create index t2310_161 on t2310 (C1000000161);
Insert into t2310
Select rownum, dbms_random.string ('U', 3) | To_char(rowNum,00000000000000)
of the double
connect by rownum<=>
commit;
exec dbms_Stats.gather_Table_stats (user, 't2310')
ALTER session set cursor_sharing = force;

Select / * + OR_EXPAND(t2310 C1000000161) GATHER_PLAN_STATISTICS * / C1000000161
of t2310
where C1000000161 = 'INC000002137946' or ("a" = "b");
SELECT * FROM table (DBMS_XPLAN. DISPLAY_CURSOR (FORMAT-ONLINE 'ALLSTATS LAST'));

Hash value of plan: 928588817

-------------------------------------------------------------------------------------------
| ID | Operation | Name | Begins | E - lines. A - lines.  A - time | Pads |
-------------------------------------------------------------------------------------------
|  0 | SELECT STATEMENT |          |      1.        |      0 | 00:00:00.01 |      2.
|  1.  CONCATENATION.          |      1.        |      0 | 00:00:00.01 |      2.
|*  2 |  INDEX RANGE SCAN | T2310_161 |      1.      6.      0 | 00:00:00.01 |      2.
|*  3 |  FILTER |          |      1.        |      0 | 00:00:00.01 |      0 |
|*  4 |    TABLE ACCESS FULL | T2310 |      0 |  99994 |      0 | 00:00:00.01 |      0 |
-------------------------------------------------------------------------------------------

Information of predicates (identified by the operation identity card):
---------------------------------------------------

2 - access("C1000000161"=:SYS_B_0)
3 - filter(:SYS_B_1=:SYS_B_2)
4 filter (LNNVL ("C1000000161" =: SYS_B_0))

Now, you can use a plan for this sql database attach to the sql application:

Select / * + GATHER_PLAN_STATISTICS * / C1000000161
of t2310
where C1000000161 = 'INC000002137946' or ("a" = "b");
SELECT * FROM table (DBMS_XPLAN. DISPLAY_CURSOR (FORMAT-ONLINE 'ALLSTATS LAST'));

Hash value of plan: 1862236576

-------------------------------------------------------------------------------------
| ID | Operation | Name | Begins | E - lines. A - lines.  A - time | Pads |
-------------------------------------------------------------------------------------
|  0 | SELECT STATEMENT |      |      1.        |      0 | 00:00:00.03 |    248.
|*  1 |  TABLE ACCESS FULL | T2310 |      1.  1006 |      0 | 00:00:00.03 |    248.
-------------------------------------------------------------------------------------

Information of predicates (identified by the operation identity card):
---------------------------------------------------

1 Filter ((: SYS_B_1 =: SYS_B_2 or "C1000000161" =: SYS_B_0))

@sql_find t2310

CHILD_NUMBER PLAN_HASH_VALUE LAST_ACTIVE_TIME EXECUTIONS SQL_TEXT SQL_ID
------------- ------------ --------------- ------------------- ---------- ----------------------------------------------------------------------------------------------------
34k49g78s1w5w 453626665 04/01/2016 0 22:55:11 1 Select / * + no_parallel_index (t, "T2310_PK") cursor_sharing_exact use_weak_name_resl dyn dbms_stats
cnsa5smf77n8w 2274106110 04/01/2016 0 22:55:11 1 Select / * + no_parallel_index (t, "T2310_161") use_weak_name_resl cursor_sharing_exact, dbms_stats dy
1cyhgv72abcf5 928588817 04/01/2016 0 22:55:11 1 Select / * + OR_EXPAND(t2310 C1000000161) GATHER_PLAN_STATISTICS * / t2310 C1000000161 where C1000
gv84zvt3hagrk 1862236576 04/01/2016 0 22:55:11 1 Select / * + GATHER_PLAN_STATISTICS * / C1000000161 t2310 where C1000000161 =: 'SYS_B_0' or (: "SYS)
2z5dv340ttwc3 0 0 01/04/2016-22:55:11 1 BEGIN dbms_Stats.gather_Table_stats (user, 't2310'); END;

number of plans of var
exec: plans: = dbms_spm.load_plans_from_cursor_cache(sql_id=>'gv84zvt3hagrk',plan_hash_value=>1862236576)

print plans
PLANS
--------
1

Select the SQL_HANDLE column, plan_name, sql_Text dba_sql_plan_baselines;

SQL_HANDLE PLAN_NAME SQL_TEXT
------------------------------ ------------------------------ ---------------------------------------------------------
SQL_32cad750b449f08a SQL_PLAN_35kqra2u4mw4a24696a58 select / * + GATHER_PLAN_STATISTICS * / C1000000161
of t2310
where C1000000161 =
               
               
exec: plans: = dbms_spm.load_plans_from_cursor_cache (sql_id-online '1cyhgv72abcf5', plan_hash_value-online 928588817, sql_handle => 'SQL_32cad750b449f08a')
Select the SQL_HANDLE column, plan_name, sql_Text dba_sql_plan_baselines;
SQL_HANDLE PLAN_NAME SQL_TEXT
------------------------------ ------------------------------ -----------------------------------------------------
SQL_32cad750b449f08a SQL_PLAN_35kqra2u4mw4a24696a58 select / * + GATHER_PLAN_STATISTICS * / C1000000161
of t2310
where C1000000161 =

SQL_32cad750b449f08a SQL_PLAN_35kqra2u4mw4af7b73bde select / * + GATHER_PLAN_STATISTICS * / C1000000161
of t2310
where C1000000161 =

exec: plans: = dbms_spm.alter_sql_plan_baseline(sql_handle=>'SQL_32cad750b449f08a',plan_name=>'SQL_PLAN_35kqra2u4mw4a24696a58',attribute_name=>'enabled',attribute_value=>'NO')

Select / * + GATHER_PLAN_STATISTICS * / C1000000161
of t2310
where C1000000161 = 'INC000002137946' or ("a" = "b");
SELECT * FROM table (DBMS_XPLAN. DISPLAY_CURSOR (FORMAT-ONLINE 'ALLSTATS LAST'));

Hash value of plan: 928588817

-------------------------------------------------------------------------------------------
| ID | Operation | Name | Begins | E - lines. A - lines.  A - time | Pads |
-------------------------------------------------------------------------------------------
|  0 | SELECT STATEMENT |          |      1.        |      0 | 00:00:00.01 |      2.
|  1.  CONCATENATION.          |      1.        |      0 | 00:00:00.01 |      2.
|*  2 |  INDEX RANGE SCAN | T2310_161 |      1.      6.      0 | 00:00:00.01 |      2.
|*  3 |  FILTER |          |      1.        |      0 | 00:00:00.01 |      0 |
|*  4 |    TABLE ACCESS FULL | T2310 |      0 |  99994 |      0 | 00:00:00.01 |      0 |
-------------------------------------------------------------------------------------------

Information of predicates (identified by the operation identity card):
---------------------------------------------------

2 - access("C1000000161"=:SYS_B_0)
3 - filter(:SYS_B_1=:SYS_B_2)
4 filter (LNNVL ("C1000000161" =: SYS_B_0))

Note
-----
-Basic plan SQL SQL_PLAN_35kqra2u4mw4af7b73bde used for this statement

As you can see, line 4 is running at all because of the filter in line 3 (start = 0 where id = 4)

Tags: Database

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