sql加了hints sql_id就发生变化

v$sql

v$sql 列出统计信息在shared SQL areas 没有GROUP BY 字句,

每行包含每个原始SQL文本的每个child 

v$sql 显示的统计信息是通常更新在查询执行尾端。

v$sqlarea:

v$sqlarea 

v$sqlarea 显示统计信息在恭喜SQL区域,每个SQL语句 一行


测试1：

先清空shared pool:

SQL>  alter system flush shared_pool;

System altered.

SQL> select count(*) from v$sql;

  COUNT(*)
----------
    51

SQL>  select count(*) from v$sqlarea;

  COUNT(*)
----------
    86

SQL> alter system flush shared_pool;

System altered.

create unique index KLNL_DKKHMX_IDX1 on KLNL_DKKHMX (MINGXIBH, DKJIEJUH, FARENDMA);

create index KLNL_DKKHMX_IDX3 on KLNL_DKKHMX (DKJIEJUH, FARENDMA);

select nvl(max(to_number(mingxibh)), 0) as lMaxXuhao from klnl_dkkhmx
where dkjiejuh='2018062700000655'  
and farendma='9999'           and
trim(translate(mingxibh,'0123456789',' ')) is null;


SQL> explain plan for select nvl(max(to_number(mingxibh)), 0) as lMaxXuhao
  from klnl_dkkhmx
 where dkjiejuh = '20151020000935'
   and farendma = '9999'
   and trim(translate(mingxibh, '0123456789', ' ')) is null;  2    3    4    5  

Explained.

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

PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Plan hash value: 898418289

-------------------------------------------------------------------------------------------------
| Id  | Operation             | Name        | Rows    | Bytes | Cost (%CPU)| Time    |
-------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT         |            |     1 |    46 |     5   (0)| 00:00:01 |
|   1 |  SORT AGGREGATE          |            |     1 |    46 |         |        |
|*  2 |   TABLE ACCESS BY INDEX ROWID| KLNL_DKKHMX    |     1 |    46 |     5   (0)| 00:00:01 |
|*  3 |    INDEX RANGE SCAN         | KLNL_DKKHMX_IDX3 |     2 |    |     3   (0)| 00:00:01 |
-------------------------------------------------------------------------------------------------

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

   2 - filter(TRIM(TRANSLATE("MINGXIBH",'0123456789',' ')) IS NULL)
   3 - access("DKJIEJUH"='20151020000935' AND "FARENDMA"='9999')

16 rows selected.



SQL> col sql_text format a20
SQL> select sql_id,sql_text,version_count,loads,hash_value,address,plan_hash_value,old_hash_value, last_active_child_address from v$sqlarea a where a.sql_id='67wvhym3apr0k';

SQL_ID          SQL_TEXT           VERSION_COUNT      LOADS HASH_VALUE ADDRESS        PLAN_HASH_VALUE OLD_HASH_VALUE LAST_ACTIVE_CHIL
------------- -------------------- ------------- ---------- ---------- ---------------- --------------- -------------- ----------------
67wvhym3apr0k select nvl(max(to_nu           1      1 3333086226 00000000E0220A88       898418289     1481984114 00000000E0722260
          mber(mingxibh)), 0)
          as lMaxXuhao   from
          klnl_dkkhmx  where d
          kjiejuh = '201510200
          00935'    and farend
          ma = '9999'    and t
          rim(translate(mingxi
          bh, '0123456789', '
          ')) is null

SQL>    SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR('67wvhym3apr0k',0));

PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
SQL_ID    67wvhym3apr0k, child number 0
-------------------------------------
select nvl(max(to_number(mingxibh)), 0) as lMaxXuhao   from klnl_dkkhmx
 where dkjiejuh = '20151020000935'    and farendma = '9999'    and
trim(translate(mingxibh, '0123456789', ' ')) is null

Plan hash value: 898418289

-------------------------------------------------------------------------------------------------
| Id  | Operation             | Name        | Rows    | Bytes | Cost (%CPU)| Time    |
-------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT         |            |    |    |     5 (100)|        |
|   1 |  SORT AGGREGATE          |            |     1 |    46 |         |        |
|*  2 |   TABLE ACCESS BY INDEX ROWID| KLNL_DKKHMX    |     1 |    46 |     5   (0)| 00:00:01 |
|*  3 |    INDEX RANGE SCAN         | KLNL_DKKHMX_IDX3 |     2 |    |     3   (0)| 00:00:01 |
-------------------------------------------------------------------------------------------------

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

   2 - filter(TRIM(TRANSLATE("MINGXIBH",'0123456789',' ')) IS NULL)
   3 - access("DKJIEJUH"='20151020000935' AND "FARENDMA"='9999')


23 rows selected.



SQL>    select sql_id,a.sql_text, a.LOADED_VERSIONS,a.hash_value,a.ADDRESS,a.OLD_HASH_VALUE,a.plan_hash_value,a.child_number, a.child_address from v$sql a where a.sql_id='67wvhym3apr0k';

SQL_ID          SQL_TEXT           LOADED_VERSIONS HASH_VALUE ADDRESS           OLD_HASH_VALUE  PLAN_HASH_VALUE   CHILD_NUMBER   CHILD_ADDRESS
------------- -------------------- --------------- ---------- ---------------- -------------- --------------- ------------ ----------------
67wvhym3apr0k select nvl(max(to_nu         1 3333086226 00000000E0220A88       1481984114        898418289           0           00000000E0722260
          mber(mingxibh)), 0)
          as lMaxXuhao   from
          klnl_dkkhmx  where d
          kjiejuh = '201510200
          00935'    and farend
          ma = '9999'    and t
          rim(translate(mingxi
          bh, '0123456789', '
          ')) is null



SQL> set linesize 200
SQL> explain plan for select /*+INDEX(klnl_dkkhmx KLNL_DKKHMX_IDX1)*/ nvl(max(to_number(mingxibh)), 0) as lMaxXuhao
  from klnl_dkkhmx
 where dkjiejuh = '20151020000935'
   and farendma = '9999'
   and trim(translate(mingxibh, '0123456789', ' ')) is null;
     2    3    4    5  
Explained.


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

PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Plan hash value: 4239695997

-------------------------------------------------------------------------------------
| Id  | Operation     | Name         | Rows  | Bytes | Cost (%CPU)| Time     |
-------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT |            |      1 |     46 |  1766   (0)| 00:00:22 |
|   1 |  SORT AGGREGATE  |            |      1 |     46 |         |        |
|*  2 |   INDEX SKIP SCAN| KLNL_DKKHMX_IDX1 |      1 |     46 |  1766   (0)| 00:00:22 |
-------------------------------------------------------------------------------------

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

   2 - access("DKJIEJUH"='20151020000935' AND "FARENDMA"='9999')
       filter("DKJIEJUH"='20151020000935' AND
          TRIM(TRANSLATE("MINGXIBH",'0123456789',' ')) IS NULL AND "FARENDMA"='9999')

16 rows selected.


SQL> col sql_text format a100
SQL> select sql_text,sql_id from v$sqlarea a where a.sql_text like '%klnl_dkkhmx%';

SQL_TEXT                                                 SQL_ID
---------------------------------------------------------------------------------------------------- -------------
select /*+INDEX(klnl_dkkhmx KLNL_DKKHMX_IDX1)*/ nvl(max(to_number(mingxibh)), 0) as lMaxXuhao    from brc3fx39un2ft
 klnl_dkkhmx  where dkjiejuh = '20151020000935'    and farendma = '9999'    and trim(translate(mingx
ibh, '0123456789', ' ')) is null




select nvl(max(to_number(mingxibh)), 0) as lMaxXuhao   from klnl_dkkhmx  where dkjiejuh = '201510200 67wvhym3apr0k
00935'      and farendma = '9999'    and trim(translate(mingxibh, '0123456789', ' ')) is null

select sql_id,sql_text,version_count,loads,hash_value,address,plan_hash_value,old_hash_value, last_a 9aw6mstmg9x22
ctive_child_address from v$sqlarea a where a.sql_text like '%klnl_dkkhmx%'

select * from v$sqlarea a where a.sql_text like '%klnl_dkkhmx%'                      4sawk3nuxk59t
explain plan for select nvl(max(to_number(mingxibh)), 0) as lMaxXuhao    from klnl_dkkhmx  where dkji 1xckyuaumyvmz
ejuh = '20151020000935'    and farendma = '9999'    and trim(translate(mingxibh, '0123456789', ' '))
 is null

select sql_text,sql_id from v$sqlarea a where a.sql_text like '%klnl_dkkhmx%'                 c1hbcgaqdb3hr
select sql_text,version_count,loads,hash_value,address,plan_hash_value,old_hash_value, last_active_c 076nfx1q63gbw
hild_address from v$sqlarea a where a.sql_text like '%klnl_dkkhmx%'


10 rows selected.