python 传入类型错误 导致走index fast full scan

1.select esbflowno from esb2_trans_log where esbserviceflowno=:esbserviceflowno

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='3xs7qxkpb25r6';
 
       SQL_ID    SQL_TEXT                                                                              VERSION_COUNT        LOADS    HASH_VALUE          ADDRESS        PLAN_HASH_VALUE       OLD_HASH_VALUE    LAST_ACTIVE_CHILD_ADDRESS
1    3xs7qxkpb25r6    select esbflowno from esb2_trans_log where esbserviceflowno=:esbserviceflowno       4              6       2863732454        0000000E29F609B8    3183754604             3808660663          0000000DBAF910F0


2.
  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 = '3xs7qxkpb25r6';
  
    SQL_ID    SQL_TEXT                                                                          LOADED_VERSIONS    HASH_VALUE        ADDRESS          OLD_HASH_VALUE    PLAN_HASH_VALUE    CHILD_NUMBER    CHILD_ADDRESS
1    3xs7qxkpb25r6    select esbflowno from esb2_trans_log where esbserviceflowno=:esbserviceflowno    1            2863732454    0000000E29F609B8    3808660663           3183754604    0               0000000DF7455E30
2    3xs7qxkpb25r6    select esbflowno from esb2_trans_log where esbserviceflowno=:esbserviceflowno    1            2863732454    0000000E29F609B8    3808660663           3183754604    1               0000000DF26C6480
3    3xs7qxkpb25r6    select esbflowno from esb2_trans_log where esbserviceflowno=:esbserviceflowno    1            2863732454    0000000E29F609B8    3808660663            3183754604    2               0000000DBAF910F0
4    3xs7qxkpb25r6    select esbflowno from esb2_trans_log where esbserviceflowno=:esbserviceflowno    1            2863732454    0000000E29F609B8    3808660663            3144792666    3               0000000DBB241668


  select * from TABLE(DBMS_XPLAN.DISPLAY_CURSOR('3xs7qxkpb25r6',0));
  
  PLAN_TABLE_OUTPUT
SQL_ID  3xs7qxkpb25r6, child number 0
-------------------------------------
select esbflowno from esb2_trans_log where 
esbserviceflowno=:esbserviceflowno
 
Plan hash value: 3183754604
 
-------------------------------------------------------------------------------------------------------------
| Id  | Operation             | Name                | Rows  | Bytes | Cost (%CPU)| Time     | Pstart| Pstop |
-------------------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT      |                     |       |       |   623K(100)|          |       |       |
|   1 |  PARTITION RANGE ALL  |                     |  1444K|    64M|   623K  (1)| 02:04:44 |     1 |     9 |
|*  2 |   INDEX FAST FULL SCAN| IDX1_ESB2_TRANS_LOG |  1444K|    64M|   623K  (1)| 02:04:44 |     1 |     9 |
-------------------------------------------------------------------------------------------------------------
 
Predicate Information (identified by operation id):
---------------------------------------------------
 
   2 - filter(SYS_OP_C2C("ESBSERVICEFLOWNO")=:ESBSERVICEFLOWNO)
 

 
 
 PLAN_TABLE_OUTPUT
SQL_ID  3xs7qxkpb25r6, child number 1
-------------------------------------
select esbflowno from esb2_trans_log where 
esbserviceflowno=:esbserviceflowno
 
Plan hash value: 3183754604
 
-------------------------------------------------------------------------------------------------------------
| Id  | Operation             | Name                | Rows  | Bytes | Cost (%CPU)| Time     | Pstart| Pstop |
-------------------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT      |                     |       |       |   610K(100)|          |       |       |
|   1 |  PARTITION RANGE ALL  |                     |  1464K|    65M|   610K  (1)| 02:02:06 |     1 |     9 |
|*  2 |   INDEX FAST FULL SCAN| IDX1_ESB2_TRANS_LOG |  1464K|    65M|   610K  (1)| 02:02:06 |     1 |     9 |
-------------------------------------------------------------------------------------------------------------
 
Predicate Information (identified by operation id):
---------------------------------------------------
 
   2 - filter(SYS_OP_C2C("ESBSERVICEFLOWNO")=:ESBSERVICEFLOWNO)
 

 
 PLAN_TABLE_OUTPUT
SQL_ID  3xs7qxkpb25r6, child number 2
-------------------------------------
select esbflowno from esb2_trans_log where 
esbserviceflowno=:esbserviceflowno
 
Plan hash value: 3183754604
 
-------------------------------------------------------------------------------------------------------------
| Id  | Operation             | Name                | Rows  | Bytes | Cost (%CPU)| Time     | Pstart| Pstop |
-------------------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT      |                     |       |       |   610K(100)|          |       |       |
|   1 |  PARTITION RANGE ALL  |                     |  1464K|    65M|   610K  (1)| 02:02:06 |     1 |     9 |
|*  2 |   INDEX FAST FULL SCAN| IDX1_ESB2_TRANS_LOG |  1464K|    65M|   610K  (1)| 02:02:06 |     1 |     9 |
-------------------------------------------------------------------------------------------------------------
 
Predicate Information (identified by operation id):
---------------------------------------------------
 
   2 - filter(SYS_OP_C2C("ESBSERVICEFLOWNO")=:ESBSERVICEFLOWNO)
 

 
 PLAN_TABLE_OUTPUT
SQL_ID  3xs7qxkpb25r6, child number 3
-------------------------------------
select esbflowno from esb2_trans_log where 
esbserviceflowno=:esbserviceflowno
 
Plan hash value: 3144792666
 
-----------------------------------------------------------------------------------------------------------
| Id  | Operation           | Name                | Rows  | Bytes | Cost (%CPU)| Time     | Pstart| Pstop |
-----------------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT    |                     |       |       |    28 (100)|          |       |       |
|   1 |  PARTITION RANGE ALL|                     |     1 |    47 |    28   (0)| 00:00:01 |     1 |     9 |
|*  2 |   INDEX RANGE SCAN  | IDX1_ESB2_TRANS_LOG |     1 |    47 |    28   (0)| 00:00:01 |     1 |     9 |
-----------------------------------------------------------------------------------------------------------
 
Predicate Information (identified by operation id):
---------------------------------------------------
 
   2 - access("ESBSERVICEFLOWNO"=:ESBSERVICEFLOWNO)
 

 a.
 20.5.101.31_/root>python testesb.py 
<type 'unicode'>
[('esbapp1-esb_in-20180920083825-542762',), ('esbapp1-esb_in-20180920083825-542776',), ('esbapp4-esb_in-20180920083824-540272',), ('esbapp3-esb_in-20180920083830-541070',), ('esbapp2-esb_in-20180920083830-545483',)]
20.5.101.31_/root>cat testesb.py 
import cx_Oracle
esbserviceflowno=u'10102020180920010158019945'
print type(esbserviceflowno);
dbuser='esbdata'
dbpass='esbdata'
dbip='1.1.1.1'
dbservice='esbdb'
conn = cx_Oracle.connect(dbuser,dbpass,dbip+'/'+dbservice)
cursor = conn.cursor()
cursor.prepare("""select esbflowno from esb2_trans_log where esbserviceflowno=:esbserviceflowno""" ) 
cursor.execute(None,{'esbserviceflowno':esbserviceflowno})

d={}
info = cursor.fetchall()
print info
You have mail in /var/spool/mail/root
20.5.101.31_/root>
20.5.101.31_/root>
20.5.101.31_/root>
20.5.101.31_/root>
20.5.101.31_/root>python testesb.py 
<type 'unicode'>
[('esbapp1-esb_in-20180920083825-542762',), ('esbapp1-esb_in-20180920083825-542776',), ('esbapp4-esb_in-20180920083824-540272',), ('esbapp3-esb_in-20180920083830-541070',), ('esbapp2-esb_in-20180920083830-545483',)]
20.5.101.31_/root>

 
 
 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='3xs7qxkpb25r6';
 
 
SQL_ID       3xs7qxkpb25r6
SQL_TEXT    select esbflowno from esb2_trans_log where esbserviceflowno=:esbserviceflowno
VERSION_COUNT    4
LOADS          6
HASH_VALUE    2863732454
ADDRESS    0000000E29F609B8
PLAN_HASH_VALUE    3183754604
OLD_HASH_VALUE    3808660663
LAST_ACTIVE_CHILD_ADDRESS    0000000DBAF910F0


  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 = '3xs7qxkpb25r6';
  
     SQL_ID              SQL_TEXT    LOADED_VERSIONS    HASH_VALUE    ADDRESS    OLD_HASH_VALUE    PLAN_HASH_VALUE    CHILD_NUMBER    CHILD_ADDRESS
1    3xs7qxkpb25r6    select esbflowno from esb2_trans_log where esbserviceflowno=:esbserviceflowno    1    2863732454    0000000E29F609B8    3808660663    3183754604    0    0000000DF7455E30
2    3xs7qxkpb25r6    select esbflowno from esb2_trans_log where esbserviceflowno=:esbserviceflowno    1    2863732454    0000000E29F609B8    3808660663    3183754604    1    0000000DF26C6480
3    3xs7qxkpb25r6    select esbflowno from esb2_trans_log where esbserviceflowno=:esbserviceflowno    1    2863732454    0000000E29F609B8    3808660663    3183754604    2    0000000DBAF910F0
4    3xs7qxkpb25r6    select esbflowno from esb2_trans_log where esbserviceflowno=:esbserviceflowno    1    2863732454    0000000E29F609B8    3808660663    3144792666    3    0000000DBB241668

  select * from TABLE(DBMS_XPLAN.DISPLAY_CURSOR('3xs7qxkpb25r6',2));
  
PLAN_TABLE_OUTPUT
SQL_ID  3xs7qxkpb25r6, child number 2
-------------------------------------
select esbflowno from esb2_trans_log where 
esbserviceflowno=:esbserviceflowno
 
Plan hash value: 3183754604
 
-------------------------------------------------------------------------------------------------------------
| Id  | Operation             | Name                | Rows  | Bytes | Cost (%CPU)| Time     | Pstart| Pstop |
-------------------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT      |                     |       |       |   610K(100)|          |       |       |
|   1 |  PARTITION RANGE ALL  |                     |  1464K|    65M|   610K  (1)| 02:02:06 |     1 |     9 |
|*  2 |   INDEX FAST FULL SCAN| IDX1_ESB2_TRANS_LOG |  1464K|    65M|   610K  (1)| 02:02:06 |     1 |     9 |
-------------------------------------------------------------------------------------------------------------
 
Predicate Information (identified by operation id):
---------------------------------------------------
 
   2 - filter(SYS_OP_C2C("ESBSERVICEFLOWNO")=:ESBSERVICEFLOWNO)
 
类型为<type 'unicode'>，此时走的是index fast full scan



b.
20.5.101.31_/root>cat testesb.py 
import cx_Oracle
#esbserviceflowno=req.GET['flowno'].encode('raw_unicode_escape')
esbserviceflowno=u'10102020180920010158019945'
esbserviceflowno=esbserviceflowno.encode('raw_unicode_escape')
print type(esbserviceflowno);
dbuser='esbdata'
dbpass='esbdata'
dbip='1.1.1.1'
dbservice='esbdb'
conn = cx_Oracle.connect(dbuser,dbpass,dbip+'/'+dbservice)
cursor = conn.cursor()
cursor.prepare("""select esbflowno from esb2_trans_log where esbserviceflowno=:esbserviceflowno""" ) 
cursor.execute(None,{'esbserviceflowno':esbserviceflowno})

d={}
info = cursor.fetchall()
print info
20.5.101.31_/root>python testesb.py 
<type 'str'>
[('esbapp1-esb_in-20180920083825-542762',), ('esbapp1-esb_in-20180920083825-542776',), ('esbapp4-esb_in-20180920083824-540272',), ('esbapp3-esb_in-20180920083830-541070',), ('esbapp2-esb_in-20180920083830-545483',)]
20.5.101.31_/root>

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='3xs7qxkpb25r6';
 
SQL_ID        3xs7qxkpb25r6
SQL_TEXT    select esbflowno from esb2_trans_log where esbserviceflowno=:esbserviceflowno
VERSION_COUNT    4
LOADS            6
HASH_VALUE    2863732454
ADDRESS    0000000E29F609B8
PLAN_HASH_VALUE    3144792666
OLD_HASH_VALUE    3808660663
LAST_ACTIVE_CHILD_ADDRESS    0000000DBB241668


  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 = '3xs7qxkpb25r6';
  
         SQL_ID    SQL_TEXT    LOADED_VERSIONS    HASH_VALUE    ADDRESS    OLD_HASH_VALUE    PLAN_HASH_VALUE    CHILD_NUMBER    CHILD_ADDRESS
1    3xs7qxkpb25r6    select esbflowno from esb2_trans_log where esbserviceflowno=:esbserviceflowno    1    2863732454    0000000E29F609B8    3808660663    3183754604    0    0000000DF7455E30
2    3xs7qxkpb25r6    select esbflowno from esb2_trans_log where esbserviceflowno=:esbserviceflowno    1    2863732454    0000000E29F609B8    3808660663    3183754604    1    0000000DF26C6480
3    3xs7qxkpb25r6    select esbflowno from esb2_trans_log where esbserviceflowno=:esbserviceflowno    1    2863732454    0000000E29F609B8    3808660663    3183754604    2    0000000DBAF910F0
4    3xs7qxkpb25r6    select esbflowno from esb2_trans_log where esbserviceflowno=:esbserviceflowno    1    2863732454    0000000E29F609B8    3808660663    3144792666    3    0000000DBB241668

  select * from TABLE(DBMS_XPLAN.DISPLAY_CURSOR('3xs7qxkpb25r6',3));
  
  PLAN_TABLE_OUTPUT
SQL_ID  3xs7qxkpb25r6, child number 3
-------------------------------------
select esbflowno from esb2_trans_log where 
esbserviceflowno=:esbserviceflowno
 
Plan hash value: 3144792666
 
-----------------------------------------------------------------------------------------------------------
| Id  | Operation           | Name                | Rows  | Bytes | Cost (%CPU)| Time     | Pstart| Pstop |
-----------------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT    |                     |       |       |    28 (100)|          |       |       |
|   1 |  PARTITION RANGE ALL|                     |     1 |    47 |    28   (0)| 00:00:01 |     1 |     9 |
|*  2 |   INDEX RANGE SCAN  | IDX1_ESB2_TRANS_LOG |     1 |    47 |    28   (0)| 00:00:01 |     1 |     9 |
-----------------------------------------------------------------------------------------------------------
 
Predicate Information (identified by operation id):
---------------------------------------------------
 
   2 - access("ESBSERVICEFLOWNO"=:ESBSERVICEFLOWNO)
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原文地址：https://www.cnblogs.com/hzcya1995/p/13349054.html