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oracle模糊查询（一）

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oracle模糊查询（一）

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oracle性能优化 2011-06-28 16:03
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oracle iphone table access filter

546@iquery@ALIDW>desciquery.lpx_kw_tmp00
Name Null? Type
------------------------------------------------------------------------------------------------------------- --------------------------------------------------------------------
KEYWORDS VARCHAR2(256)
COUNTRY_ID VARCHAR2(10)
COUNTRY_NAME VARCHAR2(256)
REGION_ID NUMBER
REGIN_NAME VARCHAR2(128)
PRE_REGIN_ID NUMBER
PRE_REGIN_ENAME VARCHAR2(128)
SRH_PV_THIS_5MON NUMBER

546@iquery@ALIDW>selectcount(1) from iquery.lpx_kw_tmp00;

COUNT(1)
----------
24600608

546@iquery@ALIDW>select* from iquery.lpx_kw_tmp00 where keywords = 'full iphone 4 kits';

KEYWORDS
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
COUNTRY_ID
----------
COUNTRY_NAME
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
REGION_ID REGIN_NAME PRE_REGIN_ID
------------------------------------------------------------------------------------------------------------------------------------------------------
PRE_REGIN_ENAME SRH_PV_THIS_5MON
------------------------------------------------------------------------------------------------------------------------------------------------
full iphone 4 kits
CN
China
7 Asia 2
Asia1

full iphone 4 kits
FR
France
17 Western Europe 5
Europe3

full iphone 4 kits
HK
Hong Kong
7 Asia 2
Asia2

Elapsed: 00:01:17.86

425@iquery@ALIDW>explain plan for select * fromiquery.lpx_kw_tmp00 where
keywords = 'full iphone 4 kits';

Explained.

Elapsed: 00:00:01.17
425@iquery@ALIDW>select* from table(dbms_xplan.display());

PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Plan hash value:4249314168

----------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
----------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 614 | 262K| 26312 (3)| 00:07:54 |
|* 1 | TABLE ACCESS FULL| LPX_KW_TMP00 | 614 | 262K| 26312 (3)| 00:07:54 |
----------------------------------------------------------------------------------

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

1 -filter(LOWER(TRIM("KEYWORDS"))='full iphone 4 kits')

Note
-----
- dynamic sampling used for this statement

17 rows selected.

--创建索引
546@iquery@ALIDW>CREATEINDEX iquery.lpx_kw_tmp00_ind ON iquery.lpx_kw_tmp00(keywords);

Index created.

Elapsed: 00:02:35.29

546@iquery@ALIDW>select* from iquery.lpx_kw_tmp00 where keywords = 'full iphone 4 kits';

KEYWORDS
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
COUNTRY_ID
----------
COUNTRY_NAME
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
REGION_ID REGIN_NAME PRE_REGIN_ID
------------------------------------------------------------------------------------------------------------------------------------------------------
PRE_REGIN_ENAME SRH_PV_THIS_5MON
------------------------------------------------------------------------------------------------------------------------------------------------
full iphone 4 kits
CN
China
7 Asia 2
Asia1

full iphone 4 kits
HK
Hong Kong
7 Asia 2
Asia2

full iphone 4 kits
FR
France
17 Western Europe 5
Europe3

Elapsed: 00:00:00.82

425@iquery@ALIDW>explainplan for select * from iquery.lpx_kw_tmp00 where keywords = 'full iphone 4kits';

Explained.

Elapsed: 00:00:00.81
425@iquery@ALIDW>select* from table(dbms_xplan.display());

PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Plan hash value:3550892647

------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 3 | 1314 | 6 (0)| 00:00:01 |
| 1 | TABLE ACCESS BY INDEX ROWID| LPX_KW_TMP00 | 3 | 1314 | 6 (0)| 00:00:01 |
|* 2 | INDEX RANGE SCAN |LPX_KW_TMP00_IND | 3 | | 3 (0)| 00:00:01 |
------------------------------------------------------------------------------------------------

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

2 - access("KEYWORDS"='full iphone4 kits')

Note
-----
- dynamic sampling used for this statement

18 rows selected.

Elapsed: 00:00:00.01

--like@str+%

425@iquery@ALIDW>select* from iquery.lpx_kw_tmp00 where keywords LIKE 'full iphone 4 kits%';

KEYWORDS
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
COUNTRY_ID
----------
COUNTRY_NAME
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
REGION_ID REGIN_NAME PRE_REGIN_ID
------------------------------------------------------------------------------------------------------------------------------------------------------
PRE_REGIN_ENAME SRH_PV_THIS_5MON
------------------------------------------------------------------------------------------------------------------------------------------------
full iphone 4 kits
CN
China
7 Asia 2
Asia1

full iphone 4 kits
HK
Hong Kong
7 Asia 2
Asia2

full iphone 4 kits
FR
France
17 Western Europe 5
Europe3

Elapsed: 00:00:01.01

425@iquery@ALIDW>explainplan for select * from iquery.lpx_kw_tmp00 where keywords LIKE 'full iphone 4kits%';

Explained.

Elapsed: 00:00:00.82
425@iquery@ALIDW>select* from table(dbms_xplan.display());

PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Plan hash value:3550892647

------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 3 | 1314 | 6 (0)| 00:00:01 |
| 1 | TABLE ACCESS BY INDEX ROWID| LPX_KW_TMP00 | 3 | 1314 | 6 (0)| 00:00:01 |
|* 2 | INDEX RANGE SCAN |LPX_KW_TMP00_IND | 3 | | 3 (0)| 00:00:01 |
------------------------------------------------------------------------------------------------

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

2 - access("KEYWORDS" LIKE 'fulliphone 4 kits%')
filter("KEYWORDS" LIKE 'fulliphone 4 kits%')

Note
-----
- dynamic sampling used for this statement

19 rows selected.

Elapsed: 00:00:00.01

--
--like%+@str

546@iquery@ALIDW>select* from iquery.lpx_kw_tmp00 where keywords LIKE '%full iphone 4 kits';

KEYWORDS
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
COUNTRY_ID
----------
COUNTRY_NAME
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
REGION_ID REGIN_NAME PRE_REGIN_ID
------------------------------------------------------------------------------------------------------------------------------------------------------
PRE_REGIN_ENAME SRH_PV_THIS_5MON
------------------------------------------------------------------------------------------------------------------------------------------------
full iphone 4 kits
CN
China
7 Asia 2
Asia1

full iphone 4 kits
FR
France
17 Western Europe 5
Europe3

shinning full iphone 4 kits
FR
France
17 Western Europe 5
Europe3

full iphone 4 kits
HK
Hong Kong
7 Asia 2
Asia2

shinning blue fulliphone 4 kits
FR
France
17 Western Europe 5
Europe1

shinning full iphone4 kits
FR
France
17 Western Europe 5
Europe1

purple full iphone 4kits
FR
France
17 Western Europe 5
Europe2

7 rows selected.

Elapsed: 00:01:04.91

425@iquery@ALIDW>explainplan for select * from iquery.lpx_kw_tmp00 where keywords LIKE '%full iphone 4kits';

Explained.

Elapsed: 00:00:00.02
425@iquery@ALIDW>select* from table(dbms_xplan.display());

PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Plan hash value:4249314168

----------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
----------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 614 | 262K| 26032 (2)| 00:07:49 |
|* 1 | TABLE ACCESS FULL| LPX_KW_TMP00 | 614 | 262K| 26032 (2)| 00:07:49 |
----------------------------------------------------------------------------------

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

1 - filter("KEYWORDS" LIKE '%fulliphone 4 kits')

Note
-----
- dynamic sampling used for this statement

17 rows selected.

Elapsed: 00:00:00.01

oracle模糊查询（一）

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