RE: Is possible to return the SQL result but not query the table?
- From: "Brooks, Dominic (London)(c)" <dbrooks@xxxxxxxxxxxxxxxxxx>
- To: <kamusis@xxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Thu, 11 Mar 2010 09:19:09 -0000
What version of Oracle?
If 10gR2 onwards then you could maybe look at dbms_advanced_rewrite?
________________________________
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Leyi Zhang (Kamus)
Sent: 11 March 2010 03:50
To: oracle-l@xxxxxxxxxxxxx
Subject: Is possible to return the SQL result but not query the table?
Hi, gurus
In our application, there is a SQL we can't modify, can't remove:
SELECT 1 AS scope,
'ROWID' AS column_name,
-8 AS data_type,
'ROWID' AS type_name,
0 AS column_size,
0 AS buffer_length,
0 AS decimal_digits,
2 AS pseudo_column
FROM DUAL
WHERE :1 = 1
UNION
SELECT 2 AS scope,
t.column_name,
DECODE(t.data_type,
'CHAR',
1,
'VARCHAR2',
12,
'NUMBER',
3,
'LONG',
-1,
'DATE',
91,
'RAW',
-3,
'LONG RAW',
-4,
'TIMESTAMP(6)',
93,
'TIMESTAMP(6) WITH TIME ZONE',
-101,
'TIMESTAMP(6) WITH LOCAL TIME ZONE',
-102,
'INTERVAL YEAR(2) TO MONTH',
-103,
'INTERVAL DAY(2) TO SECOND(6)',
-104,
'BINARY_FLOAT',
100,
'BINARY_DOUBLE',
101,
1111) AS data_type,
t.data_type AS type_name,
DECODE(t.data_precision, null, t.data_length, t.data_precision)
AS column_size,
0 AS buffer_length,
t.data_scale AS decimal_digits,
1 AS pseudo_column
FROM all_tab_columns t, all_ind_columns i
WHERE :2 = 1
AND t.table_name = :3
AND t.owner like :4 escape '/'
AND t.nullable != :5
AND t.owner = i.table_owner
AND t.table_name = i.table_name
AND t.column_name = i.column_name
But this SQL always consume a lot CPU, a lot of Gets, always be the Top
1 SQL.
This SQL's result is not been used anymore, but I can't access the
program code, so my question is:
Can I do something in the database side, and tell the database when this
SQL runs, just return a static result, avoid to querying all_tab_columns
and all_ind_columns views?
--
Kamus <kamusis@xxxxxxxxx>
Oracle8i & 9i Certified DBA from China
Visit my blog for more article: http://www.dbform.com
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