Selecting same column twice makes query slow

Hello,
Has anybody any idea why following statement is slow when selecting the
DATA_TYPE column twice?
SELECT S.OWNER,
S.SYNONYM_NAME,
UCOL.COLUMN_NAME,
UCOL.DATA_TYPE,
UCOL.DATA_TYPE,
UCOL.DATA_LENGTH,
COLUMN_ID
FROM ALL_SYNONYMS S,
ALL_TAB_COLUMNS UCOL
WHERE S.TABLE_OWNER = UCOL.OWNER
AND S.TABLE_NAME = UCOL.TABLE_NAME
and S.owner = 'REPORTING_TEST'
and S.SYNONYM_NAME = 'OV_COMMERCIAL_ENTITY_JN'
Replace the owner and table name with one of your own.
If you take one of the DATA_TYPE's out the select is much faster.
Why, I hear you ask, do you select the same column twice?
Well, it's not me. It's BusinessObjects when it does a structure refresh it
produces a statement similar to the one above except that one of the
DATA_TYPE's is a SUBSTR + DECODE (however they in themselves
have virtually no impact on the statement). I just find it weird that repeating
a column twice can have such a dramatic impact on performance.
I'm not a tuning expert and have looked at EXPLAIN PLAN outputs but can't
make head nor tail of them.
Thanks,
Ruud

Yes it's true that Oracle caches data but I did run both statements several times within the same session. Run statement 1, run statement 2, add 2nd column and run again, take column away and run again, etc. Always the results were the same. The query with duplicate columns ran in seconds, the one without in milliseconds.
If it tells you anything, below both explain plans. The main difference that I noticed is the full table scan on USER$ for the first query. The second one (although a more elaborate execution plan) seems to use indexes more.
Don't spend too much time on this. I've found a workaround where I create temporary tables for ALL_SYNONYMS and ALL_TAB_COLUMNS and re-direct the public synonyms to point at those. After I've done what I wanted to do with BusinessObjects, I restore the original public synonyms. Next thing I'll try is rebuilding my database from scratch and see if the problem is still there.
Apologies if the listings come out in variable font (how do you paste fixed font?).
=== SQL1 ====================================================
EXPLAIN PLAN FOR
SELECT UCOL.COLUMN_NAME,
UCOL.DATA_TYPE,
UCOL.DATA_TYPE
FROM ALL_SYNONYMS S,
ALL_TAB_COLUMNS UCOL
WHERE S.TABLE_OWNER = UCOL.OWNER
AND S.TABLE_NAME = UCOL.TABLE_NAME
AND S.owner = 'REPORTING_TEST'
AND S.SYNONYM_NAME = 'OV_COMMERCIAL_ENTITY_JN'
Explained.
Elapsed: 00:00:00.04
SQL> @E:\Oracle\Product\10.2.0\db_1\RDBMS\ADMIN\utlxpls.sql
Plan hash value: 1692851197
| Id | Operation | Name |
| 0 | SELECT STATEMENT | |
| 1 | NESTED LOOPS | |
| 2 | NESTED LOOPS | |
| 3 | NESTED LOOPS | |
| 4 | TABLE ACCESS BY INDEX ROWID | USER$ |
|* 5 | INDEX UNIQUE SCAN | I_USER1 |
| 6 | VIEW | ALL_TAB_COLUMNS |
|* 7 | FILTER | |
| 8 | NESTED LOOPS OUTER | |
| 9 | NESTED LOOPS OUTER | |
| 10 | NESTED LOOPS OUTER | |
| 11 | NESTED LOOPS OUTER | |
| 12 | NESTED LOOPS | |
| 13 | NESTED LOOPS | |
| 14 | TABLE ACCESS FULL | USER$ |
| 15 | TABLE ACCESS BY INDEX ROWID| OBJ$ |
|* 16 | INDEX RANGE SCAN | I_OBJ2 |
|* 17 | TABLE ACCESS CLUSTER | COL$ |
|* 18 | INDEX UNIQUE SCAN | I_OBJ# |
|* 19 | TABLE ACCESS CLUSTER | COLTYPE$ |
|* 20 | INDEX RANGE SCAN | I_HH_OBJ#_INTCOL# |
|* 21 | TABLE ACCESS BY INDEX ROWID | OBJ$ |
|* 22 | INDEX RANGE SCAN | I_OBJ3 |
| 23 | TABLE ACCESS CLUSTER | USER$ |
|* 24 | INDEX UNIQUE SCAN | I_USER# |
|* 25 | TABLE ACCESS CLUSTER | TAB$ |
|* 26 | INDEX UNIQUE SCAN | I_OBJ# |
| 27 | NESTED LOOPS | |
| 28 | FIXED TABLE FULL | X$KZSRO |
|* 29 | INDEX RANGE SCAN | I_OBJAUTH2 |
|* 30 | FIXED TABLE FULL | X$KZSPR |
|* 31 | TABLE ACCESS BY INDEX ROWID | OBJ$ |
|* 32 | INDEX RANGE SCAN | I_OBJ2 |
|* 33 | TABLE ACCESS BY INDEX ROWID | SYN$ |
|* 34 | INDEX UNIQUE SCAN | I_SYN1 |
Predicate Information (identified by operation id):
5 - access("U"."NAME"='REPORTING_TEST')
7 - filter(("O"."TYPE#"=3 OR "O"."TYPE#"=4 OR "O"."TYPE#"=2 AND NOT
EXISTS (SELECT 0 FROM "SYS"."TAB$" "T" WHERE "T"."OBJ#"=:B1 AND
(BITAND("T"."PROPERTY",512)=512 OR BITAND("T"."PROPERTY",8192)=8192)))
AND ("O"."OWNER#"=USERENV('SCHEMAID') OR EXISTS (SELECT 0 FROM
"SYS"."OBJAUTH$" "OBJAUTH$",SYS."X$KZSRO" "X$KZSRO" WHERE "OBJ#"=:B2
AND "GRANTEE#"="KZSROROL") OR EXISTS (SELECT 0 FROM SYS."X$KZSPR"
"X$KZSPR" WHERE "INST_ID"=USERENV('INSTANCE') AND ((-"KZSPRPRV")=(-45)
OR (-"KZSPRPRV")=(-47) OR (-"KZSPRPRV")=(-48) OR (-"KZSPRPRV")=(-49) OR
(-"KZSPRPRV")=(-50)))))
16 - access("O"."OWNER#"="U"."USER#")
17 - filter(DECODE("C"."PROPERTY",0,'NO',DECODE(BITAND("C"."PROPERTY",
32),32,'YES','NO'))='NO')
18 - access("O"."OBJ#"="C"."OBJ#")
19 - filter("C"."INTCOL#"="AC"."INTCOL#"(+))
20 - access("C"."OBJ#"="H"."OBJ#"(+) AND
"C"."INTCOL#"="H"."INTCOL#"(+))
21 - filter("OT"."TYPE#"(+)=13)
22 - access("AC"."TOID"="OT"."OID$"(+))
24 - access("OT"."OWNER#"="UT"."USER#"(+))
25 - filter(BITAND("T"."PROPERTY",512)=512 OR
BITAND("T"."PROPERTY",8192)=8192)
26 - access("T"."OBJ#"=:B1)
29 - access("GRANTEE#"="KZSROROL" AND "OBJ#"=:B1)
30 - filter("INST_ID"=USERENV('INSTANCE') AND ((-"KZSPRPRV")=(-45) OR
(-"KZSPRPRV")=(-47) OR (-"KZSPRPRV")=(-48) OR (-"KZSPRPRV")=(-49) OR
(-"KZSPRPRV")=(-50)))
31 - filter("O"."TYPE#"=5)
32 - access("O"."OWNER#"="U"."USER#" AND
"O"."NAME"='OV_COMMERCIAL_ENTITY_JN')
33 - filter("S"."NAME"="UCOL"."TABLE_NAME" AND
"S"."OWNER"="UCOL"."OWNER")
34 - access("O"."OBJ#"="S"."OBJ#")
Note
- rule based optimizer used (consider using cbo)
=== SQL2 ====================================================
EXPLAIN PLAN FOR
SELECT UCOL.COLUMN_NAME,
UCOL.DATA_TYPE
FROM ALL_SYNONYMS S,
ALL_TAB_COLUMNS UCOL
WHERE S.TABLE_OWNER = UCOL.OWNER
AND S.TABLE_NAME = UCOL.TABLE_NAME
AND S.owner = 'REPORTING_TEST'
AND S.SYNONYM_NAME = 'OV_COMMERCIAL_ENTITY_JN'
Explained.
SQL>
SQL> @E:\Oracle\Product\10.2.0\db_1\RDBMS\ADMIN\utlxpls.sql
Plan hash value: 3285788911
| Id | Operation | Name |
| 0 | SELECT STATEMENT | |
| 1 | TABLE ACCESS BY INDEX ROWID | OBJ$ |
|* 2 | INDEX UNIQUE SCAN | I_OBJ1 |
| 3 | TABLE ACCESS BY INDEX ROWID | OBJ$ |
|* 4 | INDEX UNIQUE SCAN | I_OBJ1 |
| 5 | TABLE ACCESS BY INDEX ROWID | OBJ$ |
|* 6 | INDEX UNIQUE SCAN | I_OBJ1 |
| 7 | TABLE ACCESS BY INDEX ROWID | OBJ$ |
|* 8 | INDEX UNIQUE SCAN | I_OBJ1 |
| 9 | TABLE ACCESS BY INDEX ROWID | OBJ$ |
|* 10 | INDEX UNIQUE SCAN | I_OBJ1 |
|* 11 | FILTER | |
| 12 | NESTED LOOPS OUTER | |
| 13 | NESTED LOOPS OUTER | |
| 14 | NESTED LOOPS OUTER | |
| 15 | NESTED LOOPS OUTER | |
| 16 | NESTED LOOPS | |
| 17 | NESTED LOOPS | |
| 18 | NESTED LOOPS | |
| 19 | NESTED LOOPS | |
| 20 | NESTED LOOPS | |
| 21 | TABLE ACCESS BY INDEX ROWID| USER$ |
|* 22 | INDEX UNIQUE SCAN | I_USER1 |
|* 23 | TABLE ACCESS BY INDEX ROWID| OBJ$ |
|* 24 | INDEX RANGE SCAN | I_OBJ2 |
| 25 | TABLE ACCESS BY INDEX ROWID | SYN$ |
|* 26 | INDEX UNIQUE SCAN | I_SYN1 |
| 27 | TABLE ACCESS BY INDEX ROWID | USER$ |
|* 28 | INDEX UNIQUE SCAN | I_USER1 |
| 29 | TABLE ACCESS BY INDEX ROWID | OBJ$ |
|* 30 | INDEX RANGE SCAN | I_OBJ2 |
|* 31 | TABLE ACCESS CLUSTER | COL$ |
|* 32 | INDEX UNIQUE SCAN | I_OBJ# |
|* 33 | TABLE ACCESS CLUSTER | COLTYPE$ |
|* 34 | INDEX RANGE SCAN | I_HH_OBJ#_INTCOL# |
|* 35 | TABLE ACCESS BY INDEX ROWID | OBJ$ |
|* 36 | INDEX RANGE SCAN | I_OBJ3 |
| 37 | TABLE ACCESS CLUSTER | USER$ |
|* 38 | INDEX UNIQUE SCAN | I_USER# |
|* 39 | TABLE ACCESS CLUSTER | TAB$ |
|* 40 | INDEX UNIQUE SCAN | I_OBJ# |
| 41 | NESTED LOOPS | |
| 42 | FIXED TABLE FULL | X$KZSRO |
|* 43 | INDEX RANGE SCAN | I_OBJAUTH2 |
|* 44 | FIXED TABLE FULL | X$KZSPR |
Predicate Information (identified by operation id):
2 - access("O"."OBJ#"=:B1)
4 - access("O"."OBJ#"=:B1)
6 - access("O"."OBJ#"=:B1)
8 - access("O"."OBJ#"=:B1)
10 - access("O"."OBJ#"=:B1)
11 - filter(("O"."TYPE#"=3 OR "O"."TYPE#"=4 OR "O"."TYPE#"=2 AND NOT
EXISTS (SELECT 0 FROM "SYS"."TAB$" "T" WHERE "T"."OBJ#"=:B1 AND
(BITAND("T"."PROPERTY",512)=512 OR BITAND("T"."PROPERTY",8192)=8192)))
AND ("O"."OWNER#"=USERENV('SCHEMAID') OR EXISTS (SELECT 0 FROM
"SYS"."OBJAUTH$" "OBJAUTH$",SYS."X$KZSRO" "X$KZSRO" WHERE "OBJ#"=:B2
AND "GRANTEE#"="KZSROROL") OR EXISTS (SELECT 0 FROM SYS."X$KZSPR"
"X$KZSPR" WHERE "INST_ID"=USERENV('INSTANCE') AND ((-"KZSPRPRV")=(-45)
OR (-"KZSPRPRV")=(-47) OR (-"KZSPRPRV")=(-48) OR (-"KZSPRPRV")=(-49) OR
(-"KZSPRPRV")=(-50)))))
22 - access("U"."NAME"='REPORTING_TEST')
23 - filter("O"."TYPE#"=5)
24 - access("O"."OWNER#"="U"."USER#" AND
"O"."NAME"='OV_COMMERCIAL_ENTITY_JN')
26 - access("O"."OBJ#"="S"."OBJ#")
28 - access("S"."OWNER"="U"."NAME")
30 - access("O"."OWNER#"="U"."USER#" AND "S"."NAME"="O"."NAME")
31 - filter(DECODE("C"."PROPERTY",0,'NO',DECODE(BITAND("C"."PROPERTY",
32),32,'YES','NO'))='NO')
32 - access("O"."OBJ#"="C"."OBJ#")
33 - filter("C"."INTCOL#"="AC"."INTCOL#"(+))
34 - access("C"."OBJ#"="H"."OBJ#"(+) AND
"C"."INTCOL#"="H"."INTCOL#"(+))
35 - filter("OT"."TYPE#"(+)=13)
36 - access("AC"."TOID"="OT"."OID$"(+))
38 - access("OT"."OWNER#"="UT"."USER#"(+))
39 - filter(BITAND("T"."PROPERTY",512)=512 OR
BITAND("T"."PROPERTY",8192)=8192)
40 - access("T"."OBJ#"=:B1)
43 - access("GRANTEE#"="KZSROROL" AND "OBJ#"=:B1)
44 - filter("INST_ID"=USERENV('INSTANCE') AND ((-"KZSPRPRV")=(-45) OR
(-"KZSPRPRV")=(-47) OR (-"KZSPRPRV")=(-48) OR (-"KZSPRPRV")=(-49) OR
(-"KZSPRPRV")=(-50)))
Note
- rule based optimizer used (consider using cbo)

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Stijn

Crystal Reports XI - How to pull same column value with different select...

I have a report with many (around 30) sub reports and it is giving serious performance issue. I am currently finding out a strategy to improve the performance. I see that most of the sub reports are taking same parameters from main report except for one parameter which is different for each sub report and hard coded in them and pulling up the same column value from a oracle database with a different select criterion. I am trying to find out a way using either of command/crystal formula/SQL expression which can do the same job for me and give me performance improvement. I tried to take the parameters from the main report in one sub report and mapped them to parameters being transferred to the command and then drag and drop the field for which I need to display the value but due to some reason it is not returning values when I am trying multiple commands...I need some help in selecting a strategy for this issue resolution and some guidance....Any help would be highly appreciated....

My version is 11.5.8.826. First of all I need to make it clear that I have 6 set of sub reports and each set has 5 sub reports. So if I can resolve the issue for one set, I resolve it for all. The sub reports are doing nothing but fetching a column value using a simple SQL SELECT query and appending to the right of a box in main report. The issue is that all these queries embedded into the sub reports are using same SQL except for one parameter in the "where" clause and they are fetching same column value from the database and fortunately all of them are returning same number of results. So at the end these results create a table when run. The only way I can stop using sub reports is by creating a table in the main report and use some object(formula/command/SQL expression or whatever) to fetch that column value using the same filter conditions. But please take a note that I need to use and append the same column value from a database table and use different filter conditions and append them to the right so that at the end they create a table...as long as I get the table in the output with a decent performance , anyone will be least bothered about what I used inside the report.....please ask me as many questions to get more lights on the issue....

Use same image column twice in a report

Hello,
I have a question which is, can I use a same image column (example column A) twice in a report? first occurrence (column A) will show the image thumbnail and the second occurrence (column A) will show image download link which opens image in a new window. Is it possible?
Thanks
Pravish

LA-APEX-DEv wrote:
Yes, it's possible. However, if you intent to have two different images, then I would suggest you use a javascript to link or download the blob.
What on Earth for? Why is JavaScript necessary to download two different images? Even if this were in any way true, the OP is clear that the displayed thumbnail and download link involve the same image.
To accomplish this task, you either use decode or create a union query.
No, all that should be necessary is to reference the image column twice in the report query projection, and apply a download format mask to one column and an image mask to the other. That the OP has apparently failed to do this probably indicates that they are unnecessarily complicating things.
For example:
select '<a href="javascript:downloadImg(' || image_id || ');"><img src="/i/download.gif"></a>' link_col
from table
where allow_view = 'Y'
union all
select '<img src="/i/folder.gif">' link_col
from table
where allow_view = 'N'
or
select decode(allow_view,'Y',
'<a href="javascript:downloadImg(' || image_id || ');"><img src="/i/download.gif"></a>',
'<img src="/i/folder.gif">') link_col
from table
What is downloadImg? it is not a standard APEX JavaScript API. It is therefore highly unlikely that this is of any use to the OP.

Selecting all columns from table in a model query

I have written a model query which joins 4 tables, applies some rules and returns updated rows by selecting 4 columns out of this. Currently it works fine because all 4 columns are from MODEL aliases. Now I need to select 16 more columns in the same query but none of these columns is added in MODEL aliases. When I tried selecting these columns I got oracle error ORA - 32614. Can someone please guide me to include these columns in the same model query?
I tried couple of options but no luck. Here are those options for ready reference:
1. I cannot nest existing model query into another select because there are no columns avaiable to join in output of current query to map with other records.
2. I cannot include all 16 columns in MODEL aliases because some of these columns are actually output of user defined functions.
I am using Oracle database version 11g Release 11.2.0.1.0.
Edited by: Anirudha Dhopate on Jan 23, 2011 5:43 PM

Thank you Avijit for your reply. There is a syntax error on the ON in this part of the statement which I don't know how to fix - I tried messing around with another INNER JOIN but am not confident that I'm doing the right thing:
SENAlertType.SENAlertTypeIDONClassMember.ClassMemberStudentID
Thanks for your help! I will need to do some more bedtime reading on joins.
Daniel

Query result shows the same data twice

Hello All,
I've created UDFs like Supplier Name, Supplier Address, and (Excise Details like)Supplier ECC No,
Supplier Range.
And I've created Query for Supplier Name and Supplier Address, and I assigned to FMS, Its working Correctly.
I've created Query for Supplier ECC No. the Query is,
SELECT T0.[ECCNo],T1.[CardName]
FROM CRD7 T0 INNER JOIN OCRD T1 ON T0.CardCode = T1.CardCode
WHERE T0.[ECCNo] Like '[%]'
I saved the Query, and assigned to FMS.
At this stage (i.e. Query for Supplier ECC No.) the above Query showing the same data twice.
Please suggest to rectify the problem.
Thanks,
Pratheeviraj

You can get rid of the duplicates by changing the query to
SELECT DISTINCT T0.ECCNo,T1.CardName
FROM CRD7 T0 INNER JOIN OCRD T1 ON T0.CardCode = T1.CardCode
WHERE T0.ECCNo Like '[%]'
But it is always worth understanding why you are getting multiple records to check that you are getting back what you want. I think you may be seeing this because CRD7 can have multiple records for a business partner - maybe one for each of 'pay-to' and 'ship-to' address?

Select the same attribute in a query more than once

Hi Experts,
My requirement is to select the same attribute in a query more than once.
How can I acheive this?
Expecting an early solution..
Pilliga

Hi,
Create a calculated attribute that just displays the "same attribute".
(Note: you will need to uniquely name this object).
For example, if you wish to display Emp Name twice in the same query, then create a calculated attribute called Emp Name2 and select it and Emp Name in your query and the same info will be displayed twice in your results set.
Cheers,
Tanish

How to implement 'Quick Select' column in a query result table?

Hi,
I have a requirement in OAF to design a search page with 'Quick select' column.
One of the column in the query result table should be a quick select.
Once user clicks on the quick select column, we have to navigate back to the previous page with the row value selected.
Can anyone help me in this.
Thanks.

Also refer the search exercise in the toolbox tutorials.
you can implement the quick search in the same way as update and delete buttons.
--Prasanna

MS SQL query slow using view column as criteria

HI,
I am experiencing a very frustrate problem. I have 2 tables, and create a view
to union these 2 tables, when do a select on this view using the column of the
view as criteria is took more 1 minutes, but the query runs fine in Qurey Analyzer.
Anybody has the same experience? is this the problem with jdbc?

I searched http://e-docs.bea.com/wls/docs70/index.html, also searched the documentation
for wls6.1, wls5.1. As you pointed I searched support site, they are all the customer
case, it's not formal documentation.
Joe Weinstein <[email protected]> wrote:
>
>
jen wrote:
Thanks. but I search on the table is fine (the same column). is thereany db setting
could be tuned? so the view is the problem? No, it's a client decision/issue. If you defined your tables to have
nvarchar columns
the jdbc driver's parameter values would be fine as-is.
I searched "useVarChars" on whole
site and can't find anything.Which site? This is a property of the weblogic.jdbc.mssqlserver4.Driver.
I just went to www.bea.com/support and entered useVarChars in the Ask
BEA
question panel and got hits...
Joe
Joe Weinstein <[email protected]> wrote:
Jen wrote:
Sorry it's my bad. I am testing on wls81, but the problems is on wls70,so they
are using different drivers.
You are the magic man. It worked on wls81 now. I am sure it will curethe problem
on wls70. Is there any documentation on this? Why it is not a problemon some
databse server? ThanksSure. The issue has to do with the MS client-DBMS protocol having evolved
from
an 8-bit (7-bit really) character representation. Now it has a newer
16-bit
way, to transfer NVARCHAR data. Java characters are all 16-bit, so
by default
a JDBC driver will send Java parameters over as NVARCHAR data. This
is
crucial
for Japanese data etc. However, once simple ASCII data is transformed
to an
NVARCHAR format, the DBMS can't directly compare it to varchar data,
or use it
in index searches. The DBMS has to convert the VARCHAR data to NVARCHAR,
but it
can't guarantee that the converted data will retain the same ordering
as the index,
so the DBMS has to do a table scan!
The properties I suggested are each driver's way of allowing you
to say "I'm
a simple American ;) I am using simple varchar data so please sendmy
java
strings that way.". This allows the DBMS to use your varchar indexes
in queries.
Joe Weinstein at BEA
Joe Weinstein <[email protected]> wrote:
Jen wrote:
It doesn't cure the problem. Here is my pool
<JDBCConnectionPool DriverName="weblogic.jdbc.sqlserver.SQLServerDriver"Name="test_pool"
Password="{3DES}fKSovViFe5kHzl/vTs0LVQ==" Properties="user=user;PortNumber=1543;useVarChars=true;ServerName=194.20.2.10;DatabaseName=devDB"
Targets="admin" TestTableName="SQL SELECT COUNT(*) FROM sysobjects"URL="jdbc:bea:sqlserver://194.20.2.10:1543"/>
Strange is some database is fine.Oh, sorry. I thought it was the older weblogic driver. Change the
useVarChars=true to sendStringParametersAsUnicode=false
Let me know... Also, I suggest changing the TestTableName to "SQL
select
1".
For MS, that will be much more efficient than involving a full count
of sysobjects!
Joe
Joe Weinstein <[email protected]> wrote:
Jen wrote:
You are right. Tadaa! Am I Kreskin, or what? ;) Here's what I recommend:
In your pool definition, for this driver add a driver property:
useVarChars=true
and let me know if it's all better.
Joe
I am using weblogic jdbc driver weblogic.jdbc.mssqlserver4.Driver.
here is the code:
getData(Connection connection, String stmt, ArrayList arguments)
PreparedStatement pStatement=null;>>>>>>>> ResultSet resultSet=null;>>>>>>>> try {>>>>>>>> pStatement = connection.prepareStatement(stmt);>>>>>>>> for (int i = 1; i <= arguments.size(); i++) {>>>>>>>> pStatement.setString(i, (String) arguments.get(i-1));>>>>>>>> resultSet = pStatement.executeQuery(); //this statement takesmore than 1
min.
Joe Weinstein <[email protected]> wrote:
Jen wrote:
HI,
I am experiencing a very frustrate problem. I have 2 tables,
and
create
a view
to union these 2 tables, when do a select on this view using
the
column
of the
view as criteria is took more 1 minutes, but the query runs
fine
in
Qurey Analyzer.
Anybody has the same experience? is this the problem with jdbc?
I have suspicions... Show me the jdbc code. I'm guessing it's
a
PreparedStatement,
and you send the search criterion column value as a parameter
you
set
with a
setString().... Let me know... (also let me know which jdbc driveryou're
using).
Joe

Selecting same column twice makes query slow

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