Performance hit using "where" clause in the query

Hi All,
I am facing a huge performance hit in the java code when using "where" clause in queries. Following are the details:
1. SELECT * FROM Employee
2. SELECT * FROM Employee where employeeid in (26,200,330,571,618,945)
There is no difference in Query Execution Time for both queries.
Business Logic Time is huge in second case as compared to first one (ratio - 1:20).
Rows returned are more in first case as compared to second case.(ratio - 1:4)
Business Logic is same for both the cases where I iterate through the ResultSet, get the objects and set them in a data structure.
Does anybody know the reason of unexpected time difference for the business logic in the second case?

Since you're mentioning clustering your index, I'll assume you are using Oracle. Knowing what database you are using makes it a lot easier to suggest things.
Since you are using Oracle, you can get the database to tell you what execution plan it is using for each of the 2 SQL statements, and figure out why they have similar times (if they do).
First, you need to be able to run SQL*Plus; that comes as part of a standard database installation and as part of the Oracle client installation - getting it set up and running is outside the scope of this forum.
Second, you may need your DBA to enable autotracing, if it's not already:
http://asktom.oracle.com/~tkyte/article1/autotrace.html
http://www.samoratech.com/tips/swenableautotrace.htm
Once it's all set up, you can log in to your database using sql*plus, issue "SET AUTOTRACE ON", issue queries and get execution plan information back.
For example:
SQL> set autotrace on
SQL> select count(*) from it.ticket where ticket_number between 10 and 20;
COUNT(*)
        11
Execution Plan
Plan hash value: 2983758974
| Id | Operation         | Name       | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT |            |     1 |     4 |     1   (0)| 00:00:01 |
|   1 | SORT AGGREGATE   |            |     1 |     4 |            |          |
|* 2 |   INDEX RANGE SCAN| TICKET_N10 |    12 |    48 |     1   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   2 - access("TICKET_NUMBER">=10 AND "TICKET_NUMBER"<=20)
Statistics
          0 recursive calls
          0 db block gets
          1 consistent gets
          0 physical reads
          0 redo size
        515 bytes sent via SQL*Net to client
        469 bytes received via SQL*Net from client
          2 SQL*Net roundtrips to/from client
          0 sorts (memory)
          0 sorts (disk)
          1 rows processed
SQL> This tells me that this query used an INDEX RANGE SCAN on index TICKET_N1; the query can't do much better than that logically... In fact, the statistic "1 consistent gets" tells me that Oracle had to examine only one data block to get the answer, also can't do better than that. the statistic, "0 physical reads" tells me that the 1 data block used was already cached in Oracle's memory.
the above is from Oracle 10g; autotrace is available back to at least 8i, but they've been adding information to the output with each release.
If you have questions about sql_plus, check the forums at asktom.oracle.com or http://forums.oracle.com/forums/category.jspa?categoryID=18
since sql*plus is not a JDBC thing...
Oh, and sql*plus can also give you easier access to timing information, with "set timing on".

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I see. Now works. So it would be like doing "SELECT ITEM,CATEGORY,COUNTRY, FROM TABLE WHERE CATEGORY='toy' AND COUNTRY='US'"
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Using "in" clause in the query in Database control

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You may build the comma-separated list in Java and use " {sql: ...} " in your query: http://e-docs.bea.com/workshop/docs81/doc/en/workshop/java-class/com/bea/control/DatabaseControl.html (sorry, I can't find the documentation for WLI 9.2).

Creating a where clause in the LOV query box

Hi guys is any able to help me with this one
i have a page in my app where there is a LOV drop down now the values for this drop down comes from a table that looks like this
users_for _form_TBL
E_MAIL
Vendor
[email protected]
oracle
[email protected]
sap
[email protected]
IBM
[email protected]
Oracle
[email protected]
intergraph
So my syntax for the LOV i mentioned looks like this
select VENDOR as display_value, VENDOR as return_value
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order by 1 ;
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What i did after this was add a select in the where clause of the LOV so that it would check in the insert table if that vendor had been chosen before and not display it again to be selected my syntax the second time around in the SQL query box was
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Hay man thanks for that info on the Tom Kyte Blog
--(the code you gave me )
select
    u.vendor display_value
, u.vendor return_value
from
    users_for_form_tbl u
where
    u.e_mail = :app_user
and not exists (select null from inserted_tbl_imp i where u.vendor = i.vendor)
order by
    u.vendor
--(After the error i tried )Then when i got the error i try'd using 'or exists' like this
--(code)
where
    u.e_mail = :app_user
and not exists (select null from inserted_tbl_imp i where u.vendor = i.vendor)
                      or exists (select null from inserted_tbl_imp i where u.vendor = i.vendor)
order by
    u.vendor
But the all the vendors that where in the same in the insert table came up in the drop down list example is oracle was assessed before then only oracle would appear in the drop down list and if it was assessed 3 times it would come up 3 times
--Then i tried to select where 'Assessed' is null   ('Assessed' is a column in the insert table which i created a trigger on to insert 1 in the 'ASSESSED' column when a vendor is begin assessed )
--(code)
where
    u.e_mail = :app_user
and not exists (select 'ASSESSED' from inserted_tbl_imp i where 'ASSESSED' is null )
order by
    u.vendor
This try didnt return any vendors at all
--Then i tried distinct
--(code)
where
    u.e_mail = :app_user
and not exists (select distinct 'VENDOR', from inserted_tbl_imp i where u.vendor = i.vendor)
order by
    u.vendor
This gave me a LOV ERROR
This is what i have tried so far there where others syntax's i tried last night as well but most of them came back as errors . Thanks again for you time and help fac586

How to Get the required List Item values by using Where Clause

I have two tables named "TAX_RULES","BILL"
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<CODE>
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END;
</CODE>

In the Tax Rules table, you state:
"Sub_Head_Code" field is unique
In the Bill table, you state:
Sub_Head_Code and Tax_ID are behaving like composite foreign key from Tax_Rules table
If the Sub_Head_Code is unique, then it's acting as a primary key, so Sub_Head_Code and Tax_ID in the Bill table are not behaving like a composite foreign key. The Sub_Head_Code is a foreign key, and the Tax_ID is irrelevant as far as keys are concerned.
It is not clear what it is you want to do.
If you want to display the Tax_IDs from the Bill table when you select a Sub_Head_Code from the Tax_Rules table, then change your query to:
select TAX_ID, TAX_ID from BILL where Sub_Head_Code = :Tax_Rules.Sub_Head_Code
If you want to display the Tax_IDs from the Tax_Rules table when you select a Sub_Head_Code from the Bill table, then change your query to:
select TAX_ID, TAX_ID from TAX_RULES where Sub_Head_Code = :Bill.Sub_Head_Code
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"I want that whenever i select a "Sub_Head_Code", Only that Tax_ID which is associated with that Sub_Head_Code"
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How do you use 3 Where Clauses in a query

Hi, i am trying to figure out how to use 3 Where Clauses in a Query where 2 of the Where Clauses uses a Sub query.
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Query using where clause

I am not able to run a SQL query using where clause.
the query is as follows:
I extract the text input by the user in a text field say 'a' and
store it in string 'y'.
String y= a.getText();
//running the query
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how do we run a where clause when y is a string variable instead of value?

Use the following :
String y = a.getText();
String query ="select A.CODE from Port A where A.NAME=" + "'" + y + "'" ;
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Regarding dynamically assigning the where clause to select query

hi,
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Using where clause with like

Hi all,
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Regards,
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Hi,
does this work ?
set_block_property( 'customer_settlement' , default_where ,
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Frank

Can we use where clause in Update on Merge statement?

Hi All,
I tried to execute the following Merge Query:
When this query is executed without ‘Where clause’ in Update statement its working fine. When executed with ‘Where clause’ it throwing the following error:
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MERGE INTO TABLE_NAME
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INSERT
INSERT VALUES;
Can some one help on this?
Thanks in advance.
Darius

Yes:
SQL> drop table emp1;
Table dropped.
SQL> create table emp1 as select * from emp where deptno = 30;
Table created.
SQL> update emp1 set sal = sal*2;
6 rows updated.
SQL> commit;
Commit complete.
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ALLEN            3200
WARD             2500
MARTIN           2500
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TURNER           3000
JAMES            1900
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SQL> MERGE INTO emp1
2 USING(select * from emp) emp
3 ON (emp1.empno = emp.empno)
4 WHEN MATCHED THEN
5 UPDATE SET sal = emp.sal WHERE ename = 'TURNER'
6 WHEN NOT MATCHED THEN
7 INSERT(ename,sal) VALUES(emp.ename,emp.sal);
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SQL> select ename,sal from emp1;
ENAME             SAL
ALLEN            3200
WARD             2500
MARTIN           2500
BLAKE            5700
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JAMES            1900
SMITH             800
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How can I pass multiple condition in where clause with the join table?

Hi:
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Thanks in advance for any help.
Regards,
TD

If you are using SQL-Plus or Reports you can use lexical parameters like:
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SELECT &columns FROM &tables &condition;
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Best of luck!

How to use WHERE Clause in BPEL

Hi ,
i am trying to use where clause in DB adapter but its not working.
my query is "select empname from employee where empid = &a"
can any body tell me what is the reason its npt working?
and how can i retrive data form DB?

Hi,
You are thinking perfectly fine. The solution what I suggested was
select ename from emp where empno=?
And the solution provided by you was
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I just want to say that if you see closely, internal logic changes #parameter name to ?. So both the logics are right.
Cheers,
Abhi...

Where Clause in the Forms doesn't work

Hi,
I am trying to execute a query in base table block. The block property 'Query allowed' is TRUE and WHere clause is null;
I used 'SET_BLOCK_PROPERTY' and set the where clause. Did a GO_BLOCK and EXECUTE_QUERY;
The block brings all records as if there is no where clause. TO make sure I put up a message 'GET_BLOCK_PROPERTY' to see the where clause. It showed correct where clause.
null

Setting the where clause the way you did usually works, and it worked fine for me several times.
Yet, a couple of days ago I ran into something that defies my logic:
1) when using the "=" operator, it fetched me several records that satisfied the condition
2) when using the "<=" or ">=" operator it fetched only one of the records that satisfied the condition: the one that is strictly equal.
I tried using the pre-query trigger, but to no avail.
I'm looking forward for your succes.
null

How to set Where clause in the View Object of the MessageChoice ?

Hi,
How to set Where clause in the View Object of the
MessageChoice ?
Example:
<bc4j:rootAppModuleDef name="EdEscolaCampusView1AppModule"
definition="ed00050.Ed00050Module"
releaseMode="stateful" >
<bc4j:viewObjectDef name="EdEscolaCampusView1" >
<bc4j:rowDef name="CreateEdEscolaCampusView1" autoCreate="true" >
<bc4j:propertyKey name="key" />
</bc4j:rowDef>
</bc4j:viewObjectDef>
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</bc4j:registryDef>
messageChoice declaration:
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<contents>
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textAttrName="NomTipoBasico"
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</bc4j:messageChoice>
I would like set where clause of ViewObject, with dinamic parameters (using attribute1 = :1), before populate messageChoice.
thanks...
Danilo

Hi Andy,
I try set a where clause using the message:
Set where Clause parameter using UIX , but my UIX Page have 2 messageChoice's of different ViewObject's, then I need implement this Java Class:
//Nome da Package da Tela Detail
package br.com.siadem.siaed.ed00050;
// Importa as Bibliotecas necessárias
import oracle.jbo.ViewObject;
import oracle.jbo.ApplicationModule;
import oracle.jbo.client.Configuration;
import oracle.cabo.servlet.BajaContext;
import oracle.cabo.servlet.Page;
import oracle.cabo.servlet.event.PageEvent;
import oracle.cabo.servlet.event.EventResult;
import oracle.cabo.data.jbo.servlet.bind.*;
import oracle.cabo.ui.data.BoundValue;
import oracle.cabo.ui.data.DataBoundValue;
import javax.servlet.http.HttpServletRequest;
import br.com.siadem.siaed.util.*;
import javax.servlet.http.Cookie;
import oracle.cabo.data.jbo.def.NestedAppModuleDef;
import oracle.cabo.data.jbo.def.ViewObjectDef;
import oracle.cabo.data.jbo.def.AppModuleDef;
// Classe que configura os parametros para a execução da Query,
// utilizando variáveis de Sessao
public class FunPreQueryLista
public static EventResult FunConfiguraQuery(BajaContext context, Page page, PageEvent event) throws Throwable
// TrataDadosSessao - Classe utilizada para retornar os valores das variáveis de sessão genéricas
// Ex: CodCliente, CodMunicipio etc...
TrataDadosSessao varDadosSessao = new TrataDadosSessao();
// 1o. Parametro Configurado - Através da classe TrataDadosSessao, utilizando um método Get
// <alterar>
String valor1 = varDadosSessao.getCodCliente();
String valor2 = varDadosSessao.getCodMunicipio();
//Cria o objeto que retorna o ApplicationModule
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//Cria o objeto que retorna o view object da lista desejada
//alterar
ViewObject TipoLocal = am.findViewObject("ListaTipoLocalView1");
//Configuração dos parametros definidos na query do view Object
//alterar
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// Executa a Query
TipoLocal.executeQuery();
// Fim das Configurações da Query da Lista
// Início das Configurações da Query da Lista
//Cria o objeto que retorna o view object da lista desejada
//alterar
ViewObject TipoDestLixo = am.findViewObject("ListaDestinoLixoView1");
//Configuração dos parametros definidos na query do view Object
//alterar
TipoDestLixo.setWhereClauseParam(0,valor1);
TipoDestLixo.setWhereClauseParam(1,valor2);
// Executa a Query
TipoDestLixo.executeQuery();
// Fim das Configurações da Query da Lista
// Retorna o Resultado para a Página
return new EventResult(page);
The code works very well...
And, I'm sorry for my two repost's in UIX Forum about this in a few time.
Thank very much...
Danilo

How to use where clause with get statement in LDB programs

Hi All,
I am using logical databse in my report program.I am not getting how to use the where clause in the get statement is it possible to use?or if not possible only option is we should filter it after get statment is right?Can you please some body throw some idea on this?
Regards
Mahesh

Hi,
Reffer these links
http://help.sap.com/saphelp_nw04/helpdata/en/9f/db9bfa35c111d1829f0000e829fbfe/content.htm
http://help.sap.com/saphelp_nw04/helpdata/en/9f/db9b5e35c111d1829f0000e829fbfe/frameset.htm
http://help.sap.com/saphelp_nw04/helpdata/en/c6/8a15381b80436ce10000009b38f8cf/frameset.htm
/people/srivijaya.gutala/blog/2007/03/05/why-not-logical-databases
reward if helpful
Thanks,
Suma.

Performance hit using "where" clause in the query

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