Performance problem JSP/JSTL/DB

Question

Hello,
I have the following code in my jsp page:
     <sql:query var="rs" dataSource="jdbc/TestDB">
          SELECT id, t, d, c, desc, cd, isActive, ct
          FROM ram
          ORDER BY i DESC;
     </sql:query>
     <pg:paging pageSize="50" indexSize="10">
          <c:forEach var="row" items="${rs.rows}" varStatus = "status">
               <c:if test="${row.isActive=='5234526723175'}" >
                    <pg:item>
                         // here goes some HTML code where I embed the following:                    
                         ${row.c}
                         ${row.t}
                         ${row.d}
                         ${row.cd}
                         ${row.desc}
                         ${row.id}
                    </pg:item>
               </c:if>
          </c:forEach>
          <pg:index>
                <pg:t> </pg:t>
                <pg:page>
                    <%=thisPage%>
                </pg:page>
                <pg:nextPages>Next</pg:nextPages>
                <pg:prevPages>Back</pg:prevPages>
          </pg:index>
     </pg:paging>                     When SELECT returns a resultSet with 10 000 entries (I loaded the DB with some dummy data) the performace goes down.
     For instance to load this page with 10 000 records takes up to 7 seconds.
Here is the table definition:     
CREATE TABLE ir
     id MEDIUMINT NOT NULL AUTO_INCREMENT,
     t varchar(100),
     d varchar(40),
     c int,
     desc varchar(2000),
     cd varchar(20),
     dateForCleanUp varchar(20),
     email varchar(40),
     isActive int,
     randomIntegerForDeletion int,
        ct int,
     PRIMARY KEY (id)
);What can be done to improve performance?
I tried alter the table and created index on id but it did not help.
Thanks

Answer 1

Hello,
I have the following code in my jsp page:
     <sql:query var="rs" dataSource="jdbc/TestDB">
          SELECT id, t, d, c, desc, cd, isActive, ct
          FROM ram
          ORDER BY i DESC;
     </sql:query>
     <pg:paging pageSize="50" indexSize="10">
<c:forEach var="row" items="${rs.rows}" varStatus =
= "status">
               <c:if test="${row.isActive=='5234526723175'}" >
                    <pg:item>
// here goes some HTML code where I embed the
d the following:                    
                         ${row.c}
                         ${row.t}
                         ${row.d}
                         ${row.cd}
                         ${row.desc}
                         ${row.id}
                    </pg:item>
               </c:if>
          </c:forEach>
          <pg:index>
                <pg:t> </pg:t>
                <pg:page>
                    <%=thisPage%>
                </pg:page>
                <pg:nextPages>Next</pg:nextPages>
                <pg:prevPages>Back</pg:prevPages>
          </pg:index>
     </pg:paging>                When SELECT returns a resultSet with 10 000 entries
s (I loaded the DB with some dummy data) the
performace goes down.
For instance to load this page with 10 000 records
s takes up to 7 seconds.
Here is the table definition:     
CREATE TABLE ir
     id MEDIUMINT NOT NULL AUTO_INCREMENT,
     t varchar(100),
     d varchar(40),
     c int,
     desc varchar(2000),
     cd varchar(20),
     dateForCleanUp varchar(20),
     email varchar(40),
     isActive int,
     randomIntegerForDeletion int,
     ct int,
     PRIMARY KEY (id)
);What can be done to improve performance?
I tried alter the table and created index on id but
it did not help.
Thanksa) look at gmail it retrives more inf but displays only some so as to increase scalabilty
so for your pblm
use multi threaded environment
modify the query
by giving RowNum rn rn =10
so it displays only 10 results
rownum is psedo column givs the number of rows to be retrivued
so it increses scalabilty