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POHow to improve the select query performance in Java?
 

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  1. POHow to improve the select query performance in Java?
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    <p>I am using BerkeleyDB Database and I am performing <code>select</code> query that require 409 ms. How to improve the select query performance?</p> <p>I am using the following code:</p> <pre><code>import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.Statement; public class ReadData { Connection con=null; ResultSet rs=null; Statement smt = null; public void readData() { try { Class.forName("SQLite.JDBCDriver"); con = DriverManager.getConnection("jdbc:sqlite:/D:\\DB\\Mediation.db"); smt = con.createStatement(); long startTime = System.currentTimeMillis(); rs = smt.executeQuery("select * from CDRData"); while(rs.next()) { System.out.println(rs.getString(1)+" , "+rs.getString(2)+" , "+rs.getString(3)+" , "+rs.getString(4)+" , "+rs.getString(5)+" , "+rs.getString(6)+" , "+rs.getString(7)+" , "+rs.getString(8)+" , "+rs.getString(9)+" , "+rs.getString(10)+" , "+rs.getString(11)+" , "+rs.getString(12)+" , "+rs.getString(13)+" , "+rs.getString(14)+" , "+rs.getString(15)+" , "+rs.getString(16)+" , "+rs.getString(17)+" , "+rs.getString(18)+" , "+rs.getString(19)+" , "+rs.getString(20)+" , "+rs.getString(21)+" , "+rs.getString(22)+" , "+rs.getString(23)); } long finishTime = System.currentTimeMillis(); System.out.println("The time taken by select query : "+(finishTime-startTime)+ " ms"); } catch(Exception e) { System.out.println("Error ---- "+e); } } public static void main(String[] args) { ReadData csvread = new ReadData(); csvread.readData(); } } </code></pre>
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    1. PTQuestion
    1. USAndrew Thompson
    1. USDhananjay Joshi
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    1. COYou are trying to get better performance out of `select * from CDRData`?
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      1. POHow to improve the select query performance in Java?
      1. USBala R
    2. COThis is the time to perform the query and parse the ResultSet. You are also doing a select * which will scan the whole table. What kind of performance are you hoping for?
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      1. POHow to improve the select query performance in Java?
      1. USSean
    3. COYou might also want to skip the printing of the results. It is possible that printing the results is creating part of the delay.
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      1. POHow to improve the select query performance in Java?
      1. USPaul W
 

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