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https://issues.apache.org/jira/browse/DERBY-2148?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Stefan Cordes closed DERBY-2148.
--------------------------------
Resolution: Won't Fix
> Debugging Derby 10.2.1.6 applications with Eclipse 3.1.2 is 10 times slower
> than debugging 10.1.2.2 applications
> ----------------------------------------------------------------------------------------------------------------
>
> Key: DERBY-2148
> URL: https://issues.apache.org/jira/browse/DERBY-2148
> Project: Derby
> Issue Type: Sub-task
> Affects Versions: 10.2.1.6
> Environment: Windows XP, Eclipse 3.1.2 and 3.2.1, Derby 10.2.1.6 and
> 10.1.2.2, JDK 1.4.2_10
> Reporter: Stefan Cordes
> Priority: Minor
>
> When running an db-application with Derby 10.2 and eclipse 3.1.2 the CPU
> usage of the eclipse javaw consumes the major CPU power and so the
> application is slow.
> Workaround: Take Eclipse 3.2.1 (where Derby 10.2 "debugs" only 50% slower)
> The below code gives following results:
> Runing mode:
> Eclipse 3.1 with Derby 10.1: Inserts=8.000ms
> Eclipse 3.1 with Derby 10.2: Inserts=6.000ms
> Eclipse 3.2 with Derby 10.1: Inserts=6.000ms
> Eclipse 3.2 with Derby 10.2: Inserts=6.000ms
> (everything fine)
> BUT Debugging mode:
> Eclipse 3.1 with Derby 10.1: Inserts=20.000ms
> Eclipse 3.1 with Derby 10.2: Inserts=229.000ms (<<<<)
> Eclipse 3.2 with Derby 10.1: Inserts=20.000ms
> Eclipse 3.2 with Derby 10.2: Inserts=30.000ms
> Any known reason for that?
> {code}
> import java.io.File;
> import java.sql.Connection;
> import java.sql.DriverManager;
> import java.sql.Statement;
> import org.apache.derby.jdbc.EmbeddedDriver;
> /**
> * Test Speed on Derby Inserts
> *
> */
> public class SlowDerbyDebugTest {
> public static void main(String[] args) {
> try {
> deleteFiles(new File("DB4O4"));
> System.out.println("Classpath=" +
> System.getProperty("java.class.path"));
> DriverManager.registerDriver(new EmbeddedDriver());
> Connection tempConnection =
> DriverManager.getConnection("jdbc:derby:DB4O4;create=true");
> tempConnection.setAutoCommit(false);
> Statement tempStatement =
> tempConnection.createStatement();
> long tempStart = System.currentTimeMillis();
> tempStatement.executeUpdate("create table test (id
> bigint, value char(40), primary key(id))");
> long tempStop1 = System.currentTimeMillis();
> for (int i = 0; i < 1000; i++) {
> tempStatement.executeUpdate("insert into test
> values (" + i + ",'" + i + "')");
> }
> long tempStop2 = System.currentTimeMillis();
> tempConnection.commit();
> long tempStop3 = System.currentTimeMillis();
> System.out.println("Create Table=" + (tempStop1 -
> tempStart) + "ms Inserts=" + (tempStop2 - tempStop1) + "ms"
> + " commit=" + (tempStop3 - tempStop2)
> + "ms Total=" + (tempStop3 - tempStart) + "ms");
> tempConnection.close();
> } catch (Exception e) {
> e.printStackTrace();
> }
> }
> private static void deleteFiles(File tempDir) {
> String[] tempFileNames = tempDir.list();
> if (tempFileNames != null) {
> for (int i = 0; i < tempFileNames.length; i++) {
> File tempDbFile = new
> File(tempDir.getAbsolutePath() + "/" + tempFileNames[i]);
> if (tempDbFile.isDirectory()) {
> deleteFiles(tempDbFile);
> tempDbFile.delete();
> } else {
> if (!tempDbFile.delete()) {
> throw new
> RuntimeException("Cannot delete DB file '" + tempDbFile + "'.");
> }
> }
> }
> tempDir.delete();
> }
> }
> }
> {code}
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