add performance test for dropping of table

h2/src/test/org/h2/test/todo/TestDropTableLarge.java

+/*
+ * Copyright 2004-2011 H2 Group. Multiple-Licensed under the H2 License,
+ * Version 1.0, and under the Eclipse Public License, Version 1.0
+ * (http://h2database.com/html/license.html).
+ * Initial Developer: H2 Group
+ */
+package org.h2.test.todo;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.PreparedStatement;
+import java.sql.SQLException;
+import java.sql.Statement;
+import org.h2.tools.DeleteDbFiles;
+import org.h2.util.Profiler;
+
+/**
+ * Test the performance of dropping large tables
+ */
+public class TestDropTableLarge {
+
+    /**
+     * Run just this test.
+     *
+     * @param args ignored
+     */
+    public static void main(String... args) throws Exception {
+        // System.setProperty("h2.largeTransactions", "true");
+        TestDropTableLarge.test();
+    }
+
+    private static void test() throws SQLException {
+        DeleteDbFiles.execute("data", "test", true);
+        Connection conn = DriverManager.getConnection("jdbc:h2:data/test");
+        Statement stat = conn.createStatement();
+        stat.execute("create table test1(id identity, name varchar)");
+        stat.execute("create table test2(id identity, name varchar)");
+        conn.setAutoCommit(true);
+        // use two tables to make sure the data stored on disk is not too simple
+        PreparedStatement prep1 = conn.prepareStatement(
+                "insert into test1(name) values(space(255))");
+        PreparedStatement prep2 = conn.prepareStatement(
+                "insert into test2(name) values(space(255))");
+        for (int i = 0; i < 50000; i++) {
+            if (i % 7 != 0)
+                prep1.execute();
+            else
+                prep2.execute();
+        }
+        Profiler prof = new Profiler();
+        prof.startCollecting();
+        stat.execute("DROP TABLE test1");
+        prof.stopCollecting();
+        System.out.println(prof.getTop(3));
+        conn.close();
+    }
+
+}