Examples with Analyze org.h2.command.ddl.Analyze used on opensource projects

Example 11 with Analyze

use of org.h2.command.ddl.Analyze in project h2database by h2database.

the class TestMultiDimension method testPerformance2d.

private void testPerformance2d() throws SQLException {
    deleteDb("multiDimension");
    Connection conn;
    conn = getConnection("multiDimension");
    Statement stat = conn.createStatement();
    stat.execute("CREATE ALIAS MAP FOR \"" + getClass().getName() + ".interleave\"");
    stat.execute("CREATE TABLE TEST(X INT NOT NULL, Y INT NOT NULL, " + "XY BIGINT AS MAP(X, Y), DATA VARCHAR)");
    stat.execute("CREATE INDEX IDX_X ON TEST(X, Y)");
    stat.execute("CREATE INDEX IDX_XY ON TEST(XY)");
    PreparedStatement prep = conn.prepareStatement("INSERT INTO TEST(X, Y, DATA) VALUES(?, ?, ?)");
    // the MultiDimension tool is faster for 4225 (65^2) points
    // the more the bigger the difference
    int max = getSize(30, 65);
    long time = System.nanoTime();
    for (int x = 0; x < max; x++) {
        for (int y = 0; y < max; y++) {
            long t2 = System.nanoTime();
            if (t2 - time > TimeUnit.SECONDS.toNanos(1)) {
                int percent = (int) (100.0 * ((double) x * max + y) / ((double) max * max));
                trace(percent + "%");
                time = t2;
            }
            prep.setInt(1, x);
            prep.setInt(2, y);
            prep.setString(3, "Test data");
            prep.execute();
        }
    }
    stat.execute("ANALYZE SAMPLE_SIZE 10000");
    PreparedStatement prepRegular = conn.prepareStatement("SELECT * FROM TEST WHERE X BETWEEN ? AND ? " + "AND Y BETWEEN ? AND ? ORDER BY X, Y");
    MultiDimension multi = MultiDimension.getInstance();
    String sql = multi.generatePreparedQuery("TEST", "XY", new String[] { "X", "Y" });
    sql += " ORDER BY X, Y";
    PreparedStatement prepMulti = conn.prepareStatement(sql);
    long timeMulti = 0, timeRegular = 0;
    int timeMax = getSize(500, 2000);
    Random rand = new Random(1);
    while (timeMulti < timeMax) {
        int size = rand.nextInt(max / 10);
        int minX = rand.nextInt(max - size);
        int minY = rand.nextInt(max - size);
        int maxX = minX + size, maxY = minY + size;
        time = System.nanoTime();
        ResultSet rs1 = multi.getResult(prepMulti, new int[] { minX, minY }, new int[] { maxX, maxY });
        timeMulti += System.nanoTime() - time;
        time = System.nanoTime();
        prepRegular.setInt(1, minX);
        prepRegular.setInt(2, maxX);
        prepRegular.setInt(3, minY);
        prepRegular.setInt(4, maxY);
        ResultSet rs2 = prepRegular.executeQuery();
        timeRegular += System.nanoTime() - time;
        while (rs1.next()) {
            assertTrue(rs2.next());
            assertEquals(rs1.getInt(1), rs2.getInt(1));
            assertEquals(rs1.getInt(2), rs2.getInt(2));
        }
        assertFalse(rs2.next());
    }
    conn.close();
    deleteDb("multiDimension");
    trace("2d: regular: " + TimeUnit.NANOSECONDS.toMillis(timeRegular) + " MultiDimension: " + TimeUnit.NANOSECONDS.toMillis(timeMulti));
}

Example 12 with Analyze

use of org.h2.command.ddl.Analyze in project h2database by h2database.

the class TestMultiDimension method testPerformance3d.

private void testPerformance3d() throws SQLException {
    deleteDb("multiDimension");
    Connection conn;
    conn = getConnection("multiDimension");
    Statement stat = conn.createStatement();
    stat.execute("CREATE ALIAS MAP FOR \"" + getClass().getName() + ".interleave\"");
    stat.execute("CREATE TABLE TEST(X INT NOT NULL, " + "Y INT NOT NULL, Z INT NOT NULL, " + "XYZ BIGINT AS MAP(X, Y, Z), DATA VARCHAR)");
    stat.execute("CREATE INDEX IDX_X ON TEST(X, Y, Z)");
    stat.execute("CREATE INDEX IDX_XYZ ON TEST(XYZ)");
    PreparedStatement prep = conn.prepareStatement("INSERT INTO TEST(X, Y, Z, DATA) VALUES(?, ?, ?, ?)");
    // the MultiDimension tool is faster for 8000 (20^3) points
    // the more the bigger the difference
    int max = getSize(10, 20);
    long time = System.nanoTime();
    for (int x = 0; x < max; x++) {
        for (int y = 0; y < max; y++) {
            for (int z = 0; z < max; z++) {
                long t2 = System.nanoTime();
                if (t2 - time > TimeUnit.SECONDS.toNanos(1)) {
                    int percent = (int) (100.0 * ((double) x * max + y) / ((double) max * max));
                    trace(percent + "%");
                    time = t2;
                }
                prep.setInt(1, x);
                prep.setInt(2, y);
                prep.setInt(3, z);
                prep.setString(4, "Test data");
                prep.execute();
            }
        }
    }
    stat.execute("ANALYZE SAMPLE_SIZE 10000");
    PreparedStatement prepRegular = conn.prepareStatement("SELECT * FROM TEST WHERE X BETWEEN ? AND ? " + "AND Y BETWEEN ? AND ? AND Z BETWEEN ? AND ? ORDER BY X, Y, Z");
    MultiDimension multi = MultiDimension.getInstance();
    String sql = multi.generatePreparedQuery("TEST", "XYZ", new String[] { "X", "Y", "Z" });
    sql += " ORDER BY X, Y, Z";
    PreparedStatement prepMulti = conn.prepareStatement(sql);
    long timeMulti = 0, timeRegular = 0;
    int timeMax = getSize(500, 2000);
    Random rand = new Random(1);
    while (timeMulti < timeMax) {
        int size = rand.nextInt(max / 10);
        int minX = rand.nextInt(max - size);
        int minY = rand.nextInt(max - size);
        int minZ = rand.nextInt(max - size);
        int maxX = minX + size, maxY = minY + size, maxZ = minZ + size;
        time = System.nanoTime();
        ResultSet rs1 = multi.getResult(prepMulti, new int[] { minX, minY, minZ }, new int[] { maxX, maxY, maxZ });
        timeMulti += System.nanoTime() - time;
        time = System.nanoTime();
        prepRegular.setInt(1, minX);
        prepRegular.setInt(2, maxX);
        prepRegular.setInt(3, minY);
        prepRegular.setInt(4, maxY);
        prepRegular.setInt(5, minZ);
        prepRegular.setInt(6, maxZ);
        ResultSet rs2 = prepRegular.executeQuery();
        timeRegular += System.nanoTime() - time;
        while (rs1.next()) {
            assertTrue(rs2.next());
            assertEquals(rs1.getInt(1), rs2.getInt(1));
            assertEquals(rs1.getInt(2), rs2.getInt(2));
        }
        assertFalse(rs2.next());
    }
    conn.close();
    deleteDb("multiDimension");
    trace("3d: regular: " + TimeUnit.NANOSECONDS.toMillis(timeRegular) + " MultiDimension: " + TimeUnit.NANOSECONDS.toMillis(timeMulti));
}

Example 13 with Analyze

use of org.h2.command.ddl.Analyze in project h2database by h2database.

the class TestMultiThread method testConcurrentAnalyze.

private void testConcurrentAnalyze() throws Exception {
    if (config.mvcc) {
        return;
    }
    deleteDb(getTestName());
    final String url = getURL("concurrentAnalyze;MULTI_THREADED=1", true);
    try (Connection conn = getConnection(url)) {
        Statement stat = conn.createStatement();
        stat.execute("create table test(id bigint primary key) " + "as select x from system_range(1, 1000)");
        Task t = new Task() {

            @Override
            public void call() throws SQLException {
                try (Connection conn2 = getConnection(url)) {
                    for (int i = 0; i < 1000; i++) {
                        conn2.createStatement().execute("analyze");
                    }
                }
            }
        };
        t.execute();
        Thread.yield();
        for (int i = 0; i < 1000; i++) {
            conn.createStatement().execute("analyze");
        }
        t.get();
        stat.execute("drop table test");
    }
}

Example 14 with Analyze

use of org.h2.command.ddl.Analyze in project h2database by h2database.

the class TestOptimizations method testFastRowIdCondition.

private void testFastRowIdCondition() throws Exception {
    Connection conn = getConnection("optimizations");
    Statement stat = conn.createStatement();
    stat.executeUpdate("create table many(id int) " + "as select x from system_range(1, 10000)");
    ResultSet rs = stat.executeQuery("explain analyze select * from many " + "where _rowid_ = 400");
    rs.next();
    assertContains(rs.getString(1), "/* scanCount: 2 */");
    conn.close();
}

Example 15 with Analyze

use of org.h2.command.ddl.Analyze in project h2database by h2database.

the class TestOptimizations method testUseIndexWhenAllColumnsNotInOrderBy.

private void testUseIndexWhenAllColumnsNotInOrderBy() throws SQLException {
    deleteDb("optimizations");
    Connection conn = getConnection("optimizations");
    Statement stat = conn.createStatement();
    stat.execute("create table test(id int primary key, account int, tx int)");
    stat.execute("insert into test select x, x*100, x from system_range(1, 10000)");
    stat.execute("analyze sample_size 5");
    stat.execute("create unique index idx_test_account_tx on test(account, tx desc)");
    ResultSet rs;
    rs = stat.executeQuery("explain analyze " + "select tx from test " + "where account=22 and tx<9999999 " + "order by tx desc limit 25");
    rs.next();
    String plan = rs.getString(1);
    assertContains(plan, "index sorted");
    conn.close();
}