diff --git a/performanceDb/build.gradle b/performanceDb/build.gradle
index 7121f16..b0a86d4 100644
--- a/performanceDb/build.gradle
+++ b/performanceDb/build.gradle
@@ -4,5 +4,6 @@ dependencies {
 	compile 'org.lucares:ludb:1.0.20161002111352'
 	//compile 'commons-io:commons-io:2.5'
 	//compile 'joda-time:joda-time:2.9.6'
+	compile 'com.fasterxml.jackson.core:jackson-databind:2.8.5'
+	compile 'org.mapdb:mapdb:3.0.2'
 }
-
diff --git a/performanceDb/src/test/java/org/lucares/performance/db/ObjectMapperTest.java b/performanceDb/src/test/java/org/lucares/performance/db/ObjectMapperTest.java
new file mode 100644
index 0000000..e4d6b13
--- /dev/null
+++ b/performanceDb/src/test/java/org/lucares/performance/db/ObjectMapperTest.java
@@ -0,0 +1,320 @@
+package org.lucares.performance.db;
+
+import java.io.File;
+import java.io.Serializable;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.Set;
+import java.util.UUID;
+import java.util.concurrent.ConcurrentMap;
+import java.util.concurrent.TimeUnit;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+
+import org.lucares.ludb.FieldType;
+import org.lucares.ludb.H2DB;
+import org.mapdb.DB;
+import org.mapdb.DBMaker;
+import org.mapdb.Serializer;
+import org.testng.annotations.Test;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.ObjectWriter;
+
+import liquibase.exception.LiquibaseException;
+
+@Test
+public class ObjectMapperTest {
+	private static final File H2DB_LOCATION = new File("/tmp/h2.db");
+
+	public static class TagEntry implements Serializable {
+		private static final long serialVersionUID = 1L;
+
+		private String folder;
+
+		private Map<String, String> tags = new HashMap<>();
+
+		public TagEntry() {
+			super();
+		}
+
+		public Path getFolder() {
+			return Paths.get(folder);
+		}
+
+		public void setFolder(final Path folder) {
+			this.folder = folder.toFile().getPath();
+		}
+
+		public Map<String, String> getTags() {
+			return tags;
+		}
+
+		public void setTags(final Map<String, String> tags) {
+			this.tags = tags;
+		}
+
+		public void tag(final String key, final String value) {
+			tags.put(key, value);
+		}
+	}
+
+	public static interface TagDB {
+
+		void addTagEntry(TagEntry tagEntry);
+
+	}
+
+	public static class TagDBJson implements TagDB {
+		private List<TagEntry> tagEntries = new ArrayList<>();
+
+		private final Map<String, Map<String, Set<TagEntry>>> index = new HashMap<>();
+
+		public Map<String, Map<String, Set<TagEntry>>> index() {
+			return index;
+		}
+
+		@Override
+		public void addTagEntry(final TagEntry tagEntry) {
+			tagEntries.add(tagEntry);
+		}
+
+		public List<TagEntry> getTagEntries() {
+			return tagEntries;
+		}
+
+		public void setTagEntries(final List<TagEntry> tagEntries) {
+			this.tagEntries = tagEntries;
+
+			index.clear();
+
+			for (final TagEntry tagEntry : tagEntries) {
+				for (final Entry<String, String> t : tagEntry.getTags().entrySet()) {
+
+					final String tagKey = t.getKey();
+					final String tagValue = t.getValue();
+					index.putIfAbsent(tagKey, new HashMap<>());
+
+					final Map<String, Set<TagEntry>> tagKeyMap = index.get(tagKey);
+					tagKeyMap.putIfAbsent(tagValue, new HashSet<>());
+
+					tagKeyMap.get(tagValue).add(tagEntry);
+				}
+			}
+		}
+	}
+
+	public static class TagDBH2 implements TagDB, AutoCloseable {
+
+		private final H2DB db;
+
+		public TagDBH2() throws LiquibaseException {
+			super();
+			this.db = new H2DB(H2DB_LOCATION);
+		}
+
+		@Override
+		public void addTagEntry(final TagEntry tagEntry) {
+			final File file = tagEntry.getFolder().toFile();
+			db.addDocument(file);
+
+			tagEntry.getTags().forEach((k, v) -> {
+				try {
+					db.setProperty(file, k, v);
+				} catch (final NullPointerException e) {
+					db.createField(k, FieldType.STRING);
+					db.setProperty(file, k, v);
+				}
+			});
+
+		}
+
+		public List<TagEntry> getTagEntries() {
+			return null;
+		}
+
+		public void setTagEntries(final List<TagEntry> tagEntries) {
+			tagEntries.forEach(this::addTagEntry);
+		}
+
+		@Override
+		public void close() throws Exception {
+			db.close();
+		}
+	}
+
+	public static class TagDBMapDB implements TagDB, AutoCloseable {
+		private List<TagEntry> tagEntries = new ArrayList<>();
+
+		final DB db;
+
+		private final ConcurrentMap<String, Long> mapIndex;
+
+		private final ConcurrentMap<Long, TagEntry> mapObjects;
+
+		public TagDBMapDB() {
+			db = DBMaker.fileDB("/tmp/file4.db").fileMmapEnable().make();
+
+			mapIndex = db.hashMap("mapIndex", Serializer.STRING, Serializer.LONG).createOrOpen();
+
+			mapObjects = db.hashMap("mapObjects", Serializer.LONG, Serializer.JAVA).createOrOpen();
+		}
+
+		@Override
+		public void close() throws Exception {
+			db.close();
+		}
+
+		@Override
+		public void addTagEntry(final TagEntry tagEntry) {
+
+			final long docId = mapObjects.size();
+			mapObjects.put(docId, tagEntry);
+
+			tagEntry.getTags().forEach((k, v) -> {
+				final String tag = k + "=" + v;
+
+				mapIndex.put(tag, docId);
+
+			});
+
+		}
+
+		public List<TagEntry> getTagEntries() {
+			return tagEntries;
+		}
+
+		public void setTagEntries(final List<TagEntry> tagEntries) {
+			this.tagEntries = tagEntries;
+
+			for (final TagEntry tagEntry : tagEntries) {
+				for (final Entry<String, String> t : tagEntry.getTags().entrySet()) {
+
+					final String tagKey = t.getKey();
+					final String tagValue = t.getValue();
+					final String tag = tagKey + "=" + tagValue;
+
+					final long docId = mapObjects.size();
+					mapObjects.put(docId, tagEntry);
+
+					mapIndex.put(tag, docId);
+				}
+			}
+		}
+	}
+
+	@Test(invocationCount = 1)
+	public void testName() throws Exception {
+
+		final TagDBJson tagDB = new TagDBJson();
+		fill(tagDB);
+
+		final ObjectMapper om = new ObjectMapper();
+		final ObjectWriter ow = om.writerWithDefaultPrettyPrinter();
+
+		final File file = new File("/tmp/example.json");
+		{
+			final long start = System.nanoTime();
+			ow.writeValue(file, tagDB);
+			System.out.println("json write: " + (System.nanoTime() - start) / 1_000_000.0 + "ms");
+		}
+		{
+			final long start = System.nanoTime();
+			final TagDBJson actualTagDB = om.readValue(file, TagDBJson.class);
+			System.out.println("json read: " + (System.nanoTime() - start) / 1_000_000.0 + "ms");
+
+		}
+	}
+
+	@Test(invocationCount = 1)
+	public void testH2BD() throws Exception {
+
+		H2DB_LOCATION.delete();
+		{
+			final long start = System.nanoTime();
+			final TagDBH2 tagDB = new TagDBH2();
+			fill(tagDB);
+			System.out.println("h2 write: " + (System.nanoTime() - start) / 1_000_000.0 + "ms");
+		}
+		{
+			final long start = System.nanoTime();
+			final TagDBH2 tagDB = new TagDBH2();
+			System.out.println("h2 read: " + (System.nanoTime() - start) / 1_000_000.0 + "ms");
+
+		}
+	}
+
+	@Test(enabled = true)
+	public void testMapDB() throws Exception {
+
+		final long start = System.nanoTime();
+		try (final TagDBMapDB tagDB = new TagDBMapDB()) {
+
+			fill(tagDB);
+
+		}
+		System.out.println("mapdb write: " + (System.nanoTime() - start) / 1_000_000.0 + "ms");
+
+		final long start2 = System.nanoTime();
+		try (final TagDBMapDB tagDB = new TagDBMapDB()) {
+
+		}
+		System.out.println("mapdb read: " + (System.nanoTime() - start2) / 1_000_000.0 + "ms");
+	}
+
+	@Test(enabled = false)
+	public void testQuickstart() throws Exception {
+		final DB db = DBMaker.fileDB("/tmp/file2.db").fileMmapEnable().make();
+		final ConcurrentMap<String, Long> map = db.hashMap("map", Serializer.STRING, Serializer.LONG).createOrOpen();
+		map.put("something", 111L);
+
+		db.close();
+	}
+
+	private void fill(final TagDB tagDB) {
+
+		final List<String> pods = IntStream.rangeClosed(1, 10).mapToObj(i -> "vapondem" + i)
+				.collect(Collectors.toList());
+		final List<String> hosts = IntStream.rangeClosed(1, 10).mapToObj(i -> "host" + i).collect(Collectors.toList());
+		final List<String> versions = IntStream.rangeClosed(1, 10).mapToObj(i -> "5." + i).collect(Collectors.toList());
+		final List<String> types = Arrays.asList("app", "engine", "web", "batch");
+
+		for (final String pod : pods) {
+			for (final String host : hosts) {
+				for (final String version : versions) {
+					for (final String type : types) {
+						final TagEntry e = new TagEntry();
+
+						e.setFolder(Paths.get("/some/prefix", UUID.randomUUID().toString()));
+						e.tag("pod", pod);
+						e.tag("host", host);
+						e.tag("version", version);
+						e.tag("type", type);
+
+						tagDB.addTagEntry(e);
+					}
+				}
+
+			}
+		}
+	}
+
+	public static void main(final String[] args) throws Exception {
+		// System.out.println(System.getProperty("java.class.path"));
+		TimeUnit.SECONDS.sleep(5);
+		try (H2DB h2 = new H2DB(new File("/tmp/h2" + UUID.randomUUID().toString()))) {
+			System.out.println("done");
+		}
+
+		TimeUnit.SECONDS.sleep(10);
+		System.out.println("closing");
+	}
+
+}