diff --git a/src/main/java/io/github/chronosx88/dhtBootstrap/CompareLong.java b/src/main/java/io/github/chronosx88/dhtBootstrap/CompareLong.java
new file mode 100644
index 0000000..159f1d4
--- /dev/null
+++ b/src/main/java/io/github/chronosx88/dhtBootstrap/CompareLong.java
@@ -0,0 +1,14 @@
+package io.github.chronosx88.dhtBootstrap;
+
+import java.io.Serializable;
+import java.util.Comparator;
+
+public class CompareLong implements Comparator<byte[]>, Serializable {
+    @Override
+    public int compare(byte[] o1, byte[] o2) {
+        Serializer<Long> serializer = new Serializer<>();
+        Long num1 = serializer.deserialize(o1);
+        Long num2 = serializer.deserialize(o2);
+        return num1.compareTo(num2);
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/io/github/chronosx88/dhtBootstrap/CompareNumber640.java b/src/main/java/io/github/chronosx88/dhtBootstrap/CompareNumber640.java
new file mode 100644
index 0000000..7a5599d
--- /dev/null
+++ b/src/main/java/io/github/chronosx88/dhtBootstrap/CompareNumber640.java
@@ -0,0 +1,16 @@
+package io.github.chronosx88.dhtBootstrap;
+
+import net.tomp2p.peers.Number640;
+
+import java.io.Serializable;
+import java.util.Comparator;
+
+public class CompareNumber640 implements Comparator<byte[]>, Serializable {
+    @Override
+    public int compare(byte[] o1, byte[] o2) {
+        Serializer<Number640> serializer = new Serializer<>();
+        Number640 num1 = serializer.deserialize(o1);
+        Number640 num2 = serializer.deserialize(o2);
+        return num1.compareTo(num2);
+    }
+}
diff --git a/src/main/kotlin/io/github/chronosx88/dhtBootstrap/StorageBerkeleyDB.kt b/src/main/kotlin/io/github/chronosx88/dhtBootstrap/StorageBerkeleyDB.kt
index ff0e8a2..d4aa361 100644
--- a/src/main/kotlin/io/github/chronosx88/dhtBootstrap/StorageBerkeleyDB.kt
+++ b/src/main/kotlin/io/github/chronosx88/dhtBootstrap/StorageBerkeleyDB.kt
@@ -47,16 +47,24 @@ class StorageBerkeleyDB(peerId: Number160, path : File, signatureFactory: Signat
         val envConfig = EnvironmentConfig()
         envConfig.allowCreate = true
         dbEnvironment = Environment(path, envConfig)
-        val dbConfig = DatabaseConfig()
-        dbConfig.allowCreate = true
+        val configMap : HashMap<String, com.sleepycat.je.DatabaseConfig> = HashMap()
 
-        dataMapDB = dbEnvironment.openDatabase(null, "dataMap_$peerId", dbConfig)
-        timeoutMapDB = dbEnvironment.openDatabase(null, "timeoutMap_$peerId", dbConfig)
-        timeoutMapRevDB = dbEnvironment.openDatabase(null, "timeoutMapRev_$peerId", dbConfig)
-        protectedDomainMapDB = dbEnvironment.openDatabase(null, "protectedDomainMap_$peerId", dbConfig)
-        protectedEntryMapDB = dbEnvironment.openDatabase(null, "protectedEntryMap_$peerId", dbConfig)
-        responsibilityMapDB = dbEnvironment.openDatabase(null, "responsibilityMap_$peerId", dbConfig)
-        responsibilityMapRevDB = dbEnvironment.openDatabase(null, "responsibilityMapRev_$peerId", dbConfig)
+        val compareNumber640 = CompareNumber640()
+        val compareLong = CompareLong()
+        configMap["dataMapConfig"] = DatabaseConfig().setBtreeComparator(compareNumber640)
+        configMap["dataMapConfig"]!!.allowCreate = true
+        configMap["timeoutMapRevConfig"] = DatabaseConfig().setBtreeComparator(compareLong)
+        configMap["timeoutMapRevConfig"]!!.allowCreate = true
+        configMap["other"] = DatabaseConfig()
+        configMap["other"]!!.allowCreate = true
+
+        dataMapDB = dbEnvironment.openDatabase(null, "dataMap_$peerId", configMap["dataMapConfig"])
+        timeoutMapDB = dbEnvironment.openDatabase(null, "timeoutMap_$peerId", configMap["other"])
+        timeoutMapRevDB = dbEnvironment.openDatabase(null, "timeoutMapRev_$peerId", configMap["timeoutMapRevConfig"])
+        protectedDomainMapDB = dbEnvironment.openDatabase(null, "protectedDomainMap_$peerId", configMap["other"])
+        protectedEntryMapDB = dbEnvironment.openDatabase(null, "protectedEntryMap_$peerId", configMap["other"])
+        responsibilityMapDB = dbEnvironment.openDatabase(null, "responsibilityMap_$peerId", configMap["other"])
+        responsibilityMapRevDB = dbEnvironment.openDatabase(null, "responsibilityMapRev_$peerId", configMap["other"])
 
         storageCheckIntervalMillis = 60 * 1000