DB db = DBMaker.fileDB("testread.db")
        .allocateStartSize(1024*1024*1024)
        .allocateIncrement(1024*1024*100)
        .fileMmapEnableIfSupported()
        .fileChannelEnable()
        .checksumStoreEnable().make();

HTreeMap<String,Object[]> map = db.hashMap("testRead", Serializer.STRING, new SerializerArray<Object>(Serializer.JAVA))
        .createOrOpen();

long t1 = System.currentTimeMillis();
for (int j=1;j<11;j++) {
    long t2 = System.currentTimeMillis();
    for (int i = 0; i < 1000000; i++) {
        map.putIfAbsent("item" + i*j, new Object[]{1, 2, 3, i, System.nanoTime(), System.currentTimeMillis(), new Date().toString()});
    }
    System.out.println(System.currentTimeMillis()-t2);
    db.commit();
}
System.out.println(System.currentTimeMillis()-t1);

db.commit();
db.close();

db.treeMap("",Serializer.BYTE_ARRAY,Serializer.BYTE_ARRAY)
                .createOrOpen().prefixSubMap("item1".getBytes());

        db.treeMap("",Serializer.BYTE_ARRAY,Serializer.BYTE_ARRAY)
                .createOrOpen().subMap("item1".getBytes(),"item2".getBytes());

db.treeMap("",new SerializerArray<Long>(Serializer.LONG),Serializer.BYTE_ARRAY)
                .createOrOpen().prefixSubMap(new Long[] { null, 1L, 2L };);