diff --git a/config/config.go b/config/config.go
index aa74c9d..aa3c1cf 100644
--- a/config/config.go
+++ b/config/config.go
@@ -62,9 +62,9 @@ type Config struct {
 
 	DataDir string `toml:"data_dir"`
 
-	DBName string `toml:"db_name"`
-
-	DBPath string `toml:"db_path"`
+	DBName       string `toml:"db_name"`
+	DBPath       string `toml:"db_path"`
+	DBSyncCommit int    `toml:"db_sync_commit"`
 
 	LevelDB LevelDBConfig `toml:"leveldb"`
 
diff --git a/config/config.toml b/config/config.toml
index 8a8cfba..690db30 100644
--- a/config/config.toml
+++ b/config/config.toml
@@ -35,6 +35,12 @@ db_name = "leveldb"
 # If not set, use data_dir/"db_name"_data
 db_path = ""
 
+# Sync commit to disk if possible
+#  0: no sync 
+#  1: sync every second 
+#  2: sync every commit 
+db_sync_commit = 0
+
 # enable replication or not
 use_replication = true
 
diff --git a/etc/ledis.conf b/etc/ledis.conf
index 27de6c5..690db30 100644
--- a/etc/ledis.conf
+++ b/etc/ledis.conf
@@ -35,6 +35,12 @@ db_name = "leveldb"
 # If not set, use data_dir/"db_name"_data
 db_path = ""
 
+# Sync commit to disk if possible
+#  0: no sync 
+#  1: sync every second 
+#  2: sync every commit 
+db_sync_commit = 0
+
 # enable replication or not
 use_replication = true
 
@@ -81,7 +87,7 @@ compression = true
 [snapshot]
 # Path to store snapshot dump file
 # if not set, use data_dir/snapshot
-# snapshot file name format is snap-2006-01-02T15:04:05.999999999.dmp
+# snapshot file name format is dmp-2006-01-02T15:04:05.999999999
 path = ""
 
 # Reserve newest max_num snapshot dump files
diff --git a/rpl/goleveldb_store.go b/rpl/goleveldb_store.go
index c00f36c..39bf63a 100644
--- a/rpl/goleveldb_store.go
+++ b/rpl/goleveldb_store.go
@@ -21,8 +21,6 @@ type GoLevelDBStore struct {
 
 	first uint64
 	last  uint64
-
-	lastCommit time.Time
 }
 
 func (s *GoLevelDBStore) FirstID() (uint64, error) {
@@ -134,17 +132,7 @@ func (s *GoLevelDBStore) StoreLogs(logs []*Log) error {
 		w.Put(key, buf.Bytes())
 	}
 
-	n := time.Now()
-	if s.cfg.Replication.SyncLog == 2 ||
-		(s.cfg.Replication.SyncLog == 1 && n.Sub(s.lastCommit) > time.Second) {
-		err = w.SyncCommit()
-	} else {
-		err = w.Commit()
-	}
-
-	s.lastCommit = n
-
-	if err != nil {
+	if err = w.Commit(); err != nil {
 		return err
 	}
 
@@ -268,7 +256,7 @@ func (s *GoLevelDBStore) open() error {
 	return err
 }
 
-func NewGoLevelDBStore(base string) (*GoLevelDBStore, error) {
+func NewGoLevelDBStore(base string, syncLog int) (*GoLevelDBStore, error) {
 	cfg := config.NewConfigDefault()
 	cfg.DBName = "goleveldb"
 	cfg.DBPath = base
@@ -276,6 +264,7 @@ func NewGoLevelDBStore(base string) (*GoLevelDBStore, error) {
 	cfg.LevelDB.CacheSize = 64 * 1024 * 1024
 	cfg.LevelDB.WriteBufferSize = 64 * 1024 * 1024
 	cfg.LevelDB.Compression = false
+	cfg.DBSyncCommit = syncLog
 
 	s := new(GoLevelDBStore)
 	s.cfg = cfg
diff --git a/rpl/rpl.go b/rpl/rpl.go
index 3eaad9a..d862132 100644
--- a/rpl/rpl.go
+++ b/rpl/rpl.go
@@ -49,7 +49,7 @@ func NewReplication(cfg *config.Config) (*Replication, error) {
 	r.cfg = cfg
 
 	var err error
-	if r.s, err = NewGoLevelDBStore(path.Join(base, "wal")); err != nil {
+	if r.s, err = NewGoLevelDBStore(path.Join(base, "wal"), cfg.Replication.SyncLog); err != nil {
 		return nil, err
 	}
 
diff --git a/rpl/store_test.go b/rpl/store_test.go
index ddb43f0..0dda1ce 100644
--- a/rpl/store_test.go
+++ b/rpl/store_test.go
@@ -16,7 +16,7 @@ func TestGoLevelDBStore(t *testing.T) {
 	defer os.RemoveAll(dir)
 
 	// New level
-	l, err := NewGoLevelDBStore(dir)
+	l, err := NewGoLevelDBStore(dir, 0)
 	if err != nil {
 		t.Fatalf("err: %v ", err)
 	}
diff --git a/store/db.go b/store/db.go
index c238016..b2d116b 100644
--- a/store/db.go
+++ b/store/db.go
@@ -1,15 +1,27 @@
 package store
 
 import (
+	"github.com/siddontang/ledisdb/config"
 	"github.com/siddontang/ledisdb/store/driver"
+	"sync"
 	"time"
 )
 
 type DB struct {
-	driver.IDB
+	db   driver.IDB
 	name string
 
 	st *Stat
+
+	cfg *config.Config
+
+	lastCommit time.Time
+
+	m sync.Mutex
+}
+
+func (db *DB) Close() error {
+	return db.db.Close()
 }
 
 func (db *DB) String() string {
@@ -20,43 +32,46 @@ func (db *DB) NewIterator() *Iterator {
 	db.st.IterNum.Add(1)
 
 	it := new(Iterator)
-	it.it = db.IDB.NewIterator()
+	it.it = db.db.NewIterator()
 	it.st = db.st
 
 	return it
 }
 
 func (db *DB) Get(key []byte) ([]byte, error) {
-	v, err := db.IDB.Get(key)
+	v, err := db.db.Get(key)
 	db.st.statGet(v, err)
 	return v, err
 }
 
 func (db *DB) Put(key []byte, value []byte) error {
 	db.st.PutNum.Add(1)
-	return db.IDB.Put(key, value)
+
+	if db.needSyncCommit() {
+		return db.db.SyncPut(key, value)
+
+	} else {
+		return db.db.Put(key, value)
+
+	}
 }
 
 func (db *DB) Delete(key []byte) error {
 	db.st.DeleteNum.Add(1)
-	return db.IDB.Delete(key)
-}
 
-func (db *DB) SyncPut(key []byte, value []byte) error {
-	db.st.SyncPutNum.Add(1)
-	return db.IDB.SyncPut(key, value)
-}
-
-func (db *DB) SyncDelete(key []byte) error {
-	db.st.SyncDeleteNum.Add(1)
-	return db.IDB.SyncDelete(key)
+	if db.needSyncCommit() {
+		return db.db.SyncDelete(key)
+	} else {
+		return db.db.Delete(key)
+	}
 }
 
 func (db *DB) NewWriteBatch() *WriteBatch {
 	db.st.BatchNum.Add(1)
 	wb := new(WriteBatch)
-	wb.IWriteBatch = db.IDB.NewWriteBatch()
+	wb.wb = db.db.NewWriteBatch()
 	wb.st = db.st
+	wb.db = db
 	return wb
 }
 
@@ -65,7 +80,7 @@ func (db *DB) NewSnapshot() (*Snapshot, error) {
 
 	var err error
 	s := &Snapshot{}
-	if s.ISnapshot, err = db.IDB.NewSnapshot(); err != nil {
+	if s.ISnapshot, err = db.db.NewSnapshot(); err != nil {
 		return nil, err
 	}
 	s.st = db.st
@@ -77,7 +92,7 @@ func (db *DB) Compact() error {
 	db.st.CompactNum.Add(1)
 
 	t := time.Now()
-	err := db.IDB.Compact()
+	err := db.db.Compact()
 
 	db.st.CompactTotalTime.Add(time.Now().Sub(t))
 
@@ -107,7 +122,7 @@ func (db *DB) RevRangeLimitIterator(min []byte, max []byte, rangeType uint8, off
 }
 
 func (db *DB) Begin() (*Tx, error) {
-	tx, err := db.IDB.Begin()
+	tx, err := db.db.Begin()
 	if err != nil {
 		return nil, err
 	}
@@ -120,3 +135,24 @@ func (db *DB) Begin() (*Tx, error) {
 func (db *DB) Stat() *Stat {
 	return db.st
 }
+
+func (db *DB) needSyncCommit() bool {
+	if db.cfg.DBSyncCommit == 0 {
+		return false
+	} else if db.cfg.DBSyncCommit == 2 {
+		return true
+	} else {
+		n := time.Now()
+		need := false
+		db.m.Lock()
+
+		if n.Sub(db.lastCommit) > time.Second {
+			need = true
+		}
+		db.lastCommit = n
+
+		db.m.Unlock()
+		return need
+	}
+
+}
diff --git a/store/stat.go b/store/stat.go
index 75436fe..0b535d0 100644
--- a/store/stat.go
+++ b/store/stat.go
@@ -5,25 +5,22 @@ import (
 )
 
 type Stat struct {
-	GetNum             sync2.AtomicInt64
-	GetMissingNum      sync2.AtomicInt64
-	PutNum             sync2.AtomicInt64
-	DeleteNum          sync2.AtomicInt64
-	SyncPutNum         sync2.AtomicInt64
-	SyncDeleteNum      sync2.AtomicInt64
-	IterNum            sync2.AtomicInt64
-	IterSeekNum        sync2.AtomicInt64
-	IterCloseNum       sync2.AtomicInt64
-	SnapshotNum        sync2.AtomicInt64
-	SnapshotCloseNum   sync2.AtomicInt64
-	BatchNum           sync2.AtomicInt64
-	BatchCommitNum     sync2.AtomicInt64
-	BatchSyncCommitNum sync2.AtomicInt64
-	TxNum              sync2.AtomicInt64
-	TxCommitNum        sync2.AtomicInt64
-	TxCloseNum         sync2.AtomicInt64
-	CompactNum         sync2.AtomicInt64
-	CompactTotalTime   sync2.AtomicDuration
+	GetNum           sync2.AtomicInt64
+	GetMissingNum    sync2.AtomicInt64
+	PutNum           sync2.AtomicInt64
+	DeleteNum        sync2.AtomicInt64
+	IterNum          sync2.AtomicInt64
+	IterSeekNum      sync2.AtomicInt64
+	IterCloseNum     sync2.AtomicInt64
+	SnapshotNum      sync2.AtomicInt64
+	SnapshotCloseNum sync2.AtomicInt64
+	BatchNum         sync2.AtomicInt64
+	BatchCommitNum   sync2.AtomicInt64
+	TxNum            sync2.AtomicInt64
+	TxCommitNum      sync2.AtomicInt64
+	TxCloseNum       sync2.AtomicInt64
+	CompactNum       sync2.AtomicInt64
+	CompactTotalTime sync2.AtomicDuration
 }
 
 func (st *Stat) statGet(v []byte, err error) {
@@ -35,23 +32,4 @@ func (st *Stat) statGet(v []byte, err error) {
 
 func (st *Stat) Reset() {
 	*st = Stat{}
-	// st.GetNum.Set(0)
-	// st.GetMissingNum.Set(0)
-	// st.PutNum.Set(0)
-	// st.DeleteNum.Set(0)
-	// st.SyncPutNum.Set(0)
-	// st.SyncDeleteNum.Set(0)
-	// st.IterNum.Set(0)
-	// st.IterSeekNum.Set(0)
-	// st.IterCloseNum.Set(0)
-	// st.SnapshotNum.Set(0)
-	// st.SnapshotCloseNum.Set(0)
-	// st.BatchNum.Set(0)
-	// st.BatchCommitNum.Set(0)
-	// st.BatchSyncCommitNum.Set(0)
-	// st.TxNum.Set(0)
-	// st.TxCommitNum.Set(0)
-	// st.TxCloseNum.Set(0)
-	// st.CompactNum.Set(0)
-	// st.CompactTotalTime.Set(0)
 }
diff --git a/store/store.go b/store/store.go
index d882e48..3ad8a54 100644
--- a/store/store.go
+++ b/store/store.go
@@ -40,7 +40,11 @@ func Open(cfg *config.Config) (*DB, error) {
 		return nil, err
 	}
 
-	db := &DB{idb, s.String(), &Stat{}}
+	db := new(DB)
+	db.db = idb
+	db.name = s.String()
+	db.st = &Stat{}
+	db.cfg = cfg
 
 	return db, nil
 }
diff --git a/store/tx.go b/store/tx.go
index 494219d..6845ee5 100644
--- a/store/tx.go
+++ b/store/tx.go
@@ -5,13 +5,13 @@ import (
 )
 
 type Tx struct {
-	driver.Tx
+	tx driver.Tx
 	st *Stat
 }
 
 func (tx *Tx) NewIterator() *Iterator {
 	it := new(Iterator)
-	it.it = tx.Tx.NewIterator()
+	it.it = tx.tx.NewIterator()
 	it.st = tx.st
 
 	tx.st.IterNum.Add(1)
@@ -23,7 +23,7 @@ func (tx *Tx) NewWriteBatch() *WriteBatch {
 	tx.st.BatchNum.Add(1)
 
 	wb := new(WriteBatch)
-	wb.IWriteBatch = tx.Tx.NewWriteBatch()
+	wb.wb = tx.tx.NewWriteBatch()
 	wb.st = tx.st
 	return wb
 }
@@ -51,26 +51,26 @@ func (tx *Tx) RevRangeLimitIterator(min []byte, max []byte, rangeType uint8, off
 }
 
 func (tx *Tx) Get(key []byte) ([]byte, error) {
-	v, err := tx.Tx.Get(key)
+	v, err := tx.tx.Get(key)
 	tx.st.statGet(v, err)
 	return v, err
 }
 
 func (tx *Tx) Put(key []byte, value []byte) error {
 	tx.st.PutNum.Add(1)
-	return tx.Tx.Put(key, value)
+	return tx.tx.Put(key, value)
 }
 
 func (tx *Tx) Delete(key []byte) error {
 	tx.st.DeleteNum.Add(1)
-	return tx.Tx.Delete(key)
+	return tx.tx.Delete(key)
 }
 
 func (tx *Tx) Commit() error {
 	tx.st.TxCommitNum.Add(1)
-	return tx.Tx.Commit()
+	return tx.tx.Commit()
 }
 
 func (tx *Tx) Rollback() error {
-	return tx.Tx.Rollback()
+	return tx.tx.Rollback()
 }
diff --git a/store/writebatch.go b/store/writebatch.go
index e1235df..bf4658c 100644
--- a/store/writebatch.go
+++ b/store/writebatch.go
@@ -5,20 +5,22 @@ import (
 )
 
 type WriteBatch struct {
-	driver.IWriteBatch
+	wb        driver.IWriteBatch
 	st        *Stat
 	putNum    int64
 	deleteNum int64
+
+	db *DB
 }
 
 func (wb *WriteBatch) Put(key []byte, value []byte) {
 	wb.putNum++
-	wb.IWriteBatch.Put(key, value)
+	wb.wb.Put(key, value)
 }
 
 func (wb *WriteBatch) Delete(key []byte) {
 	wb.deleteNum++
-	wb.IWriteBatch.Delete(key)
+	wb.wb.Delete(key)
 }
 
 func (wb *WriteBatch) Commit() error {
@@ -27,18 +29,13 @@ func (wb *WriteBatch) Commit() error {
 	wb.st.DeleteNum.Add(wb.deleteNum)
 	wb.putNum = 0
 	wb.deleteNum = 0
-	return wb.IWriteBatch.Commit()
-}
-
-func (wb *WriteBatch) SyncCommit() error {
-	wb.st.BatchSyncCommitNum.Add(1)
-	wb.st.SyncPutNum.Add(wb.putNum)
-	wb.st.SyncDeleteNum.Add(wb.deleteNum)
-	wb.putNum = 0
-	wb.deleteNum = 0
-	return wb.IWriteBatch.SyncCommit()
+	if wb.db == nil || !wb.db.needSyncCommit() {
+		return wb.wb.Commit()
+	} else {
+		return wb.wb.SyncCommit()
+	}
 }
 
 func (wb *WriteBatch) Rollback() error {
-	return wb.IWriteBatch.Rollback()
+	return wb.wb.Rollback()
 }