diff --git a/db/builder.cc b/db/builder.cc
index 7cf13f8..a26d81f 100644
--- a/db/builder.cc
+++ b/db/builder.cc
@@ -40,9 +40,16 @@ Status BuildTable(const std::string& dbname, Env* env, const Options& options,
     TableBuilder* builder = new TableBuilder(options, file);
     meta->smallest.DecodeFrom(iter->key());
     Slice key;
+    Slice value;
     for (; iter->Valid(); iter->Next()) {
       key = iter->key();
-      builder->Add(key, iter->value());
+      value=iter->value();
+      if(meta->valuelog_id==0&&value.size()>0&&value.data()[0]==(char)(0x01)){
+        Slice tmp_value=value;
+        tmp_value.remove_prefix(1);
+        assert(GetVarint64(&tmp_value,&meta->valuelog_id));
+      }
+      builder->Add(key, value);
     }
     if (!key.empty()) {
       meta->largest.DecodeFrom(key);
diff --git a/db/db_impl.cc b/db/db_impl.cc
index 9f51f7b..78b92e0 100644
--- a/db/db_impl.cc
+++ b/db/db_impl.cc
@@ -1575,17 +1575,6 @@ void DBImpl::GetApproximateSizes(const Range* range, int n, uint64_t* sizes) {
   v->Unref();
 }
 std::vector<std::pair<uint64_t,std::pair<uint64_t,uint64_t>>> DBImpl::WriteValueLog(std::vector<Slice> values){
-  //lock
-  // std::vector<std::pair<uint64_t,std::pair<uint64_t,uint64_t>>> res;
-  // for(int i=0;i<values.size();i++){
-  //   int len=values[i].size();
-  //   valuelogfile_->Append(values[i]);
-  //   res.push_back({valuelogfile_number_,{valuelogfile_offset,len}});
-  //   valuelogfile_offset+=len;
-  // }
-  // //unlock
-  // valuelogfile_->Flush();
-  // return res;
   std::string file_name_=ValueLogFileName(dbname_,valuelogfile_number_);
   std::ofstream valueFile(file_name_, std::ios::app | std::ios::binary);
   if (!valueFile.is_open()) {
diff --git a/test/test.cpp b/test/test.cpp
index 78240d9..37eb607 100644
--- a/test/test.cpp
+++ b/test/test.cpp
@@ -167,16 +167,17 @@ TEST(Test, LARGE_DATA_COMPACT_TEST) {
         abort();
     }
     std::vector<std::string> values;
-    for(int i=0;i<500000;i++){
+    for(int i=0;i<5000;i++){
         std::string key=std::to_string(i);
         std::string value;
-        for(int j=0;j<1000;j++){
+        int len=rand()%496+5;
+        for(int j=0;j<len;j++){
             value+=std::to_string(i);
         }
         values.push_back(value);
         db->Put(writeOptions,key,value);
     }
-    for(int i=0;i<500000;i++){
+    for(int i=0;i<5000;i++){
         std::string key=std::to_string(i);
         std::string value;
         Status s=db->Get(readOptions,key,&value);