diff --git a/benchmarks/db_bench_FieldDB.cc b/benchmarks/db_bench_FieldDB.cc
index 3abf7c5..dfb8f61 100644
--- a/benchmarks/db_bench_FieldDB.cc
+++ b/benchmarks/db_bench_FieldDB.cc
@@ -63,6 +63,10 @@ static const char* FLAGS_benchmarks =
     "readreverse,"
     "fill100K,"
     "crc32c,"
+    "CreateIndex,"
+    "FindKeysByField,"
+    "QueryByIndex,"
+    "DeleteIndex,"
     "snappycomp,"
     "snappyuncomp,"
     "zstdcomp,"
@@ -635,6 +639,14 @@ class Benchmark {
         method = &Benchmark::Compact;
       } else if (name == Slice("crc32c")) {
         method = &Benchmark::Crc32c;
+      } else if (name == Slice("CreateIndex")) {
+        method = &Benchmark::CreateIndex;
+      } else if (name == Slice("FindKeysByField")) {
+        method = &Benchmark::FindKeysByField;
+      } else if (name == Slice("QueryByIndex")) {
+        method = &Benchmark::QueryByIndex;
+      } else if (name == Slice("DeleteIndex")) {
+        method = &Benchmark::DeleteIndex;
       } else if (name == Slice("snappycomp")) {
         method = &Benchmark::SnappyCompress;
       } else if (name == Slice("snappyuncomp")) {
@@ -664,7 +676,7 @@ class Benchmark {
         } else {
           delete db_;
           db_ = nullptr;
-          //DestroyDB(FLAGS_db, Options());
+          DestroyDB(FLAGS_db, Options());
           Open();
         }
       }
@@ -821,7 +833,7 @@ class Benchmark {
     options.compression =
         FLAGS_compression ? kSnappyCompression : kNoCompression;
     // Status s = DB::Open(options, FLAGS_db, &db_);
-    fielddb::DestroyDB(FLAGS_db, options);
+    //fielddb::DestroyDB(FLAGS_db, options);
     db_ = new FieldDB();
     Status s = FieldDB::OpenFieldDB(options, FLAGS_db, &db_);
     if (!s.ok()) {
@@ -870,7 +882,7 @@ class Benchmark {
           {"age", age},
           {"tag", tag}
         };
-        Slice value = SerializeValue(fields);
+        std::string value = SerializeValue(fields);
         batch.Put(key.slice(), value);
         bytes += value.size() + key.slice().size();
         thread->stats.FinishedSingleOp();
@@ -1078,6 +1090,27 @@ class Benchmark {
       g_env->RemoveFile(fname);
     }
   }
+
+  void CreateIndex(ThreadState* thread) {
+    db_->CreateIndexOnField("age", write_options_);
+  }
+
+  void FindKeysByField(ThreadState* thread) {
+    Field f = {"age", "20"};
+    std::vector<std::string> res;
+    res = db_->FindKeysByField(f);
+  }
+
+  void QueryByIndex(ThreadState* thread) {
+    Field f = {"age", "20"};
+    Status s;
+    db_->QueryByIndex(f, &s);    
+  }
+
+  void DeleteIndex(ThreadState* thread) {
+    db_->DeleteIndex("age", write_options_);
+  }
+  
 };
 
 }  // namespace leveldb
diff --git a/util/serialize_value.cc b/util/serialize_value.cc
index 73fb092..a66aef7 100644
--- a/util/serialize_value.cc
+++ b/util/serialize_value.cc
@@ -36,6 +36,7 @@ FieldArray *ParseValue(const std::string& value_str,FieldArray *fields){
             res->emplace_back(nameStr, valStr);
         } else {
             std::cout << "name and val not match! From ParseValue" << std::endl;
+            assert(0);
         }
         nameSlice.clear();
         valSlice.clear();