diff --git a/cpp/src/db/db.h b/cpp/src/db/db.h
index 60323d3909e88cb94465789f8f3563b403a37791..525a661e1eb801cac085121fa6b146286686d385 100644
--- a/cpp/src/db/db.h
+++ b/cpp/src/db/db.h
@@ -21,17 +21,8 @@ public:
             GroupSchema& group_info_) = 0;
     virtual Status get_group(const std::string& group_id_, GroupSchema& group_info_) = 0;
     virtual Status has_group(const std::string& group_id_, bool& has_or_not_) = 0;
-
-    virtual Status add_group_file(const std::string& group_id_,
-                                  GroupFileSchema& group_file_info_) = 0;
-    virtual Status has_group_file(const std::string& group_id_,
-                                  const std::string& file_id_,
-                                  bool& has_or_not_) = 0;
-    virtual Status get_group_file(const std::string& group_id_,
-                                  const std::string& file_id_,
-                                  GroupFileSchema& group_file_info_) = 0;
-
     virtual Status get_group_files(const std::string& group_id_,
+                                   const int date_delta_,
                                    GroupFilesSchema& group_files_info_) = 0;
 
     DB() = default;
diff --git a/cpp/src/db/db_impl.cpp b/cpp/src/db/db_impl.cpp
index 3fdbdf01e0753e5e99eb423f4c72bacc97895531..332942073cbc1f1b9d05a0df7c3b0a36ed83bbe3 100644
--- a/cpp/src/db/db_impl.cpp
+++ b/cpp/src/db/db_impl.cpp
@@ -8,15 +8,32 @@ DBImpl::DBImpl(const Options& options_, const std::string& name_)
       _env(options_.env),
       _options(options_),
       _bg_work_finish_signal(_mutex),
-      _bg_compaction_scheduled(false) {
+      _bg_compaction_scheduled(false),
+      _pMeta(new DBMetaImpl(*(_options.pMetaOptions))) {
 }
 
 Status DBImpl::add_group(const GroupOptions& options_,
         const std::string& group_id_,
-        std::string& gid_) {
+        GroupSchema& group_info_) {
     assert((!options_.has_id) ||
             (options_.has_id && ("" != group_id_)));
 
+    return _pMeta->add_group(options_, group_id, group_info_);
+}
+
+Status DBImpl::get_group(const std::string& group_id_, GroupSchema& group_info_) {
+    return _pMeta->get_group(group_id_, group_info_);
+}
+
+Status DBImpl::has_group(const std::string& group_id_, bool& has_or_not_) {
+    return _pMeta->has_group(group_id_, has_or_not_);
+}
+
+Status DBImpl::get_group_files(const std::string& group_id_,
+                               const int date_delta_,
+                               GroupFilesSchema& group_files_info_) {
+    return _pMeta->get_group_files(group_id_, date_delta_, group_file_info_);
+
 }
 
 void DBImpl::try_schedule_compaction() {
diff --git a/cpp/src/db/db_impl.h b/cpp/src/db/db_impl.h
index b0de407d6bee7ea24025649888df295cf2c4fb8e..f93a14e798792128142d49e3a6033b5e6ee749ae 100644
--- a/cpp/src/db/db_impl.h
+++ b/cpp/src/db/db_impl.h
@@ -19,7 +19,13 @@ public:
 
     virtual Status add_group(GroupOptions options_,
             const std::string& group_id_,
-            std::string& gid_) override;
+            GroupSchema& group_info_) override;
+    virtual Status get_group(const std::string& group_id_, GroupSchema& group_info_) override;
+    virtual Status has_group(const std::string& group_id_, bool& has_or_not_) override;
+
+    virtual Status get_group_files(const std::string& group_id_,
+                                   const int date_delta_,
+                                   GroupFilesSchema& group_files_info_) override;
 
     void try_schedule_compaction();
 
@@ -43,6 +49,7 @@ private:
     Status _bg_error;
 
     MemManager _memMgr;
+    std::shared_ptr<Meta> _pMeta;
 
 }; // DBImpl
 
diff --git a/cpp/src/db/db_meta.h b/cpp/src/db/db_meta.h
index 10868c44f1a109633a63ce3cc2c9bc116bf19589..0570c44eba56aa676a43e36ae6d28c896ca67d05 100644
--- a/cpp/src/db/db_meta.h
+++ b/cpp/src/db/db_meta.h
@@ -50,6 +50,7 @@ public:
     virtual Status update_group_file(const GroupFileSchema& group_file_) = 0;
 
     virtual Status get_group_files(const std::string& group_id_,
+                                   const int date_delta_,
                                    GroupFilesSchema& group_files_info_) = 0;
 
 }; // MetaData
diff --git a/cpp/src/db/db_meta_impl.cpp b/cpp/src/db/db_meta_impl.cpp
index 6eace00eb1be4616438f7b4dba72779aa77527e7..61562378f9a46bfc8eeb3db77e8c5ed7906be845 100644
--- a/cpp/src/db/db_meta_impl.cpp
+++ b/cpp/src/db/db_meta_impl.cpp
@@ -52,6 +52,7 @@ Status DBMetaImpl::get_group_file(const std::string& group_id_,
 }
 
 Status DBMetaImpl::get_group_files(const std::string& group_id_,
+                               const int date_delta_,
                                GroupFilesSchema& group_files_info_) {
     // PXU TODO
     return Status.OK();
diff --git a/cpp/src/db/db_meta_impl.h b/cpp/src/db/db_meta_impl.h
index b0745ec93572340847348e1e609e4e2aebd3bb5a..690fadf92d8f8b75dc55594376ae993d34228dcf 100644
--- a/cpp/src/db/db_meta_impl.h
+++ b/cpp/src/db/db_meta_impl.h
@@ -29,6 +29,7 @@ public:
     virtual Status update_group_file(const GroupFileSchema& group_file_) override;
 
     virtual Status get_group_files(const std::string& group_id_,
+                                   const int date_delta_,
                                    GroupFilesSchema& group_files_info_) override;
 
 private:
diff --git a/cpp/src/db/options.h b/cpp/src/db/options.h
index 283c1905fcfae80bbce02f5df8ca1c67ab9ca16f..7da3e3ce8be3ee870434ce3e4d2d949c9178ebbe 100644
--- a/cpp/src/db/options.h
+++ b/cpp/src/db/options.h
@@ -2,15 +2,19 @@
 #define VECENGINE_OPTIONS_H_
 
 #include <string>
+#include <memory>
 
 namespace zilliz {
 namespace vecwise {
 namespace engine {
 
+class MetaOptions;
+
 struct Options {
     uint16_t  memory_sync_interval = 10;
     uint16_t  raw_file_merge_trigger_number = 100;
     size_t  raw_to_index_trigger_size = 100000;
+    std::shared_ptr<MetaOptions> pMetaOptions;
 }; // Options