diff --git a/cpp/src/db/DBImpl.cpp b/cpp/src/db/DBImpl.cpp
index d3b9e1fc1aa1d8b3bd72e9769d36df7df76742d0..3a3e738e11377b1d62a62d2d824aed79ff6eb963 100644
--- a/cpp/src/db/DBImpl.cpp
+++ b/cpp/src/db/DBImpl.cpp
@@ -104,7 +104,7 @@ Status DBImpl::CreateTable(meta::TableSchema& table_schema) {
     }
 
     meta::TableSchema temp_schema = table_schema;
-    temp_schema.index_file_size_ *= ONE_MB;
+    temp_schema.index_file_size_ *= ONE_MB; //store as MB
     return meta_ptr_->CreateTable(temp_schema);
 }
 
@@ -139,7 +139,9 @@ Status DBImpl::DescribeTable(meta::TableSchema& table_schema) {
         return Status::Error("Milsvus server is shutdown!");
     }
 
-    return meta_ptr_->DescribeTable(table_schema);
+    auto stat = meta_ptr_->DescribeTable(table_schema);
+    table_schema.index_file_size_ /= ONE_MB; //return as MB
+    return stat;
 }
 
 Status DBImpl::HasTable(const std::string& table_id, bool& has_or_not) {
@@ -255,7 +257,7 @@ Status DBImpl::CreateIndex(const std::string& table_id, const TableIndex& index)
         if(!utils::IsSameIndex(old_index, new_index)) {
             DropIndex(table_id);
 
-            status = meta_ptr_->UpdateTableIndexParam(table_id, index);
+            status = meta_ptr_->UpdateTableIndexParam(table_id, new_index);
             if (!status.ok()) {
                 ENGINE_LOG_ERROR << "Failed to update table index info for table: " << table_id;
                 return status;