diff --git a/CHANGELOG.md b/CHANGELOG.md
index f5f9725825..98fa8a7f97 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@ Please mark all change in change log and use the ticket from JIRA.
 # Milvus 0.5.2 (TODO)
 
 ## Bug
+- \#194 - Search faild: message="Table file doesn't exist"
 
 ## Feature
 
diff --git a/core/src/db/meta/MySQLMetaImpl.cpp b/core/src/db/meta/MySQLMetaImpl.cpp
index 44594636ad..4eafd6b9ec 100644
--- a/core/src/db/meta/MySQLMetaImpl.cpp
+++ b/core/src/db/meta/MySQLMetaImpl.cpp
@@ -173,6 +173,7 @@ MySQLMetaImpl::~MySQLMetaImpl() {
 
 Status
 MySQLMetaImpl::NextTableId(std::string& table_id) {
+    std::lock_guard<std::mutex> lock(genid_mutex_); // avoid duplicated id
     std::stringstream ss;
     SimpleIDGenerator g;
     ss << g.GetNextIDNumber();
@@ -182,6 +183,7 @@ MySQLMetaImpl::NextTableId(std::string& table_id) {
 
 Status
 MySQLMetaImpl::NextFileId(std::string& file_id) {
+    std::lock_guard<std::mutex> lock(genid_mutex_); // avoid duplicated id
     std::stringstream ss;
     SimpleIDGenerator g;
     ss << g.GetNextIDNumber();
diff --git a/core/src/db/meta/MySQLMetaImpl.h b/core/src/db/meta/MySQLMetaImpl.h
index 02bc6e1752..bb7fb5b59f 100644
--- a/core/src/db/meta/MySQLMetaImpl.h
+++ b/core/src/db/meta/MySQLMetaImpl.h
@@ -136,6 +136,7 @@ class MySQLMetaImpl : public Meta {
     std::shared_ptr<MySQLConnectionPool> mysql_connection_pool_;
     bool safe_grab_ = false;
 
+    std::mutex genid_mutex_;
     //        std::mutex connectionMutex_;
 };  // DBMetaImpl
 
diff --git a/core/src/db/meta/SqliteMetaImpl.cpp b/core/src/db/meta/SqliteMetaImpl.cpp
index 3fed2a81d4..0454123acd 100644
--- a/core/src/db/meta/SqliteMetaImpl.cpp
+++ b/core/src/db/meta/SqliteMetaImpl.cpp
@@ -97,6 +97,7 @@ SqliteMetaImpl::~SqliteMetaImpl() {
 
 Status
 SqliteMetaImpl::NextTableId(std::string &table_id) {
+    std::lock_guard<std::mutex> lock(genid_mutex_); // avoid duplicated id
     std::stringstream ss;
     SimpleIDGenerator g;
     ss << g.GetNextIDNumber();
@@ -106,6 +107,7 @@ SqliteMetaImpl::NextTableId(std::string &table_id) {
 
 Status
 SqliteMetaImpl::NextFileId(std::string &file_id) {
+    std::lock_guard<std::mutex> lock(genid_mutex_); // avoid duplicated id
     std::stringstream ss;
     SimpleIDGenerator g;
     ss << g.GetNextIDNumber();
diff --git a/core/src/db/meta/SqliteMetaImpl.h b/core/src/db/meta/SqliteMetaImpl.h
index c8b99b358a..0fc3f3c4ba 100644
--- a/core/src/db/meta/SqliteMetaImpl.h
+++ b/core/src/db/meta/SqliteMetaImpl.h
@@ -132,6 +132,7 @@ class SqliteMetaImpl : public Meta {
  private:
     const DBMetaOptions options_;
     std::mutex meta_mutex_;
+    std::mutex genid_mutex_;
 };  // DBMetaImpl
 
 }  // namespace meta