diff --git a/core/src/db/DBImpl.cpp b/core/src/db/DBImpl.cpp
index 88689857ca93fd1cbe6de5145a3316288a4fd635..0f118e98dffd6f36e65a140cb787a4bf0a3fd32d 100644
--- a/core/src/db/DBImpl.cpp
+++ b/core/src/db/DBImpl.cpp
@@ -800,7 +800,7 @@ DBImpl::BackgroundCompaction(std::set<std::string> table_ids) {
     {
         uint64_t ttl = 10 * meta::SECOND;  // default: file will be hard-deleted few seconds after soft-deleted
         if (options_.mode_ == DBOptions::MODE::CLUSTER_WRITABLE) {
-            ttl = meta::H_SEC;
+            ttl = meta::HOUR;
         }
 
         meta_ptr_->CleanUpFilesWithTTL(ttl, &ongoing_files_checker_);
diff --git a/core/src/db/meta/MetaConsts.h b/core/src/db/meta/MetaConsts.h
index 0c77dc259945ebd8eb830d327444d00af098b22d..b85c69370774a61dd8928ea97684ec2d08f8cd58 100644
--- a/core/src/db/meta/MetaConsts.h
+++ b/core/src/db/meta/MetaConsts.h
@@ -27,10 +27,10 @@ const size_t US_PS = 1000 * MS_PS;
 const size_t NS_PS = 1000 * US_PS;
 
 const size_t SECOND = 1UL;
-const size_t M_SEC = 60 * SECOND;
-const size_t H_SEC = 60 * M_SEC;
-const size_t D_SEC = 24 * H_SEC;
-const size_t W_SEC = 7 * D_SEC;
+const size_t MINUTE = 60 * SECOND;
+const size_t HOUR = 60 * MINUTE;
+const size_t DAY = 24 * HOUR;
+const size_t WEEK = 7 * DAY;
 
 // This value is to ignore small raw files when building index.
 // The reason is:
diff --git a/core/src/db/meta/MySQLMetaImpl.cpp b/core/src/db/meta/MySQLMetaImpl.cpp
index d4b5eee442f5ca5d48bcf58dd8191a4dbd45efe5..5072df9cad346a34fe1e1364eb5158b498af5976 100644
--- a/core/src/db/meta/MySQLMetaImpl.cpp
+++ b/core/src/db/meta/MySQLMetaImpl.cpp
@@ -1664,7 +1664,7 @@ MySQLMetaImpl::Archive() {
         auto& criteria = kv.first;
         auto& limit = kv.second;
         if (criteria == engine::ARCHIVE_CONF_DAYS) {
-            size_t usecs = limit * D_SEC * US_PS;
+            size_t usecs = limit * DAY * US_PS;
             int64_t now = utils::GetMicroSecTimeStamp();
 
             try {
diff --git a/core/unittest/db/test_meta.cpp b/core/unittest/db/test_meta.cpp
index b89c73c29675b2c359210fda126e140e5989fbcd..bb8641fac59185713263393b2585fba7a78234bb 100644
--- a/core/unittest/db/test_meta.cpp
+++ b/core/unittest/db/test_meta.cpp
@@ -141,7 +141,7 @@ TEST_F(MetaTest, ARCHIVE_TEST_DAYS) {
         status = impl.CreateTableFile(table_file);
         table_file.file_type_ = milvus::engine::meta::TableFileSchema::NEW;
         int day = rand_r(&seed) % (days_num * 2);
-        table_file.created_on_ = ts - day * milvus::engine::meta::D_SEC * milvus::engine::meta::US_PS - 10000;
+        table_file.created_on_ = ts - day * milvus::engine::meta::DAY * milvus::engine::meta::US_PS - 10000;
         status = impl.UpdateTableFile(table_file);
         files.push_back(table_file);
         days.push_back(day);
diff --git a/core/unittest/db/test_meta_mysql.cpp b/core/unittest/db/test_meta_mysql.cpp
index 9a52a01b7bad36eeaef1afdaa4ee1129b3dc2462..f77defe2f699c7fe261416b084f0160559e92650 100644
--- a/core/unittest/db/test_meta_mysql.cpp
+++ b/core/unittest/db/test_meta_mysql.cpp
@@ -145,7 +145,7 @@ TEST_F(MySqlMetaTest, ARCHIVE_TEST_DAYS) {
         status = impl.CreateTableFile(table_file);
         table_file.file_type_ = milvus::engine::meta::TableFileSchema::NEW;
         int day = rand_r(&seed) % (days_num * 2);
-        table_file.created_on_ = ts - day * milvus::engine::meta::D_SEC * milvus::engine::meta::US_PS - 10000;
+        table_file.created_on_ = ts - day * milvus::engine::meta::DAY * milvus::engine::meta::US_PS - 10000;
         status = impl.UpdateTableFile(table_file);
         files.push_back(table_file);
         days.push_back(day);