diff --git a/src/loader/DDBHFTLoader.py b/src/loader/DDBHFTLoader.py
index c14f786..cbd77ce 100644
--- a/src/loader/DDBHFTLoader.py
+++ b/src/loader/DDBHFTLoader.py
@@ -394,6 +394,7 @@ class DDBHFTLoader(DDBLoader):
             row_list = [row for row in row_list 
                     if pd.to_datetime(row[1]) not in _journal_dt.index]
             print(f"Resume job for {stock_id}, with {len(row_list)} rows left.")
+            del(_journal_dt)
 
         num_rows = len(row_list)
         # 如果行数为0，则说明是空数据，可以直接返回
@@ -426,6 +427,7 @@ class DDBHFTLoader(DDBLoader):
             ):
                 sub_pbar.update()
 
+        del(row_list)
         self.dump_journal_writer.write(f"{type_name},{stock_id},OK\n")
         self.dump_journal_writer.flush()
 
@@ -477,8 +479,8 @@ class DDBHFTLoader(DDBLoader):
 
         ddb_sess.upload({df_table_name : df})
         # 因为在做Tick数据的时候，偶然发生'CHUNK[xxx] does not exist.'，所以在这里使用`append!`函数代换一下试试
-        ddb_sess.run("append!(loadTable('{dbPath}', `{partitioned_table_name}), {df_table_name})".format(
-        #ddb_sess.run("tableInsert(loadTable('{dbPath}', `{partitioned_table_name}), {df_table_name})".format(
+        #ddb_sess.run("append!(loadTable('{dbPath}', `{partitioned_table_name}), {df_table_name})".format(
+        ddb_sess.run("tableInsert(loadTable('{dbPath}', `{partitioned_table_name}), {df_table_name})".format(
             dbPath = DDBHFTLoader.ddb_path,
             partitioned_table_name = type_name + DDBHFTLoader.ddb_partition_table_suffix,
             df_table_name = df_table_name
@@ -486,5 +488,6 @@ class DDBHFTLoader(DDBLoader):
 
         # 由于不是复用`DDBHFTLoader`对象内部的Session，因此如果不手动关闭就会造成内存逐渐泄漏
         ddb_sess.close()
+        del(df)
 
 
diff --git a/src/loader/DDBPITLoader.py b/src/loader/DDBPITLoader.py
index 95575a6..56719b2 100644
--- a/src/loader/DDBPITLoader.py
+++ b/src/loader/DDBPITLoader.py
@@ -46,6 +46,10 @@ class DDBPITLoader(DDBLoader):
         'AppearAtDate' : ('appear_at_date', 'DATE')
     }
 
+    symbol_col_set = {
+        'S_PROFITNOTICE_STYLE'
+    }
+
     date_col_set = {
         'report_period',
         'appear_in_period',
@@ -136,6 +140,11 @@ class DDBPITLoader(DDBLoader):
                     mssql_col_name_list.append(_col_name)
                     ddb_col_name_list.append(_col_name)
                     ddb_col_type_list.append('DATE')
+                # 需要被转换成SYMBOL的字段
+                elif _col_name in self.symbol_col_set:
+                    mssql_col_name_list.append(_col_name)
+                    ddb_col_name_list.append(_col_name)
+                    ddb_col_type_list.append('SYMBOL')
                 # 按照对照表进行类型转换
                 elif _col_type in self.ddb_type_mapping:
                     mssql_col_name_list.append(_col_name)