update

Former-commit-id: c042d8d46f535eca99b826b755083747ffc9472a

cpp/conf/server_config.template

@@ -15,7 +15,6 @@ db_config:
   index_building_threshold: 1024   # index building trigger threshold, default: 1024, unit: MB
   archive_disk_threshold: 512      # triger archive action if storage size exceed this value, unit: GB
   archive_days_threshold: 30       # files older than x days will be archived, unit: day
-  sql_echo: on                     # print sql statement in debug log
 
 metric_config:
   is_startup: off      # if monitoring start: on, off