diff --git a/tests/system-test/0-others/walRetention.py b/tests/system-test/0-others/walRetention.py
index 2b340b79697f874a1e300970fac74f90529f0cc9..5257b7644a2ec9310ab4133e78cf0bfa8118dbd8 100644
--- a/tests/system-test/0-others/walRetention.py
+++ b/tests/system-test/0-others/walRetention.py
@@ -460,8 +460,7 @@ class TDTestCase:
         #self.test_db("db2", 5, 10*24*3600, 2*1024) # 2M size
         
         # period + size        
-        self.test_db("db", checkTime = 5*60, wal_period = 60, wal_size_kb=10)
-        #self.test_db("db", checkTime = 3*60, wal_period = 0, wal_size_kb=0)
+        self.test_db("db", checkTime = 3*60, wal_period = 60, wal_size_kb=500)
 
 
     def stop(self):
diff --git a/tools/shell/src/shellEngine.c b/tools/shell/src/shellEngine.c
index e9dd067ac49b1dbc3c90b55fc4e75d12faa33ae6..0148ebc3c5f07a79e89e976c47f174874195c170 100644
--- a/tools/shell/src/shellEngine.c
+++ b/tools/shell/src/shellEngine.c
@@ -776,7 +776,7 @@ int32_t shellCalcColWidth(TAOS_FIELD *field, int32_t precision) {
       if (field->bytes > shell.args.displayWidth) {
         return TMAX(shell.args.displayWidth, width);
       } else {
-        return TMAX(field->bytes, width);
+        return TMAX(field->bytes + 2, width);
       }
 
     case TSDB_DATA_TYPE_NCHAR:
@@ -785,7 +785,7 @@ int32_t shellCalcColWidth(TAOS_FIELD *field, int32_t precision) {
       if (bytes > shell.args.displayWidth) {
         return TMAX(shell.args.displayWidth, width);
       } else {
-        return TMAX(bytes, width);
+        return TMAX(bytes + 2, width);
       }
     }