diff --git a/src/maat_compile.c b/src/maat_compile.c
index 3744534..a58f56e 100644
--- a/src/maat_compile.c
+++ b/src/maat_compile.c
@@ -134,7 +134,6 @@ struct maat_clause_state {
 struct compile_sort_para {
 	int declared_clause_num;
 	long long compile_id;
-	void *user;
 };
 
 #define MAAT_COMPILE_MAGIC	0x4a5b6c7d
@@ -2095,12 +2094,10 @@ static int compile_sort_para_compare(const struct compile_sort_para *a,
 }
 
 static void compile_sort_para_set(struct compile_sort_para *para, 
-                                  const struct compile_rule *compile_relation,
-                                  void *user)
+                                  const struct compile_rule *rule)
 {
-	para->compile_id = compile_relation->compile_id;
-	para->declared_clause_num = compile_relation->declared_clause_num;
-	para->user = user;
+	para->compile_id = rule->compile_id;
+	para->declared_clause_num = rule->declared_clause_num;
 }
 
 static int compare_compile_rule(const void *a, const void *b)
@@ -2109,8 +2106,8 @@ static int compare_compile_rule(const void *a, const void *b)
 	const struct compile_rule *rb = *(const struct compile_rule **)b;
 	
 	struct compile_sort_para sa, sb;
-	compile_sort_para_set(&sa, ra, NULL);
-	compile_sort_para_set(&sb, rb, NULL);
+	compile_sort_para_set(&sa, ra);
+	compile_sort_para_set(&sb, rb);
 
 	return compile_sort_para_compare(&sa, &sb);
 }
diff --git a/src/maat_virtual.c b/src/maat_virtual.c
index 56c0848..a4ce24f 100644
--- a/src/maat_virtual.c
+++ b/src/maat_virtual.c
@@ -20,8 +20,8 @@
 #define MODULE_VIRTUAL	 module_name_str("maat.virtual")
 
 struct virtual_schema {
-    char physical_table[NAME_MAX];
-    int table_id;
+    int vtable_id;
+    int physical_table_id;
     struct table_manager *ref_tbl_mgr;
 };
 
@@ -38,7 +38,7 @@ void *virtual_schema_new(cJSON *json, struct table_manager *tbl_mgr,
                   __FUNCTION__, __LINE__, table_name);
         goto error;
     }
-    schema->table_id = item->valueint;
+    schema->vtable_id = item->valueint;
 
     item = cJSON_GetObjectItem(json, "physical_table");
     if (NULL == item || item->type != cJSON_String) {
@@ -48,7 +48,13 @@ void *virtual_schema_new(cJSON *json, struct table_manager *tbl_mgr,
         goto error;
     }
 
-    memcpy(schema->physical_table, item->valuestring, strlen(item->valuestring));
+    schema->physical_table_id = table_manager_get_table_id(tbl_mgr, item->valuestring);
+    if (schema->physical_table_id < 0) {
+        log_error(logger, MODULE_VIRTUAL, 
+                  "[%s:%d] virtual table:<%s>'s physical table:<%s> unregistered.", 
+                  __FUNCTION__, __LINE__, table_name, item->valuestring);
+        goto error;
+    }
    
     return schema;
 error:
@@ -69,5 +75,5 @@ int virtual_table_get_physical_table_id(void *virtual_schema)
 
     struct virtual_schema *schema = (struct virtual_schema *)virtual_schema;
 
-    return table_manager_get_table_id(schema->ref_tbl_mgr, schema->physical_table);
+    return schema->physical_table_id;
 }
\ No newline at end of file