diff --git a/tests/script/general/db/alter_option.sim b/tests/script/general/db/alter_option.sim
index c20a96fd1bd18ba911cce02859d7265d0294b76b..36f4c0e7dcfca27f77b0e701adff47e06f9d1bb0 100644
--- a/tests/script/general/db/alter_option.sim
+++ b/tests/script/general/db/alter_option.sim
@@ -198,29 +198,25 @@ if $data12_db != 1 then
   return -1
 endi
 
-sql alter database db wal 1
-sql show databases
-print wal $data12_db
-if $data12_db != 1 then 
-  return -1
-endi
+sql_error alter database db wal 1
+
 
-sql alter database db wal 1
-sql alter database db wal 2
-sql alter database db wal 1
-sql alter database db wal 2
-sql alter database db wal 0
+sql_error alter database db wal 1
+sql_error alter database db wal 2
+sql_error alter database db wal 1
+sql_error alter database db wal 2
+sql_error alter database db wal 0
 sql_error alter database db wal 3
 sql_error alter database db wal 4
 sql_error alter database db wal -1
 sql_error alter database db wal 1000
 
 print ============== step fsync
-sql alter database db fsync 0
-sql alter database db fsync 1
-sql alter database db fsync 3600
-sql alter database db fsync 18000
-sql alter database db fsync 180000
+sql_error alter database db fsync 0
+sql_error alter database db fsync 1
+sql_error alter database db fsync 3600
+sql_error alter database db fsync 18000
+sql_error alter database db fsync 180000
 sql_error alter database db fsync 180001
 sql_error alter database db fsync -1
 
diff --git a/tests/script/general/db/topic1.sim b/tests/script/general/db/topic1.sim
index 4939e5a0e2274e8ab26465fe04ca99a79f9f9ce0..7bef15a80280f99d9361f0b9d84d37072c061f22 100644
--- a/tests/script/general/db/topic1.sim
+++ b/tests/script/general/db/topic1.sim
@@ -495,18 +495,13 @@ if $data12_db != 1 then
 endi
 
 sql_error alter topic db wal 1
-sql alter database db wal 1
-sql show databases
-print wal $data12_db
-if $data12_db != 1 then 
-  return -1
-endi
+sql_error alter database db wal 1
 
-sql alter database db wal 1
-sql alter database db wal 2
-sql alter database db wal 1
-sql alter database db wal 2
-sql alter database db wal 0
+sql_error alter database db wal 1
+sql_error alter database db wal 2
+sql_error alter database db wal 1
+sql_error alter database db wal 2
+sql_error alter database db wal 0
 sql_error alter database db wal 3
 sql_error alter database db wal 4
 sql_error alter database db wal -1
diff --git a/tests/script/general/parser/create_db.sim b/tests/script/general/parser/create_db.sim
index 7881060ad178fe3b3f7a9ea0530a1ac517264a3e..a62a45e0233f5db81bc7565c856f08483c9d8aee 100644
--- a/tests/script/general/parser/create_db.sim
+++ b/tests/script/general/parser/create_db.sim
@@ -237,7 +237,42 @@ sql_error create database $db ctime 29
 sql_error create database $db ctime 40961
 
 # wal {0, 2}
-#sql_error create database $db wal 0
+sql create database testwal wal 0
+sql show databases
+if $rows != 1 then
+  return -1
+endi
+
+sql show databases
+print wallevel $data12_testwal
+if $data12_testwal != 0 then 
+  return -1
+endi
+sql drop database testwal
+
+sql create database testwal wal 1
+sql show databases
+if $rows != 1 then
+  return -1
+endi
+sql show databases
+print wallevel $data12_testwal
+if $data12_testwal != 1 then 
+  return -1
+endi
+sql drop database testwal
+
+sql create database testwal wal 2
+sql show databases
+if $rows != 1 then
+  return -1
+endi
+print wallevel $data12_testwal
+if $data12_testwal != 2 then 
+  return -1
+endi
+sql drop database testwal
+
 sql_error create database $db wal -1
 sql_error create database $db wal 3