diff --git a/src/query/inc/sql.y b/src/query/inc/sql.y
index 5b6b930e85b6fc2eb6dcfa483ef190d48bed23f9..1b08f1e2447ecd2f9d7b0d60673e1786185f763d 100644
--- a/src/query/inc/sql.y
+++ b/src/query/inc/sql.y
@@ -303,11 +303,12 @@ alter_db_optr(Y) ::= alter_db_optr(Z) quorum(X).      { Y = Z; Y.quorum = strtol
 alter_db_optr(Y) ::= alter_db_optr(Z) keep(X).        { Y = Z; Y.keep = X; }
 alter_db_optr(Y) ::= alter_db_optr(Z) blocks(X).      { Y = Z; Y.numOfBlocks = strtol(X.z, NULL, 10); }
 alter_db_optr(Y) ::= alter_db_optr(Z) comp(X).        { Y = Z; Y.compressionLevel = strtol(X.z, NULL, 10); }
-alter_db_optr(Y) ::= alter_db_optr(Z) wal(X).         { Y = Z; Y.walLevel = strtol(X.z, NULL, 10); }
 alter_db_optr(Y) ::= alter_db_optr(Z) fsync(X).       { Y = Z; Y.fsyncPeriod = strtol(X.z, NULL, 10); }
 alter_db_optr(Y) ::= alter_db_optr(Z) update(X).      { Y = Z; Y.update = strtol(X.z, NULL, 10); }
 alter_db_optr(Y) ::= alter_db_optr(Z) cachelast(X).   { Y = Z; Y.cachelast = strtol(X.z, NULL, 10); }
 
+//alter_db_optr(Y) ::= alter_db_optr(Z) wal(X).         { Y = Z; Y.walLevel = strtol(X.z, NULL, 10); } not support yet
+
 %type alter_topic_optr {SCreateDbInfo}
 
 alter_topic_optr(Y) ::= alter_db_optr(Z).                       { Y = Z; Y.dbType = TSDB_DB_TYPE_TOPIC; }