diff --git a/pkg/utils/util.go b/pkg/utils/util.go
index 08ed222824..408d93227c 100644
--- a/pkg/utils/util.go
+++ b/pkg/utils/util.go
@@ -85,9 +85,6 @@ var (
 		"^RENAME\\s+USER",
 		"^DROP\\s+USER",
 		"^SET\\s+PASSWORD",
-
-		// alter database
-		"^ALTER DATABASE",
 	}
 	builtInSkipDDLPatterns *regexp.Regexp
 )
diff --git a/syncer/filter_test.go b/syncer/filter_test.go
index 01894ebde1..1a6bc3b1b7 100644
--- a/syncer/filter_test.go
+++ b/syncer/filter_test.go
@@ -102,10 +102,6 @@ END`, true},
 		{"drop user t1", true},
 		{"GRANT ALL PRIVILEGES ON *.* TO 't2'@'%' IDENTIFIED WITH 'mysql_native_password' AS '*12033B78389744F3F39AC4CE4CCFCAD6960D8EA0'", true},
 		{"revoke reload on *.* from 't2'@'%'", true},
-
-		// alter database
-		{"alter database foo character set = utf8", true},
-		{"alter database foo collate=utf8_bin", true},
 	}
 
 	//filter, err := bf.NewBinlogEvent(nil)
diff --git a/tests/all_mode/data/db1.increment.sql b/tests/all_mode/data/db1.increment.sql
index 1495d6da5c..af79466640 100644
--- a/tests/all_mode/data/db1.increment.sql
+++ b/tests/all_mode/data/db1.increment.sql
@@ -24,6 +24,9 @@ update t1 set name = 'gentestxxxxxx' where gen_id = 124;
 -- delete with unique key
 delete from t1 where gen_id > 124;
 
+-- test alter database
+alter database all_mode CHARACTER SET = utf8mb4;
+
 -- test decimal type
 alter table t1 add column lat decimal(9,6) default '0.000000';
 insert into t1 (id, name, info, lat) values (8, 'gentest', '{"id":127}', '123.123')