diff --git a/br/pkg/lightning/restore/tidb.go b/br/pkg/lightning/restore/tidb.go
index 9cf278a67d1cc..f44691b601df3 100644
--- a/br/pkg/lightning/restore/tidb.go
+++ b/br/pkg/lightning/restore/tidb.go
@@ -195,7 +195,7 @@ func createIfNotExistsStmt(p *parser.Parser, createTable, dbName, tblName string
 	for _, stmt := range stmts {
 		switch node := stmt.(type) {
 		case *ast.CreateDatabaseStmt:
-			node.Name = dbName
+			node.Name = model.NewCIStr(dbName)
 			node.IfNotExists = true
 		case *ast.CreateTableStmt:
 			node.Table.Schema = model.NewCIStr(dbName)
diff --git a/ddl/ddl_api.go b/ddl/ddl_api.go
index 93bdaad56a0c4..0105ef79f7d0b 100644
--- a/ddl/ddl_api.go
+++ b/ddl/ddl_api.go
@@ -158,7 +158,7 @@ func (d *ddl) ModifySchemaCharsetAndCollate(ctx sessionctx.Context, stmt *ast.Al
 	}
 
 	// Check if need to change charset/collation.
-	dbName := model.NewCIStr(stmt.Name)
+	dbName := stmt.Name
 	is := d.GetInfoSchemaWithInterceptor(ctx)
 	dbInfo, ok := is.SchemaByName(dbName)
 	if !ok {
@@ -181,7 +181,7 @@ func (d *ddl) ModifySchemaCharsetAndCollate(ctx sessionctx.Context, stmt *ast.Al
 }
 
 func (d *ddl) ModifySchemaDefaultPlacement(ctx sessionctx.Context, stmt *ast.AlterDatabaseStmt, placementPolicyRef *model.PolicyRefInfo) (err error) {
-	dbName := model.NewCIStr(stmt.Name)
+	dbName := stmt.Name
 	is := d.GetInfoSchemaWithInterceptor(ctx)
 	dbInfo, ok := is.SchemaByName(dbName)
 	if !ok {
@@ -276,7 +276,7 @@ func (d *ddl) waitPendingTableThreshold(sctx sessionctx.Context, schemaID int64,
 }
 
 func (d *ddl) ModifySchemaSetTiFlashReplica(sctx sessionctx.Context, stmt *ast.AlterDatabaseStmt, tiflashReplica *ast.TiFlashReplicaSpec) error {
-	dbName := model.NewCIStr(stmt.Name)
+	dbName := stmt.Name
 	is := d.GetInfoSchemaWithInterceptor(sctx)
 	dbInfo, ok := is.SchemaByName(dbName)
 	if !ok {
diff --git a/executor/ddl.go b/executor/ddl.go
index f77091b5a399b..af8742fb1f901 100644
--- a/executor/ddl.go
+++ b/executor/ddl.go
@@ -306,7 +306,7 @@ func (e *DDLExec) executeCreateDatabase(s *ast.CreateDatabaseStmt) error {
 
 	}
 
-	err = domain.GetDomain(e.ctx).DDL().CreateSchema(e.ctx, model.NewCIStr(s.Name), opt, placementPolicyRef)
+	err = domain.GetDomain(e.ctx).DDL().CreateSchema(e.ctx, s.Name, opt, placementPolicyRef)
 	if err != nil {
 		if infoschema.ErrDatabaseExists.Equal(err) && s.IfNotExists {
 			err = nil
@@ -375,7 +375,7 @@ func (e *DDLExec) executeCreateIndex(s *ast.CreateIndexStmt) error {
 }
 
 func (e *DDLExec) executeDropDatabase(s *ast.DropDatabaseStmt) error {
-	dbName := model.NewCIStr(s.Name)
+	dbName := s.Name
 
 	// Protect important system table from been dropped by a mistake.
 	// I can hardly find a case that a user really need to do this.
diff --git a/parser/ast/ddl.go b/parser/ast/ddl.go
index 54b2734b8fde5..8ac6f0152749e 100644
--- a/parser/ast/ddl.go
+++ b/parser/ast/ddl.go
@@ -132,7 +132,7 @@ type CreateDatabaseStmt struct {
 	ddlNode
 
 	IfNotExists bool
-	Name        string
+	Name        model.CIStr
 	Options     []*DatabaseOption
 }
 
@@ -142,7 +142,7 @@ func (n *CreateDatabaseStmt) Restore(ctx *format.RestoreCtx) error {
 	if n.IfNotExists {
 		ctx.WriteKeyWord("IF NOT EXISTS ")
 	}
-	ctx.WriteName(n.Name)
+	ctx.WriteName(n.Name.O)
 	for i, option := range n.Options {
 		ctx.WritePlain(" ")
 		err := option.Restore(ctx)
@@ -168,7 +168,7 @@ func (n *CreateDatabaseStmt) Accept(v Visitor) (Node, bool) {
 type AlterDatabaseStmt struct {
 	ddlNode
 
-	Name                 string
+	Name                 model.CIStr
 	AlterDefaultDatabase bool
 	Options              []*DatabaseOption
 }
@@ -191,7 +191,7 @@ func (n *AlterDatabaseStmt) Restore(ctx *format.RestoreCtx) error {
 	ctx.WriteKeyWord("ALTER DATABASE")
 	if !n.AlterDefaultDatabase {
 		ctx.WritePlain(" ")
-		ctx.WriteName(n.Name)
+		ctx.WriteName(n.Name.O)
 	}
 	for i, option := range n.Options {
 		ctx.WritePlain(" ")
@@ -230,7 +230,7 @@ type DropDatabaseStmt struct {
 	ddlNode
 
 	IfExists bool
-	Name     string
+	Name     model.CIStr
 }
 
 // Restore implements Node interface.
@@ -239,7 +239,7 @@ func (n *DropDatabaseStmt) Restore(ctx *format.RestoreCtx) error {
 	if n.IfExists {
 		ctx.WriteKeyWord("IF EXISTS ")
 	}
-	ctx.WriteName(n.Name)
+	ctx.WriteName(n.Name.O)
 	return nil
 }
 
diff --git a/parser/parser.go b/parser/parser.go
index 6263a9718444b..051b5550596c1 100644
--- a/parser/parser.go
+++ b/parser/parser.go
@@ -13251,7 +13251,7 @@ yynewstate:
 	case 330:
 		{
 			parser.yyVAL.statement = &ast.AlterDatabaseStmt{
-				Name:                 yyS[yypt-1].ident,
+				Name:                 model.NewCIStr(yyS[yypt-1].ident),
 				AlterDefaultDatabase: false,
 				Options:              yyS[yypt-0].item.([]*ast.DatabaseOption),
 			}
@@ -13259,7 +13259,7 @@ yynewstate:
 	case 331:
 		{
 			parser.yyVAL.statement = &ast.AlterDatabaseStmt{
-				Name:                 "",
+				Name:                 model.NewCIStr(""),
 				AlterDefaultDatabase: true,
 				Options:              yyS[yypt-0].item.([]*ast.DatabaseOption),
 			}
@@ -13268,7 +13268,7 @@ yynewstate:
 		{
 			parser.yyVAL.statement = &ast.CreateDatabaseStmt{
 				IfNotExists: yyS[yypt-2].item.(bool),
-				Name:        yyS[yypt-1].ident,
+				Name:        model.NewCIStr(yyS[yypt-1].ident),
 				Options:     yyS[yypt-0].item.([]*ast.DatabaseOption),
 			}
 		}
@@ -13915,7 +13915,7 @@ yynewstate:
 		}
 	case 449:
 		{
-			parser.yyVAL.statement = &ast.DropDatabaseStmt{IfExists: yyS[yypt-1].item.(bool), Name: yyS[yypt-0].ident}
+			parser.yyVAL.statement = &ast.DropDatabaseStmt{IfExists: yyS[yypt-1].item.(bool), Name: model.NewCIStr(yyS[yypt-0].ident)}
 		}
 	case 450:
 		{
diff --git a/parser/parser.y b/parser/parser.y
index 465a2c69101aa..131fa55aaaebd 100644
--- a/parser/parser.y
+++ b/parser/parser.y
@@ -3655,7 +3655,7 @@ AlterDatabaseStmt:
 	"ALTER" DatabaseSym DBName DatabaseOptionList
 	{
 		$$ = &ast.AlterDatabaseStmt{
-			Name:                 $3,
+			Name:                 model.NewCIStr($3),
 			AlterDefaultDatabase: false,
 			Options:              $4.([]*ast.DatabaseOption),
 		}
@@ -3663,7 +3663,7 @@ AlterDatabaseStmt:
 |	"ALTER" DatabaseSym DatabaseOptionList
 	{
 		$$ = &ast.AlterDatabaseStmt{
-			Name:                 "",
+			Name:                 model.NewCIStr(""),
 			AlterDefaultDatabase: true,
 			Options:              $3.([]*ast.DatabaseOption),
 		}
@@ -3685,7 +3685,7 @@ CreateDatabaseStmt:
 	{
 		$$ = &ast.CreateDatabaseStmt{
 			IfNotExists: $3.(bool),
-			Name:        $4,
+			Name:        model.NewCIStr($4),
 			Options:     $5.([]*ast.DatabaseOption),
 		}
 	}
@@ -4463,7 +4463,7 @@ DatabaseSym:
 DropDatabaseStmt:
 	"DROP" DatabaseSym IfExists DBName
 	{
-		$$ = &ast.DropDatabaseStmt{IfExists: $3.(bool), Name: $4}
+		$$ = &ast.DropDatabaseStmt{IfExists: $3.(bool), Name: model.NewCIStr($4)}
 	}
 
 /******************************************************************
diff --git a/planner/core/planbuilder.go b/planner/core/planbuilder.go
index ad8388f15a8f4..b150788d36a56 100644
--- a/planner/core/planbuilder.go
+++ b/planner/core/planbuilder.go
@@ -4159,16 +4159,16 @@ func (b *PlanBuilder) buildDDL(ctx context.Context, node ast.DDLNode) (Plan, err
 	switch v := node.(type) {
 	case *ast.AlterDatabaseStmt:
 		if v.AlterDefaultDatabase {
-			v.Name = b.ctx.GetSessionVars().CurrentDB
+			v.Name = model.NewCIStr(b.ctx.GetSessionVars().CurrentDB)
 		}
-		if v.Name == "" {
+		if v.Name.O == "" {
 			return nil, ErrNoDB
 		}
 		if b.ctx.GetSessionVars().User != nil {
 			authErr = ErrDBaccessDenied.GenWithStackByArgs("ALTER", b.ctx.GetSessionVars().User.AuthUsername,
 				b.ctx.GetSessionVars().User.AuthHostname, v.Name)
 		}
-		b.visitInfo = appendVisitInfo(b.visitInfo, mysql.AlterPriv, v.Name, "", "", authErr)
+		b.visitInfo = appendVisitInfo(b.visitInfo, mysql.AlterPriv, v.Name.L, "", "", authErr)
 	case *ast.AlterTableStmt:
 		if b.ctx.GetSessionVars().User != nil {
 			authErr = ErrTableaccessDenied.GenWithStackByArgs("ALTER", b.ctx.GetSessionVars().User.AuthUsername,
@@ -4246,7 +4246,7 @@ func (b *PlanBuilder) buildDDL(ctx context.Context, node ast.DDLNode) (Plan, err
 			authErr = ErrDBaccessDenied.GenWithStackByArgs(b.ctx.GetSessionVars().User.AuthUsername,
 				b.ctx.GetSessionVars().User.AuthHostname, v.Name)
 		}
-		b.visitInfo = appendVisitInfo(b.visitInfo, mysql.CreatePriv, v.Name,
+		b.visitInfo = appendVisitInfo(b.visitInfo, mysql.CreatePriv, v.Name.L,
 			"", "", authErr)
 	case *ast.CreateIndexStmt:
 		if b.ctx.GetSessionVars().User != nil {
@@ -4340,7 +4340,7 @@ func (b *PlanBuilder) buildDDL(ctx context.Context, node ast.DDLNode) (Plan, err
 			authErr = ErrDBaccessDenied.GenWithStackByArgs(b.ctx.GetSessionVars().User.AuthUsername,
 				b.ctx.GetSessionVars().User.AuthHostname, v.Name)
 		}
-		b.visitInfo = appendVisitInfo(b.visitInfo, mysql.DropPriv, v.Name,
+		b.visitInfo = appendVisitInfo(b.visitInfo, mysql.DropPriv, v.Name.L,
 			"", "", authErr)
 	case *ast.DropIndexStmt:
 		if b.ctx.GetSessionVars().User != nil {
diff --git a/planner/core/preprocess.go b/planner/core/preprocess.go
index 5324eaf4de769..3d55d3f6c14d2 100644
--- a/planner/core/preprocess.go
+++ b/planner/core/preprocess.go
@@ -716,20 +716,20 @@ func (p *preprocessor) checkSetOprSelectList(stmt *ast.SetOprSelectList) {
 }
 
 func (p *preprocessor) checkCreateDatabaseGrammar(stmt *ast.CreateDatabaseStmt) {
-	if isIncorrectName(stmt.Name) {
+	if isIncorrectName(stmt.Name.L) {
 		p.err = dbterror.ErrWrongDBName.GenWithStackByArgs(stmt.Name)
 	}
 }
 
 func (p *preprocessor) checkAlterDatabaseGrammar(stmt *ast.AlterDatabaseStmt) {
 	// for 'ALTER DATABASE' statement, database name can be empty to alter default database.
-	if isIncorrectName(stmt.Name) && !stmt.AlterDefaultDatabase {
+	if isIncorrectName(stmt.Name.L) && !stmt.AlterDefaultDatabase {
 		p.err = dbterror.ErrWrongDBName.GenWithStackByArgs(stmt.Name)
 	}
 }
 
 func (p *preprocessor) checkDropDatabaseGrammar(stmt *ast.DropDatabaseStmt) {
-	if isIncorrectName(stmt.Name) {
+	if isIncorrectName(stmt.Name.L) {
 		p.err = dbterror.ErrWrongDBName.GenWithStackByArgs(stmt.Name)
 	}
 }