diff --git a/internal/bootstrap/data/setting.go b/internal/bootstrap/data/setting.go
index a4c09c0a..da38d59d 100644
--- a/internal/bootstrap/data/setting.go
+++ b/internal/bootstrap/data/setting.go
@@ -123,12 +123,12 @@ func InitialSettings() []model.SettingItem {
 			Type: conf.TypeText, Group: model.GLOBAL, Flag: model.PRIVATE},
 		{Key: conf.OcrApi, Value: "https://api.nn.ci/ocr/file/json", Type: conf.TypeString, Group: model.GLOBAL},
 		{Key: conf.FilenameCharMapping, Value: `{"/": "|"}`, Type: conf.TypeText, Group: model.GLOBAL},
-		{Key: conf.SearchIndex, Value: "none", Type: conf.TypeSelect, Options: "database,bleve,none", Group: model.GLOBAL},
 		// aria2 settings
 		{Key: conf.Aria2Uri, Value: "http://localhost:6800/jsonrpc", Type: conf.TypeString, Group: model.ARIA2, Flag: model.PRIVATE},
 		{Key: conf.Aria2Secret, Value: "", Type: conf.TypeString, Group: model.ARIA2, Flag: model.PRIVATE},
 		// single settings
 		{Key: conf.Token, Value: token, Type: conf.TypeString, Group: model.SINGLE, Flag: model.PRIVATE},
+		{Key: conf.SearchIndex, Value: "none", Type: conf.TypeSelect, Options: "database,bleve,none", Group: model.SINGLE},
 		{Key: conf.IndexProgress, Value: "{}", Type: conf.TypeText, Group: model.SINGLE, Flag: model.PRIVATE},
 	}
 	if flags.Dev {
diff --git a/internal/db/settingitem.go b/internal/db/settingitem.go
index da8b102b..6cb88b40 100644
--- a/internal/db/settingitem.go
+++ b/internal/db/settingitem.go
@@ -4,44 +4,43 @@ import (
 	"fmt"
 
 	"github.com/alist-org/alist/v3/internal/model"
+	"github.com/alist-org/alist/v3/pkg/generic_sync"
 	"github.com/pkg/errors"
 	log "github.com/sirupsen/logrus"
 )
 
-var settingsMap map[string]string
-var publicSettingsMap map[string]string
+var settingsMap generic_sync.MapOf[string, string]
+var publicSettingsMap generic_sync.MapOf[string, string]
 
 func settingsUpdate() {
-	settingsMap = nil
-	publicSettingsMap = nil
+	settingsMap.Clear()
+	publicSettingsMap.Clear()
 }
 
 func GetPublicSettingsMap() map[string]string {
-	if publicSettingsMap == nil {
-		publicSettingsMap = make(map[string]string)
+	if publicSettingsMap.Empty() {
 		settingItems, err := GetPublicSettingItems()
 		if err != nil {
 			log.Errorf("failed to get settingItems: %+v", err)
 		}
 		for _, settingItem := range settingItems {
-			publicSettingsMap[settingItem.Key] = settingItem.Value
+			publicSettingsMap.Store(settingItem.Key, settingItem.Value)
 		}
 	}
-	return publicSettingsMap
+	return publicSettingsMap.ToMap()
 }
 
-func GetSettingsMap() map[string]string {
-	if settingsMap == nil {
-		settingsMap = make(map[string]string)
+func GetSettingsMap() *generic_sync.MapOf[string, string] {
+	if settingsMap.Empty() {
 		settingItems, err := GetSettingItems()
 		if err != nil {
 			log.Errorf("failed to get settingItems: %+v", err)
 		}
 		for _, settingItem := range settingItems {
-			settingsMap[settingItem.Key] = settingItem.Value
+			settingsMap.Store(settingItem.Key, settingItem.Value)
 		}
 	}
-	return settingsMap
+	return &settingsMap
 }
 
 func GetSettingItems() ([]model.SettingItem, error) {
diff --git a/internal/setting/setting.go b/internal/setting/setting.go
index 5cfd3e2d..2861380a 100644
--- a/internal/setting/setting.go
+++ b/internal/setting/setting.go
@@ -7,7 +7,7 @@ import (
 )
 
 func GetStr(key string, defaultValue ...string) string {
-	val, ok := db.GetSettingsMap()[key]
+	val, ok := db.GetSettingsMap().Load(key)
 	if !ok {
 		if len(defaultValue) > 0 {
 			return defaultValue[0]
diff --git a/pkg/generic_sync/map.go b/pkg/generic_sync/map.go
index c7be9719..b963602c 100644
--- a/pkg/generic_sync/map.go
+++ b/pkg/generic_sync/map.go
@@ -347,6 +347,23 @@ func (m *MapOf[K, V]) Values() []V {
 	return values
 }
 
+func (m *MapOf[K, V]) Count() int {
+	return len(m.dirty)
+}
+
+func (m *MapOf[K, V]) Empty() bool {
+	return m.Count() == 0
+}
+
+func (m *MapOf[K, V]) ToMap() map[K]V {
+	ans := make(map[K]V)
+	m.Range(func(key K, value V) bool {
+		ans[key] = value
+		return true
+	})
+	return ans
+}
+
 func (m *MapOf[K, V]) Clear() {
 	m.Range(func(key K, value V) bool {
 		m.Delete(key)