diff --git a/frontend/src/api/event.js b/frontend/src/api/event.js
index ebb48422c..354ce9a41 100644
--- a/frontend/src/api/event.js
+++ b/frontend/src/api/event.js
@@ -77,3 +77,10 @@ export const exportSnapshotFromEvent = (data) => {
     data
   })
 }
+
+export const eventFileInfo = () => {
+  return axios({
+    url: '/api/event/fileinfo',
+    method: 'GET'
+  })
+}
diff --git a/frontend/src/store/event.js b/frontend/src/store/event.js
index 2ec0d100a..e81bf817a 100644
--- a/frontend/src/store/event.js
+++ b/frontend/src/store/event.js
@@ -11,7 +11,11 @@ export default {
     selectedEvent: null,
     eventDetail: '',
     page: null,
-    eventSearchStr: ''
+    eventSearchStr: '',
+    eventFilePath: '',
+    eventFileSizeThreshold: '',
+    eventFileSize: '',
+    eventFileOversized: false
   },
   mutations: {
     setChannelNames (state, channelNames) {
@@ -37,6 +41,18 @@ export default {
     },
     setEventSearchStr (state, val) {
       state.eventSearchStr = val
+    },
+    setEventFilePath (state, val) {
+      state.eventFilePath = val
+    },
+    setEventFileSizeThreshold (state, val) {
+      state.eventFileSizeThreshold = val
+    },
+    setEventFileSize (state, val) {
+      state.eventFileSize = val
+    },
+    setEventFileOversized (state, val) {
+      state.eventFileOversized = val
     }
   },
   actions: {
diff --git a/frontend/src/views/event/EventButtonBar.vue b/frontend/src/views/event/EventButtonBar.vue
index 5c5aedb5f..38e1c6ae9 100644
--- a/frontend/src/views/event/EventButtonBar.vue
+++ b/frontend/src/views/event/EventButtonBar.vue
@@ -11,7 +11,26 @@
         <span>Clear</span>
       </v-tooltip>
 
-   
+      <v-tooltip right open-delay=500 v-if=this.eventFileOversized>
+        <template v-slot:activator="{ on, attrs }">
+          <v-btn icon v-bind="attrs" v-on="on">
+            <v-icon size="18px" color="warning">mdi-information-outline</v-icon>
+          </v-btn>
+        </template>
+        <span>Database path: {{ eventFilePath }}</span><br>
+        <span>Database size: {{ eventFileSize }}</span>
+        <b style="white-space:pre">   Please clear</b><v-icon size="18px" color="accent">mdi-eraser</v-icon><b>as soon as possible.</b>
+      </v-tooltip>
+      <v-tooltip right open-delay=500 v-else>
+        <template v-slot:activator="{ on, attrs }">
+          <v-btn icon v-bind="attrs" v-on="on">
+            <v-icon size="18px" color="accent">mdi-information-outline</v-icon>
+          </v-btn>
+        </template>
+        <span>Database path: {{ eventFilePath }}</span><br>
+        <span>Database size: {{ eventFileSize }}</span>
+      </v-tooltip>
+
     </div>
 
     <div class="inline">
@@ -67,6 +86,7 @@
 </template>
 
 <script>
+import { eventFileInfo } from '@/api'
 import Icon from 'vue-svg-icon/Icon.vue'
 
 export default {
@@ -74,6 +94,9 @@ export default {
   components: {
     'svg-icon': Icon
   },
+  activated () {
+    this.checkEventFileInfo()
+  },
   data () {
     return {
       isShowClearDialog: false
@@ -87,9 +110,37 @@ export default {
       set (val) {
         this.$store.commit('setEventSearchStr', val)
       }
+    },
+    eventFilePath() {
+      return this.$store.state.event.eventFilePath
+    },
+    eventFileSize() {
+      return this.$store.state.event.eventFileSize
+    },
+    eventFileOversized() {
+      return this.$store.state.event.eventFileOversized
     }
   },
   methods: {
+    checkEventFileInfo () {
+      eventFileInfo()
+        .then(response => {
+          let eventFileInfo = response.data.file_info
+          let eventFilePath = eventFileInfo.path
+          let eventFileSizeThreshold = eventFileInfo.threshold
+          let eventFileSize = eventFileInfo.size
+          let eventFileOversized = eventFileInfo.oversized
+          if (eventFileOversized) {
+            this.$bus.$emit('msg.info', `Database size has exceeded ${eventFileSizeThreshold}, please clear it as soon!`)
+          }
+          this.$store.commit('setEventFilePath', eventFilePath)
+          this.$store.commit('setEventFileSizeThreshold', eventFileSizeThreshold)
+          this.$store.commit('setEventFileSize', eventFileSize)
+          this.$store.commit('setEventFileOversized', eventFileOversized)
+        }).catch(error => {
+          this.$bus.$emit('msg.error', `Get event file info error: ${error.data.message}`)
+        })
+    },
     clearAllEvents () {
       this.isShowClearDialog = false
       this.$store.dispatch('clearEvents')
diff --git a/lyrebird/db/database_server.py b/lyrebird/db/database_server.py
index 757c97384..9a28cd7f1 100644
--- a/lyrebird/db/database_server.py
+++ b/lyrebird/db/database_server.py
@@ -7,7 +7,7 @@
 from pathlib import Path
 from lyrebird import application
 from lyrebird import log
-from lyrebird.utils import JSONFormat
+from lyrebird.utils import convert_size, convert_size_to_byte, JSONFormat
 from lyrebird.base_server import ThreadServer
 from lyrebird.mock import context
 from sqlalchemy import event, and_
@@ -16,6 +16,7 @@
 from sqlalchemy.ext.declarative import declarative_base
 from sqlalchemy import Column, String, Integer, Text, DateTime, create_engine, Table, MetaData
 from sqlalchemy.orm.attributes import InstrumentedAttribute
+from sqlalchemy.exc import OperationalError
 
 
 """
@@ -141,6 +142,9 @@ def event_receiver(self, event, channel=None, event_id=None):
         flow = Event(event_id=event_id, channel=channel, content=content, message=message)
         self.storage_queue.put(flow)
 
+    def start(self):
+        super().start()
+
     def run(self):
         session = self._scoped_session()
         while self.running:
@@ -149,6 +153,10 @@ def run(self):
                 session.add(event)
                 session.commit()
                 context.emit('db_action', 'add event log')
+            except OperationalError:
+                logger.error(f'Save event failed. {traceback.format_exc()}')
+                logger.warning(f'DB would be reset: {self.database_uri}')
+                self.reset()
             except Exception:
                 logger.error(f'Save event failed. {traceback.format_exc()}')
 
@@ -211,12 +219,28 @@ def get_page_count(self, channel_rules, page_size=20, search_str=''):
         result = query.count()
         self._scoped_session.remove()
         return math.ceil(result / page_size)
+    
+    def get_database_info(self):
+        database_path = str(self.database_uri)
+        threshold_str = application._cm.config.get('event.file_size_threshold')
+        threshold_byte = convert_size_to_byte(threshold_str)
+        size = self.database_uri.stat().st_size
+        readable_size = convert_size(size)
+        oversized = threshold_byte and size > threshold_byte
+        database_info = {
+            'path': database_path,
+            'threshold': threshold_str,
+            'size': readable_size,
+            'oversized': oversized
+        }
+        return database_info
 
     def reset(self):
         self.stop()
         self.database_uri.unlink()
         self.init_engine()
-        # TODO After self.stop() could terminate Thread, change `self.running = True` into self.start()
+        if not self.server_thread.is_alive():
+            self.start()
         self.running = True
 
 
diff --git a/lyrebird/mock/blueprints/apis/__init__.py b/lyrebird/mock/blueprints/apis/__init__.py
index b206caf91..092fd97a5 100644
--- a/lyrebird/mock/blueprints/apis/__init__.py
+++ b/lyrebird/mock/blueprints/apis/__init__.py
@@ -7,7 +7,7 @@
 from .menu import Menu
 from .notice import Notice
 from .checker import Checker
-from .event import Event, EventExport, Channel
+from .event import Event, EventExport, Channel, EventFileInfo
 from .conflict_check import ConflictCheck, ActivatedDataConflictCheck
 from .mock_editor import Cut, Copy, Paste, Duplicate
 from .qrcode import Qrcode
@@ -89,3 +89,4 @@ def after_request(response):
 api_source.add_resource(EventExport, '/event/export', '/event/export/<string:event_id>')
 api_source.add_resource(Channel, '/channel', '/channel/<string:mode>')
 api_source.add_resource(StatusBar, '/statusbar', '/statusbar/<string:item_id>')
+api_source.add_resource(EventFileInfo, '/event/fileinfo')
diff --git a/lyrebird/mock/blueprints/apis/event.py b/lyrebird/mock/blueprints/apis/event.py
index 6c802c663..c0dc2aaf6 100644
--- a/lyrebird/mock/blueprints/apis/event.py
+++ b/lyrebird/mock/blueprints/apis/event.py
@@ -82,3 +82,12 @@ def post(self, event_id=None):
         res.headers['Content-Disposition'] = f'attachment; filename={filename}'
         return res
 
+
+class EventFileInfo(Resource):
+
+    def get(self):
+        db = application.server['db']
+        file_info = dict()
+        if db is not None:
+            file_info = db.get_database_info()
+        return application.make_ok_response(file_info=file_info)
diff --git a/lyrebird/utils.py b/lyrebird/utils.py
index 519caee27..bddf85235 100644
--- a/lyrebird/utils.py
+++ b/lyrebird/utils.py
@@ -29,6 +29,20 @@ def convert_size(size_bytes):
     return "%s %s" % (s, size_name[i])
 
 
+def convert_size_to_byte(size_str):
+    size_str = size_str.strip().upper()
+    match = re.match(r'^(\d+\.?\d*)\s*([KMGTPEZY]?[B])$', size_str)
+    if not match:
+        logger.warning(f'Invalid size string: {size_str}')
+        return
+    size = float(match.group(1))
+    unit = match.group(2)
+    size_name = ("B", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB")
+    i = size_name.index(unit)
+    size_bytes = int(size * (1024 ** i))
+    return size_bytes
+
+
 def convert_time(duration):
     if duration < 1:
         return str(round(duration * 1000)) + 'ms'