diff --git a/src/storage/backup/ob_backup_utils.cpp b/src/storage/backup/ob_backup_utils.cpp
index 2ec4589bcb..68b3c8828f 100644
--- a/src/storage/backup/ob_backup_utils.cpp
+++ b/src/storage/backup/ob_backup_utils.cpp
@@ -107,6 +107,11 @@ int ObBackupUtils::get_sstables_by_data_type(const storage::ObTabletHandle &tabl
         ret = OB_ERR_UNEXPECTED;
         LOG_WARN("last major sstable should not be null", K(ret), K(tablet_handle));
       }
+    } else if (tablet_handle.get_obj()->get_medium_compaction_info_list().get_last_compaction_scn() > 0
+        && tablet_handle.get_obj()->get_medium_compaction_info_list().get_last_compaction_scn() != last_major_sstable_ptr->get_snapshot_version()) {
+      ret = OB_ERR_UNEXPECTED;
+      LOG_WARN("medium list is invalid for last major sstable", K(ret), "medium_list", tablet_handle.get_obj()->get_medium_compaction_info_list(),
+          KPC(last_major_sstable_ptr), K(tablet_handle));
     } else if (OB_FAIL(sstable_array.push_back(last_major_sstable_ptr))) {
       LOG_WARN("failed to push back", K(ret), KPC(last_major_sstable_ptr));
     }
@@ -1864,7 +1869,7 @@ int ObBackupTabletProvider::hold_tablet_handle_(
 }
 
 int ObBackupTabletProvider::fetch_tablet_sstable_array_(const common::ObTabletID &tablet_id,
-    storage::ObTabletHandle &tablet_handle, const share::ObBackupDataType &backup_data_type,
+    const storage::ObTabletHandle &tablet_handle, const share::ObBackupDataType &backup_data_type,
     common::ObIArray<storage::ObITable *> &sstable_array)
 {
   int ret = OB_SUCCESS;
diff --git a/src/storage/backup/ob_backup_utils.h b/src/storage/backup/ob_backup_utils.h
index 010de1971e..0e61d047b1 100644
--- a/src/storage/backup/ob_backup_utils.h
+++ b/src/storage/backup/ob_backup_utils.h
@@ -275,7 +275,7 @@ private:
       const common::ObTabletID &tablet_id, share::ObBackupSkippedType &skipped_type);
   int report_tablet_skipped_(const common::ObTabletID &tablet_id, const share::ObBackupSkippedType &skipped_type);
   int hold_tablet_handle_(const common::ObTabletID &tablet_id, storage::ObTabletHandle &tablet_handle);
-  int fetch_tablet_sstable_array_(const common::ObTabletID &tablet_id, storage::ObTabletHandle &tablet_handle,
+  int fetch_tablet_sstable_array_(const common::ObTabletID &tablet_id, const storage::ObTabletHandle &tablet_handle,
       const share::ObBackupDataType &backup_data_type, common::ObIArray<storage::ObITable *> &sstable_array);
   int prepare_tablet_logic_id_reader_(const common::ObTabletID &tablet_id, const storage::ObTabletHandle &tablet_handle,
       const storage::ObITable::TableKey &table_key, const blocksstable::ObSSTable &sstable,
diff --git a/src/storage/compaction/ob_partition_merge_policy.cpp b/src/storage/compaction/ob_partition_merge_policy.cpp
index 34b1f89b76..0433b29c23 100644
--- a/src/storage/compaction/ob_partition_merge_policy.cpp
+++ b/src/storage/compaction/ob_partition_merge_policy.cpp
@@ -1344,7 +1344,7 @@ int ObAdaptiveMergePolicy::find_meta_major_tables(
     }
 
 #ifdef ERRSIM
-  if (OB_NO_NEED_MERGE = ret) {
+  if (OB_NO_NEED_MERGE == ret) {
     ret = OB_E(EventTable::EN_SCHEDULE_MEDIUM_COMPACTION) ret;
     if (OB_FAIL(ret) && tablet.get_tablet_meta().tablet_id_.id() > ObTabletID::MIN_USER_TABLET_ID) {
       FLOG_INFO("set schedule medium with errsim", "tablet_id", tablet.get_tablet_meta().tablet_id_);
diff --git a/src/storage/high_availability/ob_storage_ha_reader.cpp b/src/storage/high_availability/ob_storage_ha_reader.cpp
index 5280710820..88e54c760d 100644
--- a/src/storage/high_availability/ob_storage_ha_reader.cpp
+++ b/src/storage/high_availability/ob_storage_ha_reader.cpp
@@ -1420,13 +1420,13 @@ int ObCopySSTableInfoRestoreReader::get_tablet_meta_(
     LOG_WARN("tablet should not be NULL", K(ret), KP(tablet), K(tablet_id));
   } else if (OB_FAIL(tablet->build_migration_tablet_param(tablet_meta))) {
     LOG_WARN("failed to build migration tablet param", K(ret), K(tablet_id));
-  } else if (OB_FAIL(may_update_tablet_meta_(tablet_id, tablet_handle, tablet_meta))) {
+  } else if (OB_FAIL(update_tablet_meta_if_restore_major_(tablet_id, tablet_handle, tablet_meta))) {
     LOG_WARN("may update tablet meta failed", K(ret), K(tablet_id));
   }
   return ret;
 }
 
-int ObCopySSTableInfoRestoreReader::may_update_tablet_meta_(
+int ObCopySSTableInfoRestoreReader::update_tablet_meta_if_restore_major_(
     const common::ObTabletID &tablet_id,
     ObTabletHandle &tablet_handle,
     ObMigrationTabletParam &tablet_meta)
@@ -1437,14 +1437,8 @@ int ObCopySSTableInfoRestoreReader::may_update_tablet_meta_(
     backup::ObBackupTabletMeta backup_tablet_meta;
     if (OB_FAIL(get_backup_major_tablet_meta_(tablet_id, backup_tablet_meta))) {
       LOG_WARN("failed to get major tablet storage schema", K(ret), K(tablet_id));
-    } else if (OB_FAIL(compare_storage_schema_(tablet_id, tablet_handle, backup_tablet_meta, need_update_storage_schema))) {
-      LOG_WARN("failed to compare storage schema", K(ret), K(tablet_id));
-    } else if (need_update_storage_schema) {
-      tablet_meta.storage_schema_.reset();
-      if (OB_FAIL(tablet_meta.storage_schema_.init(tablet_meta.allocator_,
-          backup_tablet_meta.tablet_meta_.storage_schema_))) {
-        LOG_WARN("failed to init storage schema", K(ret), K(tablet_meta), K(backup_tablet_meta));
-      }
+    } else if (OB_FAIL(tablet_meta.assign(backup_tablet_meta.tablet_meta_))) {
+      LOG_WARN("failed to assign tablet meta", K(ret), K(backup_tablet_meta));
     }
   }
   return ret;
diff --git a/src/storage/high_availability/ob_storage_ha_reader.h b/src/storage/high_availability/ob_storage_ha_reader.h
index 55d4330665..c3ebc4e5f8 100644
--- a/src/storage/high_availability/ob_storage_ha_reader.h
+++ b/src/storage/high_availability/ob_storage_ha_reader.h
@@ -363,7 +363,7 @@ private:
   int get_tablet_meta_(
       const common::ObTabletID &tablet_id,
       ObMigrationTabletParam &tablet_meta);
-  int may_update_tablet_meta_(
+  int update_tablet_meta_if_restore_major_(
       const common::ObTabletID &tablet_id,
       ObTabletHandle &tablet_handle,
       ObMigrationTabletParam &tablet_meta);
diff --git a/src/storage/high_availability/ob_tablet_group_restore.cpp b/src/storage/high_availability/ob_tablet_group_restore.cpp
index b99cf373c6..03c0c83229 100644
--- a/src/storage/high_availability/ob_tablet_group_restore.cpp
+++ b/src/storage/high_availability/ob_tablet_group_restore.cpp
@@ -2714,6 +2714,8 @@ int ObTabletFinishRestoreTask::process()
     LOG_WARN("failed to update data status", K(ret), KPC(tablet_restore_ctx_));
   } else if (OB_FAIL(update_restore_status_())) {
     LOG_WARN("failed to update restore status", K(ret), KPC(tablet_restore_ctx_));
+  } else if (OB_FAIL(check_tablet_valid_())) {
+    LOG_WARN("failed to check tablet valid", K(ret), KPC(tablet_restore_ctx_));
   }
 
   if (OB_SUCCESS != (tmp_ret = record_server_event_())) {
@@ -2795,6 +2797,26 @@ int ObTabletFinishRestoreTask::update_restore_status_()
   return ret;
 }
 
+int ObTabletFinishRestoreTask::check_tablet_valid_()
+{
+  int ret = OB_SUCCESS;
+  ObTabletHandle tablet_handle;
+  ObTablet *tablet = nullptr;
+  const int64_t timeout_us = ObTabletCommon::NO_CHECK_GET_TABLET_TIMEOUT_US;
+  if (!is_inited_) {
+    ret = OB_NOT_INIT;
+    LOG_WARN("tablet finish restore task do not init", K(ret));
+  } else if (OB_FAIL(ls_->get_tablet(tablet_restore_ctx_->tablet_id_, tablet_handle, timeout_us))) {
+    LOG_WARN("failed to get tablet", K(ret), KPC(tablet_restore_ctx_), K(timeout_us));
+  } else if (OB_ISNULL(tablet = tablet_handle.get_obj())) {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("tablet should not be NULL", K(ret), KP(tablet), KPC(tablet_restore_ctx_));
+  } else if (OB_FAIL(tablet->check_valid())) {
+    LOG_WARN("failed to check valid", K(ret), KPC(tablet));
+  }
+  return ret;
+}
+
 int ObTabletFinishRestoreTask::record_server_event_()
 {
   int ret = OB_SUCCESS;
diff --git a/src/storage/high_availability/ob_tablet_group_restore.h b/src/storage/high_availability/ob_tablet_group_restore.h
index 34bdab0c98..58928f1a68 100644
--- a/src/storage/high_availability/ob_tablet_group_restore.h
+++ b/src/storage/high_availability/ob_tablet_group_restore.h
@@ -457,6 +457,7 @@ public:
 private:
   int update_data_status_();
   int update_restore_status_();
+  int check_tablet_valid_();
   int record_server_event_();
 
 private:
diff --git a/src/storage/tablet/ob_tablet.cpp b/src/storage/tablet/ob_tablet.cpp
index ed6656d83c..e749c92f6d 100644
--- a/src/storage/tablet/ob_tablet.cpp
+++ b/src/storage/tablet/ob_tablet.cpp
@@ -3369,5 +3369,22 @@ int ObTablet::remove_memtables_from_data_checkpoint()
 
   return ret;
 }
+
+int ObTablet::check_valid() const
+{
+  int ret = OB_SUCCESS;
+  if (OB_UNLIKELY(!is_inited_)) {
+    ret = OB_NOT_INIT;
+    LOG_WARN("not inited", K(ret), K_(is_inited));
+  } else if (OB_FAIL(check_max_sync_schema_version())) {
+    LOG_WARN("fialed to check max sync schema version", K(ret), KPC(this));
+  } else if (OB_FAIL(check_medium_list())) {
+    LOG_WARN("failed to check medium list", K(ret), KPC(this));
+  } else if (OB_FAIL(check_sstable_column_checksum())) {
+    LOG_WARN("failed to check sstable column checksum", K(ret), KPC(this));
+  }
+  return ret;
+}
+
 } // namespace storage
 } // namespace oceanbase
diff --git a/src/storage/tablet/ob_tablet.h b/src/storage/tablet/ob_tablet.h
index eea59361c0..67d6e87f93 100644
--- a/src/storage/tablet/ob_tablet.h
+++ b/src/storage/tablet/ob_tablet.h
@@ -389,6 +389,9 @@ public:
       const ObMigrationTabletParam *tablet_meta);
   int clear_memtables_on_table_store(); // be careful to call this func, will destroy memtables array on table_store
   int remove_memtables_from_data_checkpoint();
+  // different from the is_valid() function
+  // typically used for check valid for migration or restore
+  int check_valid() const;
   TO_STRING_KV(KP(this), K_(wash_score), K_(ref_cnt), K_(tablet_meta), K_(table_store), K_(storage_schema),
       K_(medium_info_list));
 private: