这是我从log中看到的。查看其他英文资料好像和sql server full text search服务有关啊。要先挂起这个服务才能继续，问题是只要有查询这个服务就不会被挂起，那岂不是还是要在数据库几乎离线情况下才能备份？在线的商品数据库时时刻刻都会有人查询啊。
Generally, SQL Server performs these tasks during a BACKUP operation:
1. Temporarily suspends Microsoft Full-Text Engine for SQL Server (MSFTESQL) service and flushes to disk all pending changes to the full-text catalog. Also, SQL Server stops all write activity on the catalog and queues all changes that have not yet been processed at the start of the backup in the notification log so that these changes could be committed to the full-text catalogs when the backup is complete.
The catalog status is persisted on disk. At this point, you can still query the catalog.
2. Backs up all table and full-text catalog data, change tracking log, and metadata.
3. Backs up all data, in the transaction log, that has occurred since the backup process started.
4. Resumes MSFTESQL service as well as the population of full-text indexes.