backup, file manipulation operations (such as ALTER DATABASE ADD FILE) and encryption changes on a database must be serialized.

  昨天在检查YourSQLDba备份时，发现有台数据库做备份时出现了下面错误信息，如下所示：

<Exec>

  <ctx>yMaint.ShrinkLog</ctx>

  <inf>Log Shrink</inf>

  <Sql>

--  ========================================================================

-- Shrink of log file E:\SQL_LOG\xxxx_log.ldf

USE [xxxx]

DBCC SHRINKFILE (N'xxx_Log',      19043) with no_infomsgs           

--  ========================================================================

   </Sql>

  <err>Error 3023, Severity 16, level 2 : Backup, file manipulation operations (such as ALTER DATABASE ADD FILE) and encryption changes on a database must be serialized. Reissue the statement after the current backup or file manipulation operation is completed.

</err>

</Exec>