报错1：Unable to read local eventlog (reason: 事件日志文件已在读取间更改。
报错2：Successfully re-opened the local eventlog - NOTE: Some events may have been missed.
微软解释：
http://support.microsoft.com/default.aspx?scid=kb;en-us;811484
解决办法：
如果要防止错误日志, 中出现这些消息可以使用跟踪标志 2505 作为启动参数
要将跟踪标志 2505 作为 SQLServer 启动参数, 使用以下步骤：
1. 企业管理器, 右键单击服务器名称, 依次 属性 。
2. 在 常规 选项卡, 单击 启动参数 。
3. 添加以下作为新参数：
- T2505
4. 重新启动服务器对新参数才能生效
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