SQLSERVER备份事务日志的作用
SQLSERVER备份事务日志的作用 事务日志备份有以下3种类型 (1)纯日志备份:仅包含相隔一段时间的事务日志记录,而不包含任何大容量更改 (2)大容量操作日志备份.包括由大容量操作更改的日志和数据页,不支持时间点恢复 (3)尾日志备份:从可能已破坏的数据库创建,用
SQLSERVER备份事务日志的作用
事务日志备份有以下3种类型
(1)纯日志备份:仅包含相隔一段时间的事务日志记录,而不包含任何大容量更改
(2)大容量操作日志备份.包括由大容量操作更改的日志和数据页,不支持时间点恢复
(3)尾日志备份:从可能已破坏的数据库创建,用于捕获尚未备份的日志记录。在失败后创建尾日志备份可以防止工作损失，美国空间，
并且，尾日志备份可以包含纯日志或大容量日志数据
必须至少有一个完整备份或一个等效文件备份集，才能进行任何日志备份。通常DBA定期（如每周）创建数据库完整备份，
以更短的间隔（如每天）创建差异备份，并会频繁（如每10分钟）创建事务日志备份。
最恰当的备份间隔取决于一系列因素，如数据的重要性、数据库的大小和服务器的工作负荷
如果事务日志损坏，美国服务器，则将丢失自最新的日志备份后所执行的工作。
为此，建议经常对关键数据进行日志备份，香港空间，并注意将日志文件存储在容错存储设备中
事务日志备份顺序独立于完整备份。可以生成一个事务日志备份顺序，然后定期生成用于开始还原操作的完整备份
------------------------------------------------华丽的分割线-----------------------------------------------------
最佳实践
每15~30分钟：事务日志备份
每天：差异备份
每周：完整备份
备份日志尾部失败后执行尾日志备份，以防止丢失所做工作，在失败之后并且在开始还原数据库之前，或者在故障转移到辅助数据库时，
备份活动日志（尾日志备份）。选择此选项等效于在TSQL 中backup log 语句中指定norecovery选项
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