SQL Server 数据库完整备份不只是备份数据还有日志
以前认为SQL Server完整备份只是备份数据库的数据而不包含日志，其实这是错误的。使用RESTOREHEADERONLY可以帮我们验证（msdb.db
以前认为SQL Server完整备份只是备份数据库的数据而不包含日志，其实这是错误的。使用RESTOREHEADERONLY可以帮我们验证（msdb.dbo.backupset也包含相应的信息）。
RESTORE HEADERONLY回包含特定备份设备上所有备份集的所有备份标头信息的结果集。查询结果包含三列：
FirstLSN
numeric(25,0)
备份集中第一个日志记录的日志序列号。
NULL
LastLSN
numeric(25,0)
备份集之后的下一条日志记录的日志序列号。
NULL
CheckpointLSN
numeric(25,0)
创建备份时最后一个检查点的日志序号。
NULL
数据库在CHECKPOINT之后开始读数据，，读数据过程中可能有些PAGE数据已经被更改，但是SQL SERVER不会重新读一次，这样就需要包含这些更改PAGE的LSN，从而在还原的时候将日志操作重新应用到数据库（REDO/UNDO）。
RESTOREHEADERONLY (Transact-SQL): (v=sql.90).aspx
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