Sql Server 全数据库备份

Question

如果备份需要 4 小时才能完成，SQL Server 将如何备份这 4 小时内发生的已提交事务。

Answer 1

From Books Online:

A full database backup backs up the whole database. This includes part of the transaction log so that the full database can be recovered after a full database backup is restored. Full database backups represent the database at the time the backup finished.

The key is that full database backups include part of the transaction log. So SQL Server backup the committed transactions that happen during these 4 hours by reading the transaction log.