The article discusses the shortcomings of traditional backup methods, particularly focusing on the inconsistencies that arise with standard backups. It highlights that simple file-structure backups fail to account for ongoing data modifications, leading to potential data corruption. In contrast, crash-consistent backups capture all data at a specific moment but do not address in-memory transactions. The most reliable solution is application-consistent backups that ensure data is captured accurately, reflecting the application’s state. For SQL Server, a careful approach to different file types (MDF, LDF, NDF) is essential for preserving data integrity during backups.
The oldest type of backup is often inconsistent, capturing only what is on disk, neglecting ongoing changes, particularly problematic for databases with random IO operations.
A crash-consistent backup captures all data at a specific moment but misses any in-memory transactions, making correct operational tasks essential for proper restoration.
Application-consistent backups provide the highest level of protection, ensuring data is captured in a state that reflects the application's current state, offering reliability and consistency.
For SQL Server, various file types like MDF, LDF, and NDF require careful management in backups to maintain data integrity and consistency.
#backup-methods #data-consistency #sql-server #crash-consistent-backup #application-consistent-backup
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