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Availability and recoverySQL Server

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Availability and recovery

SQL Server

Log file settings Recovery models Truncate/shrink Backups and restore

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Log file settings

Recommendations Size log files (set initial log size, auto-growth – not use default) Log file on a different partition (for performance and recovery) Monitor the log size and create jobs and alerts to regularly manage the transaction log Using Maintenance plans to -create a backup files and Maintenance Clean-up task – to delete old

backups

VLF• DBCC LOGINFO – results count• Having too many VLFs adds overhead to both backup performance and transaction log performance

(logging)

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Recovery models

1. Simple

2. Bulk logged

3. Full

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Truncate/shrink

Truncate• Frees up used space within the file

• Occurs automatically at checkpoints, after log backups

Shrink• Shrinks space from a file – looses continuity for log transaction/backup sets

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Back up and restore

Full database

Transaction log

Differential database

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References

• Microsoft sql server 2000 high availability – Chapter 9 Database environment basics for recovery

• Different ways to restore a SQL Server database - http://www.mssqltips.com/sqlservertip/3049/different-ways-to-restore-a-sql-server-database/

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Thank you

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Anca Roscan Developer

anca.roscan@endava.com

en_aroscan