Praveen Srivatsa Director| AstrhaSoft Consulting blogs.asthrasoft.com/praveens |

What’s New/Improved Mirrored Backups Partial Backups/Restores & Piecemeal Restores Improved reliability with Backup Checksums Online Restore Fast Recovery Improved RESTORE VERIFYONLY Page Restores

Simple Recovery Model Backup supports the following backup types: Full Backup Partial Backup ( * New) File Backup Differential Backup Full Differential Backup Partial Differential Backup File Differential Backup

Full Recovery Model In Addition to Full and Differential Backups, it supports the following backup types: Transaction log Backups Pure Log Backup Contains only transaction logs without and bulk changes Bulk Log Backup Includes log and, also, data pages changed by bulk operations. Tail Log Backup Taken from a possibly damaged database to capture the log that has not yet been backed up

Enhanced Error Detection In SQL Server 2000 RESTORE VERIFYONLY does not guarantee that the backup is good Data may be corrupt In SQL Server 2005 RESTORE VERIFYONLY checks everything Ensures that the data is correct

Database Checksums SQL Server 2000 had TornPageDetection to detect incomplete I/O Operations by power failures SQL Server 2005 adds checksums to data pages Header of every page contains a checksum value When reading page, it re-computes checksum and compares with checksum stored Returns error (824) if difference found Detects errors not reported by I/O Subsystem

Backup Checksums Detect errors introduced by backup hardware but not reported by hardware or operating system Backup media error detection Backup devices do not always detect errors Works with RESTORE RESTORE VERIFYONLY Restore also checks page checksums, if present Disk error detection on data pages prior to backup Can continue past errors if desired

Restores – New Features SQL Server 2000 Database unavailable while restoring SQL Server 2005 Online Restores Partial Restores Skips roll forward of logs for read-only data files

Online Restores Supported in Enterprise, and Developer editions For Databases containing multiple filegroups Only the secondary filegroup being restored is unavailable When restoring filegroups, all filegroups must be restored to bring the database to a consistent state

Piecemeal Restores The goal is to restore and recover a database in stages, by filegroup(s) The primary filegroup must be restored in the first stage Database is brought online Critical Data is online Other filegroups not restored are marked offline Remaining files can be restored later Transaction Logs are not applied to read only filegroups

Large multi-terabyte databases and many databases per instance Very Large Backups Use multiple backup devices simultaneously Parallel I/O Parallel task execution Up to 64 devices supported Use snapshot backups

Large multi-terabyte databases and many databases per instance Disk Backup Performance Scales linearly with number of disks RAID 5 - poor write performance Separate drive usually best Sometimes can use multiple backups per logical drive (test) Compression Hardware Application – Third-party tools

Database Maintenance Wizard The Database maintenance wizard has been enhanced to support additional features. Maintenance Tasks Included Check database integrity Shrink database Defragment Indexes Re-index Update statistics History cleanup Launch SQL Server Agent Job Backup database (Full) Backup database (Differential) Backup database (Transaction Log)

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