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Module 3: Disaster Recovery
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Overview
Planning a Database Backup Strategy
Backing Up a User Database
Restoring User Databases
Performing Online Restore Operations
Recovering Data from Database Snapshots
System Databases and Disaster Recovery
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Lesson 1: Planning a Database Backup Strategy
Overview of Microsoft SQL Server Backup Types
What Are Recovery Models?
What Is a Full Database Backup Strategy?
What Is a Database and Transaction Log Backup Strategy?
What Is a Differential Backup Strategy?
What Is a File or Filegroup Backup Strategy?
Considerations for Backup Operators and Media
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Overview of Microsoft SQL Server Backup Types
Backup Types Description
Full All data files and part of the transaction log
Differential The parts of the database that have changed since the last full database backup
Partial The primary filegroup, every read/write filegroup, and any specified read-only filegroups
Transaction Log Any database changes recorded in the log files
Tail-Log Backup Log backup taken of the tail of the log just before a restore operation
File/File Group Specified files or filegroups
Copy Only The database or log (without affecting the backup sequence)
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What Are Recovery Models?
Recovery Model Description
Simple No log backups Automatically reclaims log space to keep space
requirements small
Full Requires log backups No work is lost due to a lost or damaged data file Can recover to an arbitrary point in time
Bulk Logged Requires log backups An adjunct of the full recovery model that
permits high-performance bulk copy operations Reduces log space usage by using minimal
logging for most bulk operations
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What Is a Full Database Backup Strategy?
A Full Database Backup Strategy:
Involves Performing Regular Full Backups
Is appropriate for small databases
Is almost always the first to be restored and that other types of backup depend on it
Sunday Monday Tuesday
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What Is a Database and Transaction Log Backup Strategy?
A Database and Transaction Log Backup Strategy:
Involves performing regular backups
Supplementing regular database backups with transaction log backups
Enables restoring the database to the last transaction log backup
Sunday Monday
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What Is a Differential Backup Strategy?
A Differential Backup Strategy:
Involves performing full database backups
Supplementing full database backups with differential backups
Is useful if a subset of a database is modified more frequently than the rest of the database
Monday Tuesday
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What Is a File or Filegroup Backup Strategy?
A File or Filegroup Strategy: Involves backing up individual files or filegroups on a regular basis
Utilizes less disk space than full database backups
Is a strategy for very large databases
Sunday Monday Tuesday Wednesday
Data
file 1 Data
file 2 Data
file 3
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Considerations for Backup Operators and Media
SQL Server Backups:
Are written to a backup device
Can be written to tape or disk but not simultaneously to both
Are written to media sets and media families
Database Backups can be performed by:
Sysadmin Server Role Members
Db_owner fixed database Role Members
Db_backupoperator Role Members
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Options for Ensuring Backup Integrity
Contingencies:
Mirrored Media Sets
Backup Verification
Checksums
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Demonstration: Backing Up a Database
In this demonstration we will:
Backup the Adventure Works database
Enable backup compression
Verify the backup
Perform a checksum
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Lesson 2: Restoring User Databases
How the Restore Process Works
Types of Restores
Restoring a Database
Restoring a Transaction Log
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How the Restore Process Works
The restore process consists of three distinct phases:
The Data Copy Phase 1.
The Redo Phase 2.
The Undo Phase 3.
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Types of Restores
Restore Types:
Complete Database Restore
File Restore
Page Restore
Piecemeal Restore
Online Restore
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Restoring a Database
Steps to Restore a Database:
Perform a Tail-Log Backup
Determine the Target Recovery Point (full or bulk-logged recovery models only) 2.
Determine the Type of Restore to Apply 3.
1.
Identify Which Backups You Require 4.
Begin the Restore Sequence 5.
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Restoring a Transaction Log
Steps to Restore the Transaction Log:
Full or Differential Database Restore
Restore Transaction Logs in Order W/ NORECOVERY 2.
Restore Latest Log WITH RECOVERY 3.
1.
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Demonstration: Restoring a Database
In this demonstration, you will restore the AdventureWorks2008 database
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Considerations for Backing Up Systems Databases
SQL Server maintains a set of system-level databases which are essential for the operation of a server instance
The following system databases must be backed up include msdb, master, and model
Back up the distribution system database if any database uses replication on the server instance
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Considerations for Restoring Systems Databases
System Database Description
Master Backup Required: Yes Recovery Model: Simple
Model Backup Required: Yes Recovery Model: User configurable
Msdb Backup Required: Yes Recovery Model: Simple (default)
Resource Backup Required: No Recovery Model: N/A
Tempdb Backup Required: No Recovery Model: Simple
Configuration Distribution
Backup Required: Yes Recovery Model: Simple
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Daniel Ramos Castaeda
Certificaciones: MCP, MCTS, MAP, MCPS, MCNPS
Especializaciones:
MCPS 2.0 - AOS: Business Intelligence Competency 1 MCPS 2.0 - AOS: Competency- Integrated E-Business Solutions
AOS: Application Integration Competency MCPS 2.0 - AOS: Data Platform Competency
MCTS: SQL Server 2005 y 2008 AOS: Business Intelligence Competency 2
AOS : BUSINESS INTELLIGENCE COMPETENCY - BUSINESS INTELLIGENCE PLATFORM
AOS: Data Management Solutions Competency-Database Management for SQL Server 2005
AOS : Microsoft Dynamics AX - SQL server AOS : ERP Competency - Microsoft Dynamics GP - SQL server
AOS : Microsoft Dynamics NAV - SQL server AOS : Microsoft Dynamics SL - SQL Server
AOS : Microsoft Dynamics Point of Sale - SQL Server
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