5. SQL Restore tasks

• Objectives– Learn howto recover databases from disaster

• Contents– View database and transaction log backup files

– Perform a complete data restoration of a user database

– Recover a database to a specified point in time

– Restore a database to standby mode using

• Practicals– Recover your databases

• Summary

Determining the Data Restoration Sequence

• msdb database, SQL Server 2000 records the details of the backup and the restore history in the msdb database

– which devices or files the backup is stored on, – Who performed the backup, – and at what time.

• If the msdb database is damaged, you should restore the msdb database from backup before you restore any user databases.

• Check what backups you have in the Management container, right click and select properties or double click and view contents

• Use the transact SQL

• If you do not have a recent backup of the msdb database or are restoring to another SQL Server 2000 instance.

– read each backup file and add the information to the msdb database– Restore msdb history

RESTORE LABELONLY FROM gurkaRESTORE HEADERONLY FROM gurkaRESTORE FILELISTONLY FROM gurka

RESTORE LABELONLY FROM gurkaRESTORE HEADERONLY FROM gurkaRESTORE FILELISTONLY FROM gurka

Retrieving Backup Media InformationTo retrieve backup media information1. Ensure that you are logged on to the SelfPacedSQL.MSFT domain

controller as Administrator.2. In the SQL Server Enterprise Manager console tree, expand the default

instance, expand the Management container, and then click Backup. The backup devices for this SQL Server 2000 instance are displayed in the details pane.

3. In the details pane, right-click SSEMDBTLogBackup and then click Properties. The Backup Device Properties – SSEMTLogBackup dialog box appears displaying the filename associated with this backup device.

4. Click the View Contents button. The View Backup Media Contents dialog box appears, displaying the contents of the SSEMTLogBackup device. Details regarding three transaction log backup sets appear.

5. Switch to SQL Query Analyzer.6. On the toolbar, click the Load SQL Script button. The Open Query File

dialog box appears.7. RESTORE LABELONLY FROM gurka

RESTORE HEADERONLY FROM gurkaRESTORE FILELISTONLY FROM gurka

RESTORE LABELONLY FROM gurkaRESTORE HEADERONLY FROM gurkaRESTORE FILELISTONLY FROM gurka

Back up the transaction log without truncation

• Before you attempt to restore a backup to a database that is still functioning, be sure to restrict user access to it.

• Disk is intact, software error/smartboy caused damage– disk containing a data file failed,

– SQL Server 2000 installation failed

– recover data to an earlier point in time.

• If a disk containing a data file fails, SQL Server Enterprise Manager will display the database containing the damaged data file as suspect.

• If you discover you have a suspect database, you should immediately back up the transaction log without truncation before you attempt any restoration of your dat

Back up the transaction log without truncation, cont.

• If you discover you have a suspect

database

• Backing up the current transaction log

(using the Without Truncation option)

allows you to recover up to the point

of failure.

1. Goto the Databases container,

2. right-click the suspect database in the details pane,

3. point to All Tasks,

4. and then click Restore Database.

• Next, you should replace the failed disk.

If your data is using RAID for fault

tolerance, all that you need to do is to

simply add the new drive to the

RAID system.

Begin restoration suspect Database1. Goto the Databases container,

2. right-click the suspect database in the details pane,

3. point to All Tasks,

4. and then click Restore Database.

• the First Backup To Restore drop-down list allows you to select which backup to try first

• You can make a combination of backup sets that you can use to complete the restoration.

Howto restore suspect Database1. Goto the Databases container,

2. right-click the suspect database in the details pane,

3. point to All Tasks,

4. and then click Restore Database.

5. Select options tab

• You can choose to leave the database operational, not possible to restore additional transaction logs.

• You can choose to leave the database read-only and able to restore additional transaction log files.

• You can leave database read only adn able to restore more transaction logs