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CHAPTER 7 DATABASE BACKUPS, RECOVERY, AND MAINTENANCE
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able to deal with it. However, most backups do not happen when you are there and will happen through the night. In the next section, you will see more about scheduling jobs and how to schedule a task to run through the night. However, it doesn t cover what to do when things go wrong. This is a difficult area to discuss and should be integrated with our database maintenance plan, which is covered later in this chapter in the section Creating a Database Maintenance Plan. This example demonstrates how to complete a backup manually rather than as an automated process. Before moving on, there are a couple more points concerning backups that you must keep in mind, and it is recommended strongly that these directions be followed. First of all, keep a regular and up-to-date backup of the master and msdb system databases. SQL Server very rarely becomes corrupted, but it can happen for any number of reasons, from a hard drive failure to a developer altering the database in error. It really doesn t matter, but if you don t have a backup of the master database, you could find yourself in trouble. However, be warned. Restoring the master database should not be performed unless you really have to, and only if you are experienced with SQL Server. Restoring the master database is not like restoring other databases, and has to be completed outside SQL Server Management Studio. This book quite deliberately does not cover having to restore the master database, since it is a very advanced topic. If you wish to know more, then take a look at Books Online for more details. When it comes to the msdb database and when to back it up, it could be that a daily backup is required. If you recall, this database holds job schedules and other information pertinent to the SQL Server Agent for scheduling. If you have jobs that run each day, and you need to keep information about when jobs were run, a daily backup may be required. However, if you only wish to keep a backup of jobs, etc. that are set up and there is no need to know when certain jobs ran and whether they were successful or not, then perhaps look at backing up this database weekly. The model database should be backed up if any details within the model database have been altered. This should be pretty infrequent, and therefore backing up this database need not be as regular as any other database; once a week is probably frequent enough. Backing up tempdb is not necessary, as this should be seen as a transient database, which has no set state.
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Note When SQL Server is restarted, tempdb is dropped and is re-created as part of the startup process.
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As you can see, it is not just your own databases that need to be considered and remembered when it comes to dealing with your backup strategy. A database within SQL Server is not an insular arrangement and affects the system databases just as much. If in doubt, back it up more frequently than is required!
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Backing Up the Database Using T-SQL
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Now that we have backed up the database using the wizard, it is useful to demonstrate performing a backup with T-SQL. These commands and statements can be used within a stored procedure that can be scheduled to run at required intervals as part of an overnight task.
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CHAPTER 7 DATABASE BACKUPS, RECOVERY, AND MAINTENANCE
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There are two different types of backups. It is possible to either back up the database or specific file groups or files that are part of the database. The code for the database backup follows. The highlighted code will demonstrate which of the two possible options is the optional default used when neither option is specified. BACKUP DATABASE { database_name | @database_name_var } TO < backup_device > [ ,...n ] [ [ MIRROR TO < backup_device > [ ,...n ] ] [ ...next-mirror ] ] [ WITH [ BLOCKSIZE = { blocksize | @blocksize_variable } ] [ [ , ] { CHECKSUM | NO_CHECKSUM } ] [ [ , ] { STOP_ON_ERROR | CONTINUE_AFTER_ERROR } ] [ [ , ] DESCRIPTION = { 'text' | @text_variable } ] [ [ , ] DIFFERENTIAL ] [ [ , ] EXPIREDATE = { date | @date_var } | RETAINDAYS = { days | @days_var } ] [ [ , ] PASSWORD = { password | @password_variable } ] [ [ , ] { FORMAT | NOFORMAT } ] [ [ , ] { INIT | NOINIT } ] [ [ , ] { NOSKIP | SKIP } ] [ [ , ] MEDIADESCRIPTION = { 'text' | @text_variable } ] [ [ , ] MEDIANAME = { media_name | @media_name_variable } ] [ [ , ] MEDIAPASSWORD = { mediapassword | @mediapassword_variable } ] [ [ , ] NAME = { backup_set_name | @backup_set_name_var } ] [ [ , ] { NOREWIND | REWIND } ] [ [ , ] { NOUNLOAD | UNLOAD } ] [ [ , ] STATS [ = percentage ] ] [ [ , ] COPY_ONLY ] ] If instead you just wish to back up specific files or file groups, the difference in the code is highlighted in the BACKUP DATABASE statement shown here: BACKUP DATABASE { database_name | @database_name_var } <file_or_filegroup> [ ,...f ] TO <backup_device> [ ,...n ] [ [ MIRROR TO <backup_device> [ ,...n ] ] [ ...next-mirror ] ] [ WITH [ BLOCKSIZE = { blocksize | @blocksize_variable } ] [ [ , ] { CHECKSUM | NO_CHECKSUM } ] [ [ , ] { STOP_ON_ERROR | CONTINUE_AFTER_ERROR } ] [ [ , ] DESCRIPTION = { 'text' | @text_variable } ] [ [ , ] DIFFERENTIAL ] [ [ , ] EXPIREDATE = { date | @date_var }
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