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CHAPTER 7 DATABASE BACKUPS, RECOVERY, AND MAINTENANCE
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You can back up not only the data, but also, and just as importantly, the transaction log for the database. Just to recap, the transaction log is a file used by databases to log every transaction, including DML actions such as rebuilding indexes. In other words, every data modification that has taken place on any table within the database will be recorded within the transaction log. The transaction log is then used in many different scenarios within a database solution, but where it is most useful, from a database recovery point of view, is when a database crashes. In this case, the transaction log can be used to move forward from the last data backup, using the transactions listed within the transaction log. If a database crash occurs, then the full and differential backups will only take you to the last valid backup. For data entered since that point, the only way to restore the information is to then replay the transactions that were committed and recorded as committed in the transaction log. Any actions that were in progress at the time of the failure that were within a transaction that was still in progress would have to be rerun from the start. So, to clarify, if you were in the process of deleting data within a table and the power was switched off, you would use your full and differential backups to restore the data. You would then use the information within the transaction log to replay all successful transactions, but because the delete had not been successful, the table would have all the data still within it. Backing up the transaction log is a good strategy to employ when a large number of updates occur to the data through the day. A transaction log backup should take place at set times throughout the day depending on how large the transaction log has grown and how crucial it was to get your system back up and running after any unexpected outage. When a transaction log is backed up, the transaction log itself is logically shrunk in size so that the transaction log is kept small. It also gives you point-in-time recoverability; this means that you can quickly restore to any time in the past where the transaction was backed up. Backing up a transaction log is similar to backing up a database. The full syntax is as follows and really only differs from a database backup by using the LOG keyword instead of DATABASE and the options NO_TRUNCATE and NORECOVERY/STANDBY: BACKUP LOG { 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 } ] [ [ ,] 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 } ]
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CHAPTER 7 DATABASE BACKUPS, RECOVERY, AND MAINTENANCE
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NAME = { backup_set_name | @backup_set_name_var } ] NO_TRUNCATE ] { NORECOVERY | STANDBY = undo_file_name } ] { NOREWIND | REWIND } ] { NOUNLOAD | UNLOAD } ] STATS [ = percentage ] ] COPY_ONLY ]
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To detail the options not covered when looking at backing up the database earlier, let s look at them now: LOG: Determines that we wish to produce a backup of the transaction log rather than a backup of a database or files/file groups. NO_TRUNCATE: Will not truncate the log after the backup. If the database is corrupt, using this option will allow the backup to be attempted at least. Without this option, you will get an error message. NORECOVERY | STANDBY: Means that after the backup, the database will be in a state whereby it looks to anyone trying to connect as if it is still being restored.
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