Backing up restoring a 20gb database with images stored as binary code
This topic describes the compression of SQL Server backups, including restrictions, performance trade-off of compressing backups, the configuration of backup compression, and the compression ratio. Backup compression is supported on SQL Server editions: Enterprise, Standard, and Developer. Every edition of SQL Server and later can restore a compressed backup. For more information, see Performance Impact of Compressing Backupslater in this topic.
By default, compression significantly increases CPU usage, and the additional CPU consumed by the compression process might adversely impact concurrent operations. Therefore, you might want to create low-priority compressed backups in a session whose CPU usage is limited by Resource Governor. For information about Windows counters, see Windows help.
For example, a 3: To query on these columns, you can use the following Transact-SQL statement:. The compression ratio of a compressed backup depends on the data that has been compressed. A variety of factors can impact the compression ratio obtained. Typically, if a page contains several rows in which a field contains the same value, significant compression might occur for that value. In contrast, for backing up restoring a 20gb database with images stored as binary code database that contains random data or that contains only one large row per page, a compressed backup would be almost as large as an uncompressed backup.
Encrypted data compresses significantly less than equivalent unencrypted data. If transparent data encryption is used to encrypt an entire database, compressing backups might not reduce their size by much, if at all. If the database is compressed, compressing backups might not reduce their size by much, if at all. For compressed backups, the size of the final backup file depends on how compressible the data is, and this is unknown before the backup operation finishes.
Therefore, by default, when backing up a database using compression, the Database Engine uses a pre-allocation algorithm for the backup file. This algorithm pre-allocates a predefined percentage of the size of the database for the backup file. If more space is needed during the backup operation, the Database Engine grows the file. If the final size is less than the allocated space, at the end of the backup operation, the Database Engine shrinks the file to the actual final size of the backup.
To allow the backup file to grow only as needed to reach its final size, use trace flag Trace flag causes the backup operation to bypass the default backup compression pre-allocation algorithm. This trace flag is useful if you need to save on space by allocating only the actual size required for the compressed backup.
However, using this trace flag might cause a slight performance penalty a possible increase in the duration of the backup operation. View or Configure the backup compression default Server Configuration Option. The feedback system for this content will be changing soon.
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Restrictions The following restrictions apply to compressed backing up restoring a 20gb database with images stored as binary code Compressed and uncompressed backups cannot co-exist in a media set.
Previous versions of SQL Server cannot read compressed backups. Performance Impact of Compressing Backups By default, compression significantly increases CPU usage, and the additional CPU consumed by the compression process might adversely impact concurrent operations. Databases object For information about Windows counters, see Windows help. To query on these columns, you can use the following Transact-SQL statement: The type of data. Character data compresses more than other types of data.
The consistency of the data among rows on a page. Whether the data is encrypted. Whether the database is backing up restoring a 20gb database with images stored as binary code.
Allocation of Space for the Backup File For compressed backups, the size of the final backup file depends on how compressible the data is, and this is unknown before the backup operation finishes.
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