本文介绍了如何通过使用RMAN命令实现数据库的压缩备份，从而减小备份集占用的空间。重点阐述了压缩备份的限制条件及配置方法，包括将设备类型设置为并行处理和自动压缩备份集。
Compressed backups reduce the amount of space required for storing backup sets. You create a compressed backup of a database by using the command:
RMAN> BACKUP AS COMPRESSED BACKUPSET DATABASE;
The compressed backup set feature cannot be used with pre–Oracle Database10gdatabases. The COMPATIBILITY database initialization parameter must be set to at least10.0.0.0. The compression applies only to backup sets, not image copies.
You can configure RMAN to automatically make compressed backup sets with the CONFIGURE DEVICE TYPE command:
RMAN> CONFIGURE DEVICE TYPE DISK PARALLELISM 2
2> BACKUP TYPE TO COMPRESSED BACKUPSET;
By default compression is disabled.
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