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NOTE You can apply an incremental backup to an existing image copy, which will update the image copy to reflect the changes in the incremental backup This feature is described in more detail later in the chapter Incremental backups are subcategorized into two types, differential and cumulative Differential backups contain changed data since the last full or incremental, and is the default type when no other type is specified Cumulative backups contain changed data since the last full backup If you have a cumulative backup, you can recover by applying just two backups, the last full and the cumulative incremental This reduces the recovery time since fewer backups are applied during recovery Cumulative backups are preferred when shorter recovery time is a priority over disk space During media recovery, RMAN prefers incremental backups over archived logs and will use one if present This is because the incremental backups also capture changes made by NOLOGGING transactions, which by their definition are not logged into the archived logs Such transactions are lost if recovering using archived logs RMAN and Compression RMAN has several features that enable you to store backups in compressed format Compressing the backup will provide you storage savings and also give you better performance because the backup I/O will involve fewer blocks NOTE The RMAN compression features are applicable only when you create backups in the backup set format and not with image copy A compression feature that is inherent with RMAN and cannot be disabled is the unused block compression With this feature, RMAN skips blocks from the database files that are not allocated to any database objects or, if allocated, have never been used to store any data (also known as null blocks) The unused block compression can also skip blocks that once had data but are now empty (blocks under the high watermark) The empty block compression
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High Availability and Backup Strategies
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feature is available when performing backups to disk, and also to tape but only when Oracle Secure Backup (OSB) is the media manager RMAN is also capable of performing binary compression of backup sets using industry-standard compression algorithms Binary compression will compress the backup sets before they are written to disk The compression can be performed using different algorithms (BZIP2, LZO, and ZLIB) and the appropriate algorithm is selected when you set the compression level (BASIC, LOW, MEDIUM, or HIGH) before initiating the backups Based upon the compression-level settings, you get different compression ratios and backup performance NOTE Compression levels of LOW, MEDIUM, and HIGH requires you to be licensed for the Advanced Compression Option for the Oracle database The BASIC level is included with the Oracle database license If you are using database compression features such as OLTP compression and Exadata Hybrid Columnar Compression, you are already reducing the overall disk footprint of database files The best practice in such a case is not to compress the data again using RMAN Compressing the same data twice does not provide any measurable savings, and in fact in some cases, might even be an overhead RMAN Best Practices Follow the RMAN best practices specified here to get higher performance and availability with the Database Machine
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Use block change tracking Enhance the performance of RMAN incremental backups by using the block change tracking (BCT) feature When BCT is enabled, the database keeps track of the blocks that get modified using a block change tracking file The BCT file gets one entry when one or all blocks in a chunk (32K) gets modified When RMAN starts an incremental backup, it uses the block change tracking file to identify the changed blocks since the last incremental backup, and reads only the changed blocks from the disk Otherwise, without BCT, all blocks are read and the SCN on each block is checked to identify if the block was modified
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