Several options are available for enhancing backup performance and reducing the network bandwidth used for performing backups. These options include:
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Specifying the number of datafiles and archive files to be included in each RMAN backupset. The default value is 32.
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Limiting the maximum size for each RMAN backupset. By default no limits are defined.
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Limiting the number of open datafiles that can be read by RMAN during the backup. The default value is 8.
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Limiting the maximum size of data blocks used during backups. The default value is 1048576 KB.
In addition to the above configurations, you can also enable distribution of data across disks during backup operations. See Performance Tuning for more details
Procedure
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From the CommCell Browser, navigate to Client Computers | <Client> | Oracle| <Instance>.
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Right-click the <Subclient>, and then click Properties.
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Click the Advanced tab.
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In the Data Files per BFS box, type or select the number of datafiles in each RMAN backup set.
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In the MAX Backup Set Size (kb) box, type or select the size of the backup set allowed for the RMAN backup set.
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In the Archive Files per BFS box, type or select the number of archive files in each RMAN backup set.
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In the Max Open Files box, type or select the number of datafiles that RMAN can read from simultaneously during a backup operation.
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From the CommCell Browser, navigate to Client Computers | <Client>| Oracle.
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Right-click the <*Instance*>, and then click Properties.
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Click the Details tab.
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In the Block Size box, type or select the size of the block for backup and restore operations.
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Click OK.