Backups that you perform with the
Avamar Plug-in for Oracle in
Avamar Administrator use RMAN. RMAN reads the individual data files, bundles the files into backup sets, and then sends the backup set to
avtar.
To create the backup set, RMAN simultaneously reads multiple files from the disk, and then writes the blocks of file data into the same backup set. The combination of blocks from multiple files is called backup multiplexing. The following figure shows the multiplexing of three files into a backup piece.
Figure 1. RMAN multiplexing
In
Figure 1, RMAN simultaneously reads three files and writes them to the backup set intermingled. The RMAN multiplexing feature intermingles the backup files, and does not provide the data stream in a similar format for subsequent reads.
Because of how the RMAN multiplexing feature intermingles files, backups by the
Avamar Plug-in for Oracle to the Avamar server can contain the duplicate data even if no changes were made to the database since the last backup. The RMAN multiplexing feature can negatively affect the data deduplication ratio of the
Avamar Plug-in for Oracle.
The
Avamar Plug-in for Oracle improves data deduplication performance by enabling you to use the
Filesperset option in
Avamar Administrator.
The
Filesperset option specifies the number of files to include in each backup set. The default value of the
Filesperset option is 1. When you specify a value for the
Filesperset option, RMAN uses the value as a limit for the number of files RMAN includes in a backup set.
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