> I am researching RMAN and I am trying to understand how to parallelize the > backup. > I have come across the following statement in various papers and in the 8i > Backup and Recovery Course Material : > > It is important to set FILESPERSET in the backup. > This will ensure that each allocated channel only processes the specified > number of files. > If you DO NOT specify FILESPERSET then the backup would only be undertaken > by "1 channel" and "all other allocated channels would sit idle". > > Yet in the "8.1.6 RMAN User's Guide and Reference" it contradicts this (pg > 1-31) : > > The number of channels that you allocate affects the degree of parallelism > within the command. > RMAN internally handles parallelization. You only need to specify : > > 1 'allocate channel' command > The objects that you want to backup > Parallelism is exploited only within the context of a single command. > > So it does not mention that you HAVE TO specify the FILESPERSET statement. > > On digging further into the FILESPERSET statement the manual states (pg > 1-36) : > The default value of this parm is calculated by RMAN as follows ; > RMAN takes the lower of the following 2 values ; 64 or > number-of-files/number-of-channels. > > Page 1-37 gives an example of using the Default FILESPERSET - and how RMAN > would parallelize the backup. > > Which is right ? > Do you have to specifically specify the FILESPERSET parm in the BACKUP > command for RMAN to parallelize the backup operation? > or > Can you leave it out of the BACKUP command and use the default value ? > > > Thanks in advance > > _________________________ > Patrick J. Howe > Oracle DBA > Illuminet Inc. (Carrier Division of Verisign) > 4501 Intelco Loop SE > Olympia, WA 98507 > Email : [EMAIL PROTECTED] > > -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Pat Howe INET: [EMAIL PROTECTED]
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