Backing Up Oracle - Computing at Cornell

Note
Do not spread I/O over more than the minimum number of disks to keep
the tape streaming. Otherwise, you increase restore time for a file without
increasing performance.
D.2 TDP for Oracle Version 2.1.10
There is no specific option to influence performance — unless you are using
the undocumented DSMO_DEBUG option. Remove DSMO_DEBUG from
your RMAN allocate channel command to reduce the trace overhead.
D.2.1 TDP for Oracle Version 2.2.0
In this section we discuss two options you need to consider.
D.2.1.1 Multi-buffering of data transfers
The multi-buffering option of data transfers is, like the COMPRESSION
parameter in the TSM client system option file, an option which is useful when
the network load is high and network performance is poor.
More details about multi buffering can be found in C.1.5, “Multi-buffering of
data transfers” on page 210.
We tested this option with different values — but in the end, we turned this
option off, because we had no network problems and we detected an
overhead in managing multiple buffers on a small system.
D.2.1.2 LAN-free data movement
TDP for Oracle is already enabled to use LAN-free data movement, this
should bring a significant performance improvement for backup and restore
operations.
However, the additional products to implement LAN free data movement were
not yet available on AIX or Sun Solaris at the time of writing.
On the Windows NT platform, we tested an unsupported version and
detected that backups are up to four times faster than the ordinary backups
going over TCP/IP.
Appendix D. Performance 225