Oracle Database Discussions

Hi.

I have a problem with RMAN. When i try to allocate a channel, for example on disk, with the following statement:

allocate channel c1 type disk;

I get the following error:

RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-00558: error encountered while parsing input commands
RMAN-01005: syntax error: found "identifier": expecting one of: "for"
RMAN-01008: the bad identifier was: c1
RMAN-01007: at line 1 column 18 file: standard input

I have checked many time the statement syntax in the pdf oracle book, and it is correct.
I can only open channels for "maintenace" or for "delete" but not for "backup" or "restore"

The following statements works fine:

allocate channel for delete type disk;
allocate channel for maintenance type disk;

has someone an explanation for this anomaly?

Thanks.