oerr rman 8591
8591, 3, "WARNING: invalid archived log deletion policy"
// *Cause: An invalid ARCHIVELOG DELETION POLICY was supplied. The archived
// log deletion policy was APPLIED but there was no mandatory
// archived log destinations.
// *Action: One of the following:
// 1) Change archived log deletion policy using CONFIGURE command
// 2) Make one or more of standby destination as MANDATORY.
old RMAN configuration parameters:
CONFIGURE ARCHIVELOG DELETION POLICY TO SHIPPED TO STANDBY;
RMAN configuration parameters are successfully reset to default value