Connection lost contact error

Question

Hello,
I get the following error:
RMAN-06900: WARNING: unable to generate V$RMAN_STATUS or V$RMAN_OUTPUT row
RMAN-06901: WARNING: disabling update of the V$RMAN_STATUS and V$RMAN_OUTPUT rows
ORACLE error from target database:
ORA-03135: connection lost contact
by a full database backup command: backup as copy incremental level 0 database tag level_0;
The backup goes on, further datafiles are copied.
Than the backup ends with this error:
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-00601: fatal error in recovery manager
RMAN-03004: fatal error during execution of command
The first error seems to be a timeout problem so I modified the parameters in the sqlnet.ora.
current settings:
SQLNET.EXPIRE_TIME=5
SQLNET.INBOUND_CONNECT_TIMEOUT=300
SQLNET.SEND_TIMEOUT=300
SQLNET.RECV_TIMEOUT=300
The modifications haven't solved the error.
The second error is to generally and I don't know, if this error is in relationship to the first error. Where can I find more information about the second error on my database server?
DB version 10gR2 on RedHat Linux ES4
Best regards,
Mathias

Answer 1

Hi Tycho,
I suggest that the backup causes the high load, because at normal operation time the load is between 0.2 and 2.
I use no compression and only one channel.
RMAN configuration parameters are:
CONFIGURE RETENTION POLICY TO REDUNDANCY 3;
CONFIGURE BACKUP OPTIMIZATION OFF; # default
CONFIGURE DEFAULT DEVICE TYPE TO DISK; # default
CONFIGURE CONTROLFILE AUTOBACKUP ON;
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '%F'; # default
CONFIGURE DEVICE TYPE DISK BACKUP TYPE TO COMPRESSED BACKUPSET PARALLELISM 1;
CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE ARCHIVELOG BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE MAXSETSIZE TO UNLIMITED; # default
CONFIGURE ENCRYPTION FOR DATABASE OFF; # default
CONFIGURE ENCRYPTION ALGORITHM 'AES128'; # default
CONFIGURE ARCHIVELOG DELETION POLICY TO NONE; # default
backup command:
allocate channel c1 type disk format '...';
backup as copy incremental level 0 database tag level_0;
I can retry everytime, but I have no idea what I can configure to get a better result (no errors).
Means 'CONFIGURE DEVICE TYPE DISK BACKUP TYPE TO COMPRESSED BACKUPSET PARALLELISM 1;' compression is used for my backup command?
Regards,
Mathias