Regular Procedures › CA Datacom/AD Environment Maintenance › Backup and Recovery Considerations › Recovery File (RXX)

Recovery File (RXX)

The Recovery File (RXX) is a sequential history file of logged maintenance records spilled from the LXX. The RXX is always (except sometimes in z/OS) a tape file that allows you to perform forward recovery for a database that has been restored from a backup. CA Datacom is installed with the RXX option effectively turned off. The creation of the RXX is determined by the CA Datacom/DB LOGRCV MUF startup option.

We recommend you specify the creation of an RXX by coding NO (that is, no dedicated tape drive for RXX) for the CA Datacom/DB LOGRCV MUF startup option. Specifying LOGRCV NO creates an RXX by running a SPILL job from the LXX. With LOGRCV NO specified, the RXX is neither active nor opened during CA Datacom/AD execution. This is the most commonly preferred LOGRCV option.

The other options for LOGRCV are NEVER and YES.

YES specifies active Recovery File. A dedicated tape drive is used for the Recovery File. If you specify the MUF startup option LOGRCV as YES, you are not allowed to specify the MUFPLEX MUF startup option.

NEVER specifies the Recovery File does not exist. NEVER is the value assigned to this parameter during installation. You should carefully evaluate the impact of specifying this because, with a LOGRCV value of NEVER, recovery is not possible and transaction backout can be compromised. Remember that this option affects all databases, including the CA-required databases such as CA Datacom Datadictionary and the DDD.

Note: There is no default for LOGRCV if you code the LOGRCV option. However, if you do not specify this option, the default is an Inactive Recovery File.)

Because log records are not automatically spilled with LOGRCV NO, to write spillable records to the RXX you must mount the RXX tape and run the SPILL function of DBUTLTY. If one or more contiguous blocks are spillable, they are all spilled. Create a spill job using the DBUTLTY SPILLOPT SPILL function as detailed in the CA Datacom/DB DBUTLTY Reference Guide.

AD14LXXS is a sample provided on the install.

Note: A tape generation data set works very well for the RXX. However, when combining RXX GDG data sets, be sure to manually concatenate them in reverse order (such as, oldest to most current).