When u use Rman nocatalog Controlfile stores information about ur backups through Rman. This information regarding
ur bakup sets,back copy etc will increase as u take bake up day by day.This information is stored in reusale section of
ur control file.

Now Control_file_record_keep_time Parameter applies to reusale section.

It specifies minimum age in days that a records must have before it can be reused.

Ex. Control_file_record_keep_time=3
Then records in reusale section is not used for 3 days.
Any new records for 3 days will be appended in reusable section of control file, but after 3 days these record will be reused if necessary.

And u have to take bakup of ur control file atleaset every 3 days.


Kuckoo