The maximum control file size is 20000 database blocks. If DB_BLOCK_SIZE equals 8192, then the maximum control file size is 156 MB
.7.4.2 Specifying the Reuse of Records in the Control File
The CONTROL_FILE_RECORD_KEEP_TIME initialization parameter specifies the minimum number of days that must pass before a reusable record in the control file can be reused. Setting this parameter appropriately prevents redo transport services from overwriting a reusable record in the control file and ensures redo information remains available on the standby database:
Set CONTROL_FILE_RECORD_KEEP_TIME to a value that allows all on disk backup information to be retained in the control file. CONTROL_FILE_RECORD_KEEP_TIME specifies the number of days that records are kept within the control file before becoming a candidate for reuse.
Set CONTROL_FILE_RECORD_KEEP_TIME to a value slightly longer than the oldest backup file that you intend to keep on disk, as determined by the size of the backup area.
For example, if the backup area is sized to maintain two full backups that are taken every 7 days, as well as daily incremental backups and archived redo log files, then set CONTROL_FILE_RECORD_KEEP_TIME to a value of 21 or 30. Records older than this will be reused. However, the backup metadata will still be available in the RMAN recovery catalog.
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