Control file reusable section contain rman information what is this non reusable section contains......is it....ckpt and scn informatio needed for recovery..?
There is One parameter CONTROL_FILE_RECORD_KEEP_TIME defines dat after this much time backup and recovery information will be overwritten. If before this time, new information is added, then controlfile grows in size upto max OS limit. This portion is resuable part.
Yes, CHKPTing or SCN info, log sequence,info abt datafiles and redo files,etc form the non reusable part.