Create restore point on the database

mkdir -p /u01/test/FLASH_AREA

 -- turn on flashback- database in archive log mode

 alter system set db_recovery_file_dest=' /u01/test/FLASH_AREA' scope =spfile;
alter system set db_recovery_file_dest_size=50G scope =spfile;

 shutdown 
startup
show parameter db_flashback_retention_target
alter database flashback on ;

 SELECT flashback_on, log_mode FROM v$database;
SELECT estimated_flashback_size FROM v$flashback_database_log;
select (dd.SPACE_LIMIT-dd.SPACE_USED +dd.SPACE_RECLAIMABLE)/1024/1024/1024 size_avail from v$recovery_file_dest dd;
SELECT * FROM v$flashback_database_stat;



start release
-------------------------------------------
SELECT flashback_on, log_mode FROM v$database;
alter database flashback on;
create restore point Restore_upgrade guarantee  flashback database;
after finish

 Select name, preserved from v$restore_point;
drop restore point Restore_upgard
alter database flashback off;
SELECT flashback_on, log_mode FROM v$database;

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