oracle--ORA-38760

01，ORA-38760: This database instance failed to turn on flashback

　　

02，问题处理思路

　　 第一步：查看日志文件

　　　　查看这次启动的时候alter日志对其的描述，查看报错信息

　　　　日志文件地址：

 SQL> show parameter BACKGROUND_DUMP_DEST;

NAME                     TYPE     VALUE
------------------------------------ ----------- ------------------------------
background_dump_dest             string     /u01/app/oracle/diag/rdbms/oracle01_oracle01/oracle01/trace

　　可能：空间不足出现的闪回去问题

报错中出现：
ORA-19815: WARNING: db_recovery_file_dest_size of 4039114752 bytes is 99.92% used, and has 3282432 

查看空间剩余：
SQL>  col file_type format A20;
SQL> set linesize 120 pagesize 100;
SQL> select * from v$flash_recovery_area_usage;

FILE_TYPE         PERCENT_SPACE_USED PERCENT_SPACE_RECLAIMABLE NUMBER_OF_FILES
-------------------- ------------------ ------------------------- ---------------
CONTROL FILE                  0             0        0
REDO LOG                      0             0        0
ARCHIVED LOG                  0             0        0
BACKUP PIECE                  0             0        0
IMAGE COPY                    0             0        0
FLASHBACK LOG                17.58         7.81      18
FOREIGN ARCHIVED LOG          0             0        0

7 rows selected.

空间
SQL>  select * from v$flashback_database_log ;

OLDEST_FLASHBACK_SCN OLDEST_FL RETENTION_TARGET FLASHBACK_SIZE ESTIMATED_FLASHBACK_SIZE
-------------------- --------- ---------------- -------------- ------------------------
        21263778 05-JUL-19           2880      943718400              421134336

当 PERCENT_SPACE_RECLAIMABL 和 ESTIMATED_FLASHBACK_SIZE 为零就不足啦

　　解决方法：

关闭闪回点
alter database flashback off;
再次启动数据库
SQL> alter database open;

假如还是报错：
alter database open
*
ERROR at line 1:
ORA-38760: This database instance failed to turn on flashback database

查看恢复检查点
select * from v$restore_point;
SCN DATABASE_INCARNATION# GUA STORAGE_SIZE TIME                                RESTORE_POINT_TIME        PRE NAME
---------- --------------------- --- ------------ ----------------------------------- ------------------------- --- --------------------
   1187867                     2 YES   3056812032 04-OCT-14 02.41.43.000000000 AM                               YES MACLEAN_ROLLBACK
然后直接删除闪回点
SQL> drop restore point MACLEAN_ROLLBACK;

　　

　　

01，ORA-38760: This database instance failed to turn on flashback

01，ORA-38760：此数据库实例无法启用闪回