[20180424]打开表空flashback on.txt
--//昨天测试完成,链接http://blog.itpub.net/267265/viewspace-2153207/,忘记设置flashback on;.
--//今天设置回来,顺便做一个笔记.
1.环境:
SYS@book> @ &r/ver1
PORT_STRING VERSION BANNER
------------------------------ -------------- --------------------------------------------------------------------------------
x86_64/Linux 2.4.xx 11.2.0.4.0 Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
SYS@book> select open_mode from v$database ;
OPEN_MODE
--------------------
READ WRITE
SYS@book> alter tablespace tea flashback on;
alter tablespace tea flashback on
*
ERROR at line 1:
ORA-01126: database must be mounted in this instance and not open in any instance
--//竟然不能在open状态设置flashback on;.
$ oerr ora 01126
01126, 00000, "database must be mounted in this instance and not open in any instance"
// *Cause: Obvious
// *Action:
2.测试在表空间offline下是否可行.
SYS@book> alter tablespace tea offline;
Tablespace altered.
SYS@book> alter tablespace tea flashback on;
alter tablespace tea flashback on
*
ERROR at line 1:
ORA-01126: database must be mounted in this instance and not open in any instance
SYS@book> alter tablespace tea online;
Tablespace altered.
--//看来必须在mount状态下调整.
SYS@book> startup mount
ORACLE instance started.
Total System Global Area 634732544 bytes
Fixed Size 2255792 bytes
Variable Size 197133392 bytes
Database Buffers 427819008 bytes
Redo Buffers 7524352 bytes
Database mounted.
SYS@book> alter tablespace tea flashback off;
Tablespace altered.
SYS@book> alter tablespace tea flashback on;
Tablespace altered.
SYS@book> select * from v$tablespace;
TS# NAME INC BIG FLA ENC
---------- -------- --- --- --- ---
0 SYSTEM YES NO YES
1 SYSAUX YES NO YES
2 UNDOTBS1 YES NO YES
4 USERS YES NO YES
3 TEMP NO NO YES
6 EXAMPLE YES NO YES
7 TEA YES NO YES
7 rows selected.
