AI 助理
备案控制台
开发者社区 数据库 文章 正文

[20180413]热备模式相关问题2.txt

2018-04-13 821
版权
版权声明：
本文内容由阿里云实名注册用户自发贡献，版权归原作者所有，阿里云开发者社区不拥有其著作权，亦不承担相应法律责任。具体规则请查看《 阿里云开发者社区用户服务协议》和 《阿里云开发者社区知识产权保护指引》。如果您发现本社区中有涉嫌抄袭的内容，填写 侵权投诉表单进行举报，一经查实，本社区将立刻删除涉嫌侵权内容。
简介： [20180413]热备模式相关问题2.txt --//上午测试热备模式相关问题,就是如果打开热备模式,如果中间的归档丢失,oracle在alter database end   backup ;时并没有应用日志.

[20180413]热备模式相关问题2.txt

--//上午测试热备模式相关问题,就是如果打开热备模式,如果中间的归档丢失,oracle在alter database end   backup ;时并没有应用日志.
--//虽然热备份模式文件头scn被"冻结",一定在某个地方记录的检查点的scn,这样在执行alter database end   backup ;时,写入新的scn
--//这样在恢复时才有可能跳过一些丢失的归档.

--//从某种意义讲,oracle这样设计有一定道理,假设某种情况打开热备模式,由于热备模式中断或者没有完成,忘记结束,如果在某次异常关闭时
--//需要恢复,并需要从"冻结"的scn号开始恢复.
--//测试看看这些相关信息保存在那里.

1.环境:
SCOTT@book> @ 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

2.测试1:
SYS@book> alter tablespace tea  begin   backup ;
Tablespace altered.

SYS@book> SELECT file#, CHECKPOINT_CHANGE#, CHECKPOINT_TIME,CREATION_CHANGE#  , RESETLOGS_CHANGE#,status, CHECKPOINT_COUNT,fuzzy,name,tablespace_name  FROM v$datafile_header where file# in (1,6);
FILE# CHECKPOINT_CHANGE# CHECKPOINT_TIME     CREATION_CHANGE# RESETLOGS_CHANGE# STATUS  CHECKPOINT_COUNT FUZ NAME                                               TABLESPACE_NAME
----- ------------------ ------------------- ---------------- ----------------- ------- ---------------- --- -------------------------------------------------- ------------------------------
    1        13277609065 2018-04-13 09:38:45                7            925702 ONLINE               937 YES /mnt/ramdisk/book/system01.dbf                     SYSTEM
    6        13277634716 2018-04-13 15:02:36      13276257767            925702 ONLINE               309 YES /mnt/ramdisk/book/tea01.dbf                        TEA

SYS@book> alter tablespace tea  end   backup ;
Tablespace altered.

SYS@book> SELECT file#, CHECKPOINT_CHANGE#, CHECKPOINT_TIME,CREATION_CHANGE#  , RESETLOGS_CHANGE#,status, CHECKPOINT_COUNT,fuzzy,name,tablespace_name  FROM v$datafile_header where file# in (1,6);
FILE# CHECKPOINT_CHANGE# CHECKPOINT_TIME     CREATION_CHANGE# RESETLOGS_CHANGE# STATUS  CHECKPOINT_COUNT FUZ NAME                                               TABLESPACE_NAME
----- ------------------ ------------------- ---------------- ----------------- ------- ---------------- --- -------------------------------------------------- ------------------------------
    1        13277609065 2018-04-13 09:38:45                7            925702 ONLINE               937 YES /mnt/ramdisk/book/system01.dbf                     SYSTEM
    6        13277634716 2018-04-13 15:02:36      13276257767            925702 ONLINE               310 YES /mnt/ramdisk/book/tea01.dbf                        TEA

--//数据文件6的scn=13277634716,没有变化,CHECKPOINT_COUNT增加.

3.测试2:
SYS@book> alter tablespace tea  begin   backup ;
Tablespace altered.

SYS@book> SELECT file#, CHECKPOINT_CHANGE#, CHECKPOINT_TIME,CREATION_CHANGE#  , RESETLOGS_CHANGE#,status, CHECKPOINT_COUNT,fuzzy,name,tablespace_name  FROM v$datafile_header where file# in (1,6);
FILE# CHECKPOINT_CHANGE# CHECKPOINT_TIME     CREATION_CHANGE# RESETLOGS_CHANGE# STATUS  CHECKPOINT_COUNT FUZ NAME                                               TABLESPACE_NAME
----- ------------------ ------------------- ---------------- ----------------- ------- ---------------- --- -------------------------------------------------- ------------------------------
    1        13277609065 2018-04-13 09:38:45                7            925702 ONLINE               937 YES /mnt/ramdisk/book/system01.dbf                     SYSTEM
    6        13277634864 2018-04-13 15:04:47      13276257767            925702 ONLINE               311 YES /mnt/ramdisk/book/tea01.dbf                        TEA

SYS@book> alter system checkpoint ;
System altered.

SYS@book> SELECT file#, CHECKPOINT_CHANGE#, CHECKPOINT_TIME,CREATION_CHANGE#  , RESETLOGS_CHANGE#,status, CHECKPOINT_COUNT,fuzzy,name,tablespace_name  FROM v$datafile_header where file# in (1,6);
FILE# CHECKPOINT_CHANGE# CHECKPOINT_TIME     CREATION_CHANGE# RESETLOGS_CHANGE# STATUS  CHECKPOINT_COUNT FUZ NAME                                               TABLESPACE_NAME
----- ------------------ ------------------- ---------------- ----------------- ------- ---------------- --- -------------------------------------------------- ------------------------------
    1        13277634878 2018-04-13 15:04:56                7            925702 ONLINE               938 YES /mnt/ramdisk/book/system01.dbf                     SYSTEM
    6        13277634864 2018-04-13 15:04:47      13276257767            925702 ONLINE               312 YES /mnt/ramdisk/book/tea01.dbf                        TEA

--//虽然数据文件6呃文件头scn被冻结13277634864,但是CHECKPOINT_COUNT依旧还是增加,也就是还是会改动文件头信息.

select 13277634878,trunc(13277634878/power(2,32)) scn_wrap,mod(13277634878,power(2,32))  scn_base from dual
13277634878     SCN_WRAP     SCN_BASE SCN_WRAP16 SCN_BASE16
------------ ------------ ------------ ---------- ----------
13277634878            3    392732990          3   1768a13e

SYS@book> @ &r/10to16 392732990
10 to 16 HEX      REVERSE16
----------------- -----------------------------------
000000001768a13e  0x3ea16817-00000000

--//通过bbed观察,可以发出检查点信息是记录在文件头中的.

BBED> p   dba 6,1 kcvfh.kcvfhbcp.kcvcpscn
struct kcvcpscn, 8 bytes                    @152
   ub4 kscnbas                              @152      0x1768a13e
   ub2 kscnwrp                              @156      0x0003

SYS@book> alter system checkpoint ;
System altered.

SYS@book> SELECT file#, CHECKPOINT_CHANGE#, CHECKPOINT_TIME,CREATION_CHANGE#  , RESETLOGS_CHANGE#,status, CHECKPOINT_COUNT,fuzzy,name,tablespace_name  FROM v$datafile_header where file# in (1,6);
FILE# CHECKPOINT_CHANGE# CHECKPOINT_TIME     CREATION_CHANGE# RESETLOGS_CHANGE# STATUS  CHECKPOINT_COUNT FUZ NAME                                                 TABLESPACE_NAME
----- ------------------ ------------------- ---------------- ----------------- ------- ---------------- --- ---------------------------------------------------- ------------------------------
    1        13277635895 2018-04-13 15:13:16                7            925702 ONLINE               939 YES /mnt/ramdisk/book/system01.dbf                       SYSTEM
    6        13277634864 2018-04-13 15:04:47      13276257767            925702 ONLINE               313 YES /mnt/ramdisk/book/tea01.dbf                          TEA

SYS@book> @ &r/10to16 13277635895
10 to 16 HEX      REVERSE16
----------------- -----------------------------------
000000031768a537  0x37a56817-03000000

BBED> p   dba 6,1 kcvfh.kcvfhbcp.kcvcpscn
struct kcvcpscn, 8 bytes                    @152
   ub4 kscnbas                              @152      0x1768a537
   ub2 kscnwrp                              @156      0x0003

--//可以发现数据文件6kcvfh.kcvfhbcp.kcvcpscn位置也会更新.这样在结束热备模式时,自动更新文件头.

SYS@book> alter tablespace tea  end   backup ;
Tablespace altered.

SYS@book> SELECT file#, CHECKPOINT_CHANGE#, CHECKPOINT_TIME,CREATION_CHANGE#  , RESETLOGS_CHANGE#,status, CHECKPOINT_COUNT,fuzzy,name,tablespace_name  FROM v$datafile_header where file# in (1,6);
FILE# CHECKPOINT_CHANGE# CHECKPOINT_TIME     CREATION_CHANGE# RESETLOGS_CHANGE# STATUS  CHECKPOINT_COUNT FUZ NAME                                                 TABLESPACE_NAME
----- ------------------ ------------------- ---------------- ----------------- ------- ---------------- --- ---------------------------------------------------- ------------------------------
    1        13277635895 2018-04-13 15:13:16                7            925702 ONLINE               939 YES /mnt/ramdisk/book/system01.dbf                       SYSTEM
    6        13277635895 2018-04-13 15:13:16      13276257767            925702 ONLINE               314 YES /mnt/ramdisk/book/tea01.dbf                          TEA

--//这也就很好解析为什么结束热备模式,从那里更新检查点.另外kcvfh.kcvfhbcp.kcvcpscn,里面的hb可以猜测表示hot backup的意思.

4.测试3:
--//做一个文件头转储看看:
SYS@book> alter tablespace tea  begin   backup ;
Tablespace altered.

SYS@book> SELECT file#, CHECKPOINT_CHANGE#, CHECKPOINT_TIME,CREATION_CHANGE#  , RESETLOGS_CHANGE#,status, CHECKPOINT_COUNT,fuzzy,name,tablespace_name  FROM v$datafile_header where file# in (1,6);
FILE# CHECKPOINT_CHANGE# CHECKPOINT_TIME     CREATION_CHANGE# RESETLOGS_CHANGE# STATUS  CHECKPOINT_COUNT FUZ NAME                                                 TABLESPACE_NAME
----- ------------------ ------------------- ---------------- ----------------- ------- ---------------- --- ---------------------------------------------------- ------------------------------
    1        13277635895 2018-04-13 15:13:16                7            925702 ONLINE               939 YES /mnt/ramdisk/book/system01.dbf                       SYSTEM
    6        13277637553 2018-04-13 15:39:15      13276257767            925702 ONLINE               317 YES /mnt/ramdisk/book/tea01.dbf                          TEA

SYS@book> alter system checkpoint ;
System altered.

SYS@book> SELECT file#, CHECKPOINT_CHANGE#, CHECKPOINT_TIME,CREATION_CHANGE#  , RESETLOGS_CHANGE#,status, CHECKPOINT_COUNT,fuzzy,name,tablespace_name  FROM v$datafile_header where file# in (1,6);
FILE# CHECKPOINT_CHANGE# CHECKPOINT_TIME     CREATION_CHANGE# RESETLOGS_CHANGE# STATUS  CHECKPOINT_COUNT FUZ NAME                                                 TABLESPACE_NAME
----- ------------------ ------------------- ---------------- ----------------- ------- ---------------- --- ---------------------------------------------------- ------------------------------
    1        13277637599 2018-04-13 15:39:56                7            925702 ONLINE               940 YES /mnt/ramdisk/book/system01.dbf                       SYSTEM
    6        13277637553 2018-04-13 15:39:15      13276257767            925702 ONLINE               318 YES /mnt/ramdisk/book/tea01.dbf                          TEA

select 13277637599,trunc(13277637599/power(2,32)) scn_wrap,mod(13277637599,power(2,32))  scn_base from dual
13277637599     SCN_WRAP     SCN_BASE SCN_WRAP16 SCN_BASE16
------------ ------------ ------------ ---------- ----------
13277637599            3    392735711          3   1768abdf

select 13277637553,trunc(13277637553/power(2,32)) scn_wrap,mod(13277637553,power(2,32))  scn_base from dual
13277637553     SCN_WRAP     SCN_BASE SCN_WRAP16 SCN_BASE16
------------ ------------ ------------ ---------- ----------
13277637553            3    392735665          3   1768abb1

SYS@book> alter session set events 'immediate trace name FILE_HDRS level 12';
Session altered.

--//检查转储:
DATA FILE #6:
  name #10: /mnt/ramdisk/book/tea01.dbf
creation size=5120 block size=8192 status=0xe head=10 tail=10 dup=1
tablespace 7, index=7 krfil=6 prev_file=0
unrecoverable scn: 0x0000.00000000 01/01/1988 00:00:00
Checkpoint cnt:318 scn: 0x0003.1768abb1 04/13/2018 15:39:15
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// -->  注这里的信息来之控制文件:http://blog.itpub.net/267265/viewspace-2136766/

Stop scn: 0xffff.ffffffff 04/13/2018 09:38:22
Creation Checkpointed at scn:  0x0003.17539de7 02/13/2017 15:09:58
thread:1 rba:(0x1d6.48.10)
enabled  threads:  01000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000
Offline scn: 0x0000.00000000 prev_range: 0
Online Checkpointed at scn:  0x0000.00000000
thread:0 rba:(0x0.0.0)
enabled  threads:  00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000
Hot Backup end marker scn: 0x0000.00000000
aux_file is NOT DEFINED
Plugged readony: NO
Plugin scnscn: 0x0000.00000000
Plugin resetlogs scn/timescn: 0x0000.00000000 01/01/1988 00:00:00
Foreign creation scn/timescn: 0x0000.00000000 01/01/1988 00:00:00
Foreign checkpoint scn/timescn: 0x0000.00000000 01/01/1988 00:00:00
Online move state: 0
V10 STYLE FILE HEADER:
    Compatibility Vsn = 186647552=0xb200400
    Db ID=1337401710=0x4fb7216e, Db Name='BOOK'
    Activation ID=0=0x0
    Control Seq=39840=0x9ba0, File size=5120=0x1400
    File Number=6, Blksiz=8192, File Type=3 DATA
Tablespace #7 - TEA  rel_fn:6
Creation   at   scn: 0x0003.17539de7 02/13/2017 15:09:58
Backup taken at scn: 0x0003.1768abb1 04/13/2018 15:39:15 thread:1
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
--//发出热备份模式的scn信息.
reset logs count:0x35711eb0 scn: 0x0000.000e2006
prev reset logs count:0x3121c97a scn: 0x0000.00000001
recovered at 04/13/2018 09:38:35
status:0x1 root dba:0x00000000 chkpt cnt: 318 ctl cnt:317
begin-hot-backup file size: 5120
Checkpointed at scn:  0x0003.1768abb1 04/13/2018 15:39:15
thread:1 rba:(0x2f7.a85b.10)
enabled  threads:  01000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000
Backup Checkpointed at scn:  0x0003.1768abdf 04/13/2018 15:39:56 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
--//备份过程中发出的检查点信息.
thread:1 rba:(0x2f7.a886.10)
enabled  threads:  01000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000
External cache id: 0x0 0x0 0x0 0x0
Absolute fuzzy scn: 0x0000.00000000
Recovery fuzzy scn: 0x0000.00000000 01/01/1988 00:00:00
Terminal Recovery Stamp  01/01/1988 00:00:00
Platform Information:    Creation Platform ID: 13
Current Platform ID: 13 Last Platform ID: 13
DUMP OF TEMP FILES: 1 files in database

5.继续测试,使用bbed修改看看:
--//使用bbed修改看看,减少kcvfh.kcvfhbcp.kcvcpscn-11看看.

SYS@book> shutdown abort ;
ORACLE instance shut down.

--//使用bbed修改:
BBED> p  /d  dba 6,1 kcvfh.kcvfhbcp.kcvcpscn
struct kcvcpscn, 8 bytes                    @152
   ub4 kscnbas                              @152      392735711
   ub2 kscnwrp                              @156      3

BBED> assign  dba 6,1 kcvfh.kcvfhbcp.kcvcpscn.kscnbas=392735700
Warning: contents of previous BIFILE will be lost. Proceed? (Y/N) y
ub4 kscnbas                                 @152      0x1768abd4

BBED> sum apply dba 6,1
Check value for File 6, Block 1:
current = 0xcf4c, required = 0xcf4c

BBED> p    dba 6,1 kcvfh.kcvfhbcp.kcvcpscn
struct kcvcpscn, 8 bytes                    @152
   ub4 kscnbas                              @152      0x1768abd4
   ub2 kscnwrp                              @156      0x0003

SYS@book> @ &r/16to10 31768abd4
16 to 10 DEC
------------
13277637588
--//减少到13277637588.

SYS@book> startup
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.
ORA-10873: file 6 needs to be either taken out of backup mode or media recovered
ORA-01110: data file 6: '/mnt/ramdisk/book/tea01.dbf'

SYS@book> SELECT file#, CHECKPOINT_CHANGE#, CHECKPOINT_TIME,CREATION_CHANGE#  , RESETLOGS_CHANGE#,status, CHECKPOINT_COUNT,fuzzy,name,tablespace_name  FROM v$datafile_header where file# in (1,6);
FILE# CHECKPOINT_CHANGE# CHECKPOINT_TIME     CREATION_CHANGE# RESETLOGS_CHANGE# STATUS  CHECKPOINT_COUNT FUZ NAME                                               TABLESPACE_NAME
----- ------------------ ------------------- ---------------- ----------------- ------- ---------------- --- -------------------------------------------------- ------------------------------
    1        13277637599 2018-04-13 15:39:56                7            925702 ONLINE               941 YES /mnt/ramdisk/book/system01.dbf                     SYSTEM
    6        13277637553 2018-04-13 15:39:15      13276257767            925702 ONLINE               318 YES /mnt/ramdisk/book/tea01.dbf                        TEA

SYS@book> alter tablespace tea  end   backup ;
Tablespace altered.

SYS@book> SELECT file#, CHECKPOINT_CHANGE#, CHECKPOINT_TIME,CREATION_CHANGE#  , RESETLOGS_CHANGE#,status, CHECKPOINT_COUNT,fuzzy,name,tablespace_name  FROM v$datafile_header where file# in (1,6);
FILE# CHECKPOINT_CHANGE# CHECKPOINT_TIME     CREATION_CHANGE# RESETLOGS_CHANGE# STATUS  CHECKPOINT_COUNT FUZ NAME                                               TABLESPACE_NAME
----- ------------------ ------------------- ---------------- ----------------- ------- ---------------- --- -------------------------------------------------- ------------------------------
    1        13277637599 2018-04-13 15:39:56                7            925702 ONLINE               941 YES /mnt/ramdisk/book/system01.dbf                     SYSTEM
    6        13277637588 2018-04-13 15:39:56      13276257767            925702 ONLINE               319 YES /mnt/ramdisk/book/tea01.dbf                        TEA

--//与前面修改一致,也验证了自己的判断.

6.继续测试,是否在热备份模式可以offline表空间:

SYS@book> alter database open ;
Database altered.

SYS@book> alter tablespace tea  begin   backup ;
Tablespace altered.

SYS@book> SELECT file#, CHECKPOINT_CHANGE#, CHECKPOINT_TIME,CREATION_CHANGE#  , RESETLOGS_CHANGE#,status, CHECKPOINT_COUNT,fuzzy,name,tablespace_name  FROM v$datafile_header where file# in (1,6);
FILE# CHECKPOINT_CHANGE# CHECKPOINT_TIME     CREATION_CHANGE# RESETLOGS_CHANGE# STATUS  CHECKPOINT_COUNT FUZ NAME                                               TABLESPACE_NAME
----- ------------------ ------------------- ---------------- ----------------- ------- ---------------- --- -------------------------------------------------- ------------------------------
    1        13277658196 2018-04-13 15:56:09                7            925702 ONLINE               944 YES /mnt/ramdisk/book/system01.dbf                     SYSTEM
    6        13277658833 2018-04-13 15:59:49      13276257767            925702 ONLINE               329 YES /mnt/ramdisk/book/tea01.dbf                        TEA

SYS@book> alter tablespace tea  offline;
alter tablespace tea  offline
*
ERROR at line 1:
ORA-01150: cannot prevent writes - file 6 has online backup set
ORA-01110: data file 6: '/mnt/ramdisk/book/tea01.dbf'

$ oerr ora 01150
01150, 00000, "cannot prevent writes - file %s has online backup set"
// *Cause: An attempt to make a tablespace read only or offline normal found
//          that an online backup is still in progress. It will be necessary
//          to write the file header to end the backup, but that would not
//          be allowed if this command succeeded.
// *Action: End the backup of the offending tablespace and retry this command.

SYS@book> alter tablespace tea  offline immediate ;
Tablespace altered.

--//强制ok.

SYS@book> alter tablespace tea  online;
alter tablespace tea  online
*
ERROR at line 1:
ORA-01113: file 6 needs media recovery
ORA-01110: data file 6: '/mnt/ramdisk/book/tea01.dbf'

SYS@book> select * from v$backup where file# in (1,6);
FILE# STATUS                  CHANGE# TIME
----- ------------------ ------------ -------------------
    1 NOT ACTIVE          13277525910 2018-04-13 09:03:44
    6 NOT ACTIVE          13277658833 2018-04-13 15:59:49

--//热备模式已经关闭.

--//总结:
--//虽然热备份已经不常用,也不推荐使用.还是佩服oracle设计时的考虑周全,在发出检查点时记录最新的scn号数据文件中即使在热备份模式下.
--//这样在恢复时减少使用归档的数量.

文章标签：
数据库管理
关系型数据库
Oracle
Linux
lfreeali
目录
相关文章
德哥
|
弹性计算 网络协议 容灾
PostgreSQL 时间点恢复（PITR）在异步流复制主从模式下，如何避免主备切换后PITR恢复(备库、容灾节点、只读节点)走错时间线(timeline , history , partial , restore_command , recovery.conf)
标签 PostgreSQL , 恢复 , 时间点恢复 , PITR , restore_command , recovery.conf , partial , history , 任意时间点恢复 , timeline , 时间线 背景 政治正确非常重要，对于数据库来说亦如此，一个基于流复制的HA架构的集群，如果还有一堆只读节点，当HA集群发生了主备切换后，这些只读节点能否与新的主节点保持
德哥
1807 0
遥想公瑾
|
关系型数据库 网络安全 数据库
PGPool-II+PG流复制实现HA主备切换
基于PG的流复制能实现热备切换，但是是要手动建立触发文件实现，对于一些HA场景来说，需要当主机down了后，备机自动切换，经查询资料知道pgpool-II可以实现这种功能。
遥想公瑾
3032 0
eric0435
|
SQL 调度 数据库
DM7数据复制之模式级复制
eric0435
1044 0
lfreeali
|
Oracle 关系型数据库 数据库
[20180413]热备模式相关问题.txt
[20180413]热备模式相关问题.txt --//昨天遇到开启热备模式的相关问题,一个不是很重要的数据库,估计有人开启了热备模式,异常关机,打开报错, --//自己在测试环境重复测试: 1.
lfreeali
1027 0
科技小先锋
|
Oracle 关系型数据库
物理DG因为主库新建数据文件同步到从库后从库磁盘空间不足处理
科技小先锋
1263 0
lfreeali
|
Oracle 关系型数据库 数据库
[20171031]rman备份压缩模式.txt
[20171031]rman备份压缩模式.txt --//测试rman备份压缩模式,那种效果好,我记忆里选择medium在备份时间和备份文件大小综合考虑最佳. --//还是通过脚本测试: 1.
lfreeali
1238 0
lfreeali
|
SQL 测试技术 数据库
[20170825]11G备库启用DRCP连接3.txt
[20170825]11G备库启用DRCP连接3.txt --//昨天测试了11G备库启用DRCP连接,要设置alter system set audit_trail=none scope=spfile ; --//参考链接http://blog.
lfreeali
989 0
lfreeali
|
SQL Oracle 关系型数据库
[20170824]11G备库启用DRCP连接.txt
[20170824]11G备库启用DRCP连接.txt --//参考链接: http://blog.itpub.net/267265/viewspace-2099397/ blogs.
lfreeali
1249 0
lfreeali
|
Oracle 关系型数据库
[20170725]关于备份集与备份片.txt
[20170725]关于备份集与备份片.txt --//以前学习rman对于备份集与备份片这个概念也不是很清晰. --//备份片(BACKUPPIECE)表示一个由RMAN产生备份的文件.
lfreeali
862 0
lfreeali
|
SQL Oracle 关系型数据库
[20170623]利用传输表空间恢复部分数据.txt
[20170623]利用传输表空间恢复部分数据.txt --//昨天我测试使用传输表空间+dblink,上午补充测试发现表空间设置只读才能执行impdp导入原数据,这个也很好理解.
lfreeali
935 0