rman初级知识（读书笔记）

原創 cindy-berry 2020-02-20 13:10

《三思笔记》--rman

进入rman，我自己本地就一个实例，那么进入rman有两种方式

[oracle@cindy ~]$ rman target /

Recovery Manager: Release 11.2.0.3.0 - Production on Sat Aug 30 04:55:59 2014

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.

connected to target database: ORA11G (DBID=4252637343)

RMAN> exit


Recovery Manager complete.

这种等价于下面 

[oracle@cindy ~]$ rman

Recovery Manager: Release 11.2.0.3.0 - Production on Sat Aug 30 04:57:03 2014

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.

RMAN> connect target /

connected to target database: ORA11G (DBID=4252637343)

如果想暂时退出rman进入操作系统，则如下 

RMAN> host;

[oracle@cindy ~]$ exit
exit
host command complete

RMAN>

需要批处理一些命令的时候，可以将命令放在run{}中，保存为一个脚本，直接调用

-------------------------------------------------华丽的分割线------------------------上面是简单的操作方式----------------------------------------------

下面开始介绍备份的初级演练

1、整库的备份

只需要一条命令，可以同format参数来定义备份片段的路径（绝对路径）

建一个文件夹用来放备份的内容

RMAN> host;

[oracle@cindy ~]$ pwd
/u01/oracle
[oracle@cindy ~]$ rmdir rman_test
[oracle@cindy ~]$ ls
app  autorman  database  Desktop  ldr_case1.ctl  ldr_case1.log  p10404530_112030_Linux-x86-64_1of7.zip  p10404530_112030_Linux-x86-64_2of7.zip  rmanjiaoben
[oracle@cindy ~]$ mkdir rman_test
[oracle@cindy ~]$ exit
exit
host command complete

RMAN> backup database format '/u01/oracle/rman_test/bak_%U';

Starting backup at 30-AUG-14
using channel ORA_DISK_1
channel ORA_DISK_1: starting full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
input datafile file number=00001 name=/u02/oradata/ora11g/system01.dbf
input datafile file number=00002 name=/u02/oradata/ora11g/sysaux01.dbf
input datafile file number=00005 name=/u02/oradata/ora11g/example01.dbf
input datafile file number=00003 name=/u02/oradata/ora11g/undotbs01.dbf
input datafile file number=00004 name=/u02/oradata/ora11g/users01.dbf
channel ORA_DISK_1: starting piece 1 at 30-AUG-14
channel ORA_DISK_1: finished piece 1 at 30-AUG-14
piece handle=/u01/oracle/rman_test/bak_15ph7hli_1_1 tag=TAG20140830T051426 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:03:48
Finished backup at 30-AUG-14

Starting Control File and SPFILE Autobackup at 30-AUG-14
piece handle=/u02/rmanbak/c-4252637343-20140830-01 comment=NONE
Finished Control File and SPFILE Autobackup at 30-AUG-14

查看创建的全库备份，用list命令查看 

RMAN> list backup of database;


List of Backup Sets
===================
BS Key  Type LV Size       Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
36      Full    1.21G      DISK        00:03:43     30-AUG-14      
        BP Key: 36   Status: AVAILABLE  Compressed: NO  Tag: TAG20140830T051426
        Piece Name: /u01/oracle/rman_test/bak_15ph7hli_1_1
  List of Datafiles in backup set 36
  File LV Type Ckp SCN    Ckp Time  Name
  ---- -- ---- ---------- --------- ----
  1       Full 1497515    30-AUG-14 /u02/oradata/ora11g/system01.dbf
  2       Full 1497515    30-AUG-14 /u02/oradata/ora11g/sysaux01.dbf
  3       Full 1497515    30-AUG-14 /u02/oradata/ora11g/undotbs01.dbf
  4       Full 1497515    30-AUG-14 /u02/oradata/ora11g/users01.dbf
  5       Full 1497515    30-AUG-14 /u02/oradata/ora11g/example01.dbf

RMAN>
明显通过看piece name即可看到备份集所在的位置

2、表空间的备份

（备份USERS表空间）
建一个目录用来放表空间备份的东西，大致步骤同上

RMAN> host;

[oracle@cindy ~]$ cd /u01/oracle/rman_test
[oracle@cindy rman_test]$ ls
bak_15ph7hli_1_1
[oracle@cindy rman_test]$ mkdir rman_tablespace
[oracle@cindy rman_test]$ ls
bak_15ph7hli_1_1  rman_tablespace
[oracle@cindy rman_test]$ exit
exit
host command complete

RMAN> backup tablespace users format '/u01/oracle/rman_test/rman_tablespace/tbls_%U';

Starting backup at 30-AUG-14
using channel ORA_DISK_1
channel ORA_DISK_1: starting full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
input datafile file number=00004 name=/u02/oradata/ora11g/users01.dbf
channel ORA_DISK_1: starting piece 1 at 30-AUG-14
channel ORA_DISK_1: finished piece 1 at 30-AUG-14
piece handle=/u01/oracle/rman_test/rman_tablespace/tbls_17ph7irl_1_1 tag=TAG20140830T053445 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:07
Finished backup at 30-AUG-14

Starting Control File and SPFILE Autobackup at 30-AUG-14
piece handle=/u02/rmanbak/c-4252637343-20140830-02 comment=NONE
Finished Control File and SPFILE Autobackup at 30-AUG-14

RMAN> list backup of tablespace users;


List of Backup Sets
===================
BS Key  Type LV Size       Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
36      Full    1.21G      DISK        00:03:43     30-AUG-14      
        BP Key: 36   Status: AVAILABLE  Compressed: NO  Tag: TAG20140830T051426
        Piece Name: /u01/oracle/rman_test/bak_15ph7hli_1_1
  List of Datafiles in backup set 36
  File LV Type Ckp SCN    Ckp Time  Name
  ---- -- ---- ---------- --------- ----
  4       Full 1497515    30-AUG-14 /u02/oradata/ora11g/users01.dbf

BS Key  Type LV Size       Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
38      Full    24.87M     DISK        00:00:06     30-AUG-14      
        BP Key: 38   Status: AVAILABLE  Compressed: NO  Tag: TAG20140830T053445
        Piece Name: /u01/oracle/rman_test/rman_tablespace/tbls_17ph7irl_1_1
  List of Datafiles in backup set 38
  File LV Type Ckp SCN    Ckp Time  Name
  ---- -- ---- ---------- --------- ----
  4       Full 1498329    30-AUG-14 /u02/oradata/ora11g/users01.dbf
显然，可以看到，USERS表空间存在两份备份，

一份目录是

/u01/oracle/rman_test/bak_15ph7hli_1_1

一份目录是

/u01/oracle/rman_test/rman_tablespace/tbls_17ph7irl_1_1
是因为在前面执行过全库备份，所以这里，可以删除一份备份，命令如下 

RMAN> delete backupset 38;

using channel ORA_DISK_1

List of Backup Pieces
BP Key  BS Key  Pc# Cp# Status      Device Type Piece Name
------- ------- --- --- ----------- ----------- ----------
38      38      1   1   AVAILABLE   DISK        /u01/oracle/rman_test/rman_tablespace/tbls_17ph7irl_1_1

Do you really want to delete the above objects (enter YES or NO)? 

Do you really want to delete the above objects (enter YES or NO)? Y
deleted backup piece
backup piece handle=/u01/oracle/rman_test/rman_tablespace/tbls_17ph7irl_1_1 RECID=38 STAMP=856935285
Deleted 1 objects

3、数据文件的备份

有两种方式指定数据文件的名称，即数据文件的详细路径和file_id，这两个信息可以从数据字典DBA_DATA_FILES中查到，也可以通过观察，在前面的全库备份中，已经显示了数据文件名和序号

备份users表空间的数据文件

基本操作也同上

RMAN> host;

[oracle@cindy ~]$ cd /u01/oracle/rman_test
[oracle@cindy rman_test]$ ls
bak_15ph7hli_1_1  rman_tablespace
[oracle@cindy rman_test]$ mkdir rman_datafile
[oracle@cindy rman_test]$ ls
bak_15ph7hli_1_1  rman_datafile  rman_tablespace
[oracle@cindy rman_test]$ exit
exit
host command complete
RMAN> backup datafile 4 format'/u01/oracle/rman_test/rman_datafile/bak_%U';

Starting backup at 30-AUG-14
using channel ORA_DISK_1
channel ORA_DISK_1: starting full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
input datafile file number=00004 name=/u02/oradata/ora11g/users01.dbf
channel ORA_DISK_1: starting piece 1 at 30-AUG-14
channel ORA_DISK_1: finished piece 1 at 30-AUG-14
piece handle=/u01/oracle/rman_test/rman_datafile/bak_1aph7k6t_1_1 tag=TAG20140830T055749 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:07
Finished backup at 30-AUG-14

Starting Control File and SPFILE Autobackup at 30-AUG-14
piece handle=/u02/rmanbak/c-4252637343-20140830-03 comment=NONE
Finished Control File and SPFILE Autobackup at 30-AUG-14
这里的4可以替换成'/u02/oradata/ora11g/users01.dbf'
RMAN> list backup of datafile 4;


List of Backup Sets
===================
BS Key  Type LV Size       Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
36      Full    1.21G      DISK        00:03:43     30-AUG-14      
        BP Key: 36   Status: AVAILABLE  Compressed: NO  Tag: TAG20140830T051426
        Piece Name: /u01/oracle/rman_test/bak_15ph7hli_1_1
  List of Datafiles in backup set 36
  File LV Type Ckp SCN    Ckp Time  Name
  ---- -- ---- ---------- --------- ----
  4       Full 1497515    30-AUG-14 /u02/oradata/ora11g/users01.dbf

BS Key  Type LV Size       Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
40      Full    24.87M     DISK        00:00:06     30-AUG-14      
        BP Key: 40   Status: AVAILABLE  Compressed: NO  Tag: TAG20140830T055749
        Piece Name: /u01/oracle/rman_test/rman_datafile/bak_1aph7k6t_1_1
  List of Datafiles in backup set 40
  File LV Type Ckp SCN    Ckp Time  Name
  ---- -- ---- ---------- --------- ----
  4       Full 1499208    30-AUG-14 /u02/oradata/ora11g/users01.dbf

4、控制文件的备份

操作步骤即命令也同上类似

RMAN> host;

[oracle@cindy ~]$ cd /u01/oracle/rman_test
[oracle@cindy rman_test]$ ls
bak_15ph7hli_1_1  rman_datafile  rman_tablespace
[oracle@cindy rman_test]$ mkdir rman_ctl
[oracle@cindy rman_test]$ ls
bak_15ph7hli_1_1  rman_ctl  rman_datafile  rman_tablespace
[oracle@cindy rman_test]$ exit
exit
host command complete
RMAN> backup current controlfile format '/u01/oracle/rman_test/rman_ctl/bak_%U';

Starting backup at 30-AUG-14
using channel ORA_DISK_1
channel ORA_DISK_1: starting full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
including current control file in backup set
channel ORA_DISK_1: starting piece 1 at 30-AUG-14
channel ORA_DISK_1: finished piece 1 at 30-AUG-14
piece handle=/u01/oracle/rman_test/rman_ctl/bak_1dph7m0t_1_1 tag=TAG20140830T062845 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:03
Finished backup at 30-AUG-14

Starting Control File and SPFILE Autobackup at 30-AUG-14
piece handle=/u02/rmanbak/c-4252637343-20140830-04 comment=NONE
Finished Control File and SPFILE Autobackup at 30-AUG-14

在执行backup命令的时候，可以指定include current controlfile子句

例如backuo database include current controlfile;

不仅限于database，执行backup命令备份任何文件时都可以指定include current controlfile子句，甚至是backup current controlfile

如

RMAN> backup current controlfile include current controlfile format '/u01/oracle/rman_test/rman_ctl/bak_%U';

Starting backup at 30-AUG-14
using channel ORA_DISK_1
channel ORA_DISK_1: starting full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
including current control file in backup set
channel ORA_DISK_1: starting piece 1 at 30-AUG-14
channel ORA_DISK_1: finished piece 1 at 30-AUG-14
piece handle=/u01/oracle/rman_test/rman_ctl/bak_1hph7m9o_1_1 tag=TAG20140830T063328 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:03
Finished backup at 30-AUG-14

Starting Control File and SPFILE Autobackup at 30-AUG-14
piece handle=/u02/rmanbak/c-4252637343-20140830-06 comment=NONE
Finished Control File and SPFILE Autobackup at 30-AUG-14

RMAN> host;

[oracle@cindy ~]$ cd /u01/oracle/rman_test/rman_ctl
[oracle@cindy rman_ctl]$ ls
bak_1hph7m9o_1_1
[oracle@cindy rman_ctl]$ exit
exit
host command complete

RMAN> list backup of controlfile;

5、归档文件的备份

rman中备份归档日志文件有两种方式

（1）利用backup archivelog命令备份

RMAN> host;

[oracle@cindy ~]$ cd /u01/oracle/rman_test
[oracle@cindy rman_test]$ ls
bak_15ph7hli_1_1  rman_ctl  rman_datafile  rman_tablespace
[oracle@cindy rman_test]$ mkdir rman_archive
[oracle@cindy rman_test]$ ls
bak_15ph7hli_1_1  rman_archive  rman_ctl  rman_datafile  rman_tablespace
[oracle@cindy rman_test]$ exit
exit
host command complete
RMAN>  backup archivelog all format '/u01/oracle/rman_test/rman_archive/bak_%U';

Starting backup at 30-AUG-14
current log archived
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=59 device type=DISK
channel ORA_DISK_1: starting archived log backup set
channel ORA_DISK_1: specifying archived log(s) in backup set
input archived log thread=1 sequence=37 RECID=30 STAMP=856917213
input archived log thread=1 sequence=38 RECID=31 STAMP=856939417
input archived log thread=1 sequence=39 RECID=32 STAMP=856939529
input archived log thread=1 sequence=40 RECID=33 STAMP=856939605
input archived log thread=1 sequence=41 RECID=34 STAMP=856939761
channel ORA_DISK_1: starting piece 1 at 30-AUG-14
channel ORA_DISK_1: finished piece 1 at 30-AUG-14
piece handle=/u01/oracle/rman_test/rman_archive/bak_1nph7n7i_1_1 tag=TAG20140830T064921 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:07
Finished backup at 30-AUG-14

Starting Control File and SPFILE Autobackup at 30-AUG-14
piece handle=/u02/rmanbak/c-4252637343-20140830-08 comment=NONE
Finished Control File and SPFILE Autobackup at 30-AUG-14

backup archivelog命令比较灵活，all是指备份当前所有可访问到的归档文件，还可以通过until,scn,time,sequence等参数灵活指定要备份的归档区间

（2）执行backup命令时指定plus archiverlog子句

RMAN> backup current controlfile plus archivelog format '/u01/oracle/rman_test/rman_archive/plus_%U';


Starting backup at 30-AUG-14
current log archived
using channel ORA_DISK_1
channel ORA_DISK_1: starting archived log backup set
channel ORA_DISK_1: specifying archived log(s) in backup set
input archived log thread=1 sequence=37 RECID=30 STAMP=856917213
input archived log thread=1 sequence=38 RECID=31 STAMP=856939417
input archived log thread=1 sequence=39 RECID=32 STAMP=856939529
input archived log thread=1 sequence=40 RECID=33 STAMP=856939605
input archived log thread=1 sequence=41 RECID=34 STAMP=856939761
input archived log thread=1 sequence=42 RECID=35 STAMP=856940080
channel ORA_DISK_1: starting piece 1 at 30-AUG-14
channel ORA_DISK_1: finished piece 1 at 30-AUG-14
piece handle=/u01/oracle/rman_test/rman_archive/plus_1pph7nhg_1_1 tag=TAG20140830T065440 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:03
Finished backup at 30-AUG-14

Starting backup at 30-AUG-14
using channel ORA_DISK_1
channel ORA_DISK_1: starting full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
including current control file in backup set
channel ORA_DISK_1: starting piece 1 at 30-AUG-14
channel ORA_DISK_1: finished piece 1 at 30-AUG-14
piece handle=/u01/oracle/app/oracle/fast_recovery_area/ORA11G/backupset/2014_08_30/o1_mf_ncnnf_TAG20140830T065444_b0215o57_.bkp tag=TAG20140830T065444 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:03
Finished backup at 30-AUG-14

Starting backup at 30-AUG-14
current log archived
using channel ORA_DISK_1
channel ORA_DISK_1: starting archived log backup set
channel ORA_DISK_1: specifying archived log(s) in backup set
input archived log thread=1 sequence=43 RECID=36 STAMP=856940088
channel ORA_DISK_1: starting piece 1 at 30-AUG-14
channel ORA_DISK_1: finished piece 1 at 30-AUG-14
piece handle=/u01/oracle/rman_test/rman_archive/plus_1rph7nho_1_1 tag=TAG20140830T065448 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01
Finished backup at 30-AUG-14

Starting Control File and SPFILE Autobackup at 30-AUG-14
piece handle=/u02/rmanbak/c-4252637343-20140830-09 comment=NONE
Finished Control File and SPFILE Autobackup at 30-AUG-14

backup......plus archiverlog命令在备份过程中会依次执行下列步骤：

1）运行alter system archive log current 语句对当前redolog进行归档

2）执行backup archivelog all命令备份所有已归档的日志

3）执行backup命令对指定项进行备份

4）再次运行alter system archive log current 语句对当前redolog归档

5）对新生成的尚未备份的归档文件进行备份

完成归档日志文件备份后，需要删除已备份过的归档文件。

命令backup ...............delete all input，会在完成备份后自动删除归档目录中已备份的归档日志

RMAN> list backup of archivelog all;


List of Backup Sets
===================
BS Key  Size       Device Type Elapsed Time Completion Time
------- ---------- ----------- ------------ ---------------
50      32.17M     DISK        00:00:06     30-AUG-14      
        BP Key: 50   Status: AVAILABLE  Compressed: NO  Tag: TAG20140830T064921
        Piece Name: /u01/oracle/rman_test/rman_archive/bak_1nph7n7i_1_1

  List of Archived Logs in backup set 50
  Thrd Seq     Low SCN    Low Time  Next SCN   Next Time
  ---- ------- ---------- --------- ---------- ---------
  1    37      1484568    30-AUG-14 1484590    30-AUG-14
  1    38      1484590    30-AUG-14 1504942    30-AUG-14
  1    39      1504942    30-AUG-14 1505018    30-AUG-14
  1    40      1505018    30-AUG-14 1505065    30-AUG-14
  1    41      1505065    30-AUG-14 1505155    30-AUG-14

BS Key  Size       Device Type Elapsed Time Completion Time
------- ---------- ----------- ------------ ---------------
52      32.33M     DISK        00:00:03     30-AUG-14      
        BP Key: 52   Status: AVAILABLE  Compressed: NO  Tag: TAG20140830T065440
        Piece Name: /u01/oracle/rman_test/rman_archive/plus_1pph7nhg_1_1

  List of Archived Logs in backup set 52
  Thrd Seq     Low SCN    Low Time  Next SCN   Next Time
  ---- ------- ---------- --------- ---------- ---------
  1    37      1484568    30-AUG-14 1484590    30-AUG-14
  1    38      1484590    30-AUG-14 1504942    30-AUG-14
  1    39      1504942    30-AUG-14 1505018    30-AUG-14
  1    40      1505018    30-AUG-14 1505065    30-AUG-14
  1    41      1505065    30-AUG-14 1505155    30-AUG-14
  1    42      1505155    30-AUG-14 1505416    30-AUG-14

BS Key  Size       Device Type Elapsed Time Completion Time
------- ---------- ----------- ------------ ---------------
54      2.50K      DISK        00:00:00     30-AUG-14      
        BP Key: 54   Status: AVAILABLE  Compressed: NO  Tag: TAG20140830T065448
        Piece Name: /u01/oracle/rman_test/rman_archive/plus_1rph7nho_1_1

  List of Archived Logs in backup set 54
  Thrd Seq     Low SCN    Low Time  Next SCN   Next Time
  ---- ------- ---------- --------- ---------- ---------
  1    43      1505416    30-AUG-14 1505427    30-AUG-14

明显看到plus_开头的比bak_开头的scn多两个

6、初始化参数文件的备份

通常在备份控制文件时，rman也会自动备份服务器端的初始化参数文件，并置于控制文件相同的备份片段中，因此极少需要单独对spfile进行备份，如果确实想单独备份也简单，直接使用backup spfile命令即可

操作过程同上





cindy-berry
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本套題庫是OCP考試中的OCP 063(中文版)試題，由CUUG整理，如有報考OCP認證意向，可以聯繫cuug諮詢老師。 36 請選擇兩項。 您針對自己的一個數據庫發出了以下命令: RMAN> BACKUP INCREMENTAL LEVE

原創 2021-09-29 21:19:03

OCP 063中文考试题库(cuug内部资料)第33题

本套題庫是OCP考試中的OCP 063(中文版)試題，由CUUG整理，如有報考OCP認證意向，可以聯繫cuug諮詢老師。 33 請選擇最佳答案。 數據庫正在ARCHIVELOG模式下運行並且啓用了閃回。 在哪種情況下必須使用RMAN備份來恢

原創 2021-09-26 21:19:12

OCP 063中文考试题库(cuug内部资料)第29题

本套題庫是OCP考試中的OCP 063(中文版)試題，由CUUG整理，如有報考OCP認證意向，可以聯繫cuug諮詢老師。 29 請選擇最佳答案。 您的數據庫正在ARCHIVELOG模式下運行。您使用RMAN生成映像副本，並每六個小時增量更新

原創 2021-09-22 21:19:40

Linux & Oracle 安装目录说明

Linux 操作系統主要目錄 /bin：存放着一百多個Linux下常用的命令、工具 /dev：存放着Linux下所有的設備文件 /home：用戶主目錄，每建一個用戶，就會在這裏新建一個與用戶同名的目錄，給該用戶一個自己的空間 /lost+f

原創 2021-09-18 21:26:21

OCP 063中文考试题库(cuug内部资料)第24题

本套題庫是OCP考試中的OCP 063(中文版)試題，由CUUG整理，如有報考OCP認證意向，可以聯繫cuug諮詢老師。 24 請選擇四項。 您的一個數據庫支持數據倉庫工作量，並處於NOARCHIVELOG模式。 您在週日執行RMAN 0級

原創 2021-09-13 21:19:04

OCP 063中文考试题库(cuug内部资料)第22题

本套題庫是OCP考試中的OCP 063(中文版)試題，由CUUG整理，如有報考OCP認證意向，可以聯繫cuug諮詢老師。 22 請選擇兩項。 查看以下RMAN命令: RMAN> CONNECT TARGET "sbu@prod AS SYS

原創 2021-09-09 21:19:10

OCP 062【中文】考试题库(cuug内部资料)第36题

本套題庫是OCP考試中的OCP 062(中文版)試題，由CUUG整理，如有報考OCP認證意向，可以聯繫cuug諮詢老師。 36、請選擇最佳答案。 您的一個數據庫在ARCHIVELOG模式下運行。 查看以下命令: SELECT open_mo

原創 2021-08-11 21:21:25

OCP 062【中文】考试题库(cuug内部资料)第20题

本套題庫是OCP考試中的OCP 062(中文版)試題，由CUUG整理，如有報考OCP認證意向，可以聯繫cuug諮詢老師。 20、請選擇兩項。 您的數據庫都在ARCHIVELOG模式下運行。 新創建的數據庫沒有RMAN備份。 查看以下命令:

原創 2021-07-21 21:24:26

如何实现Oracle数据库的读写分离

在MySQL作爲應用系統的後臺數據庫時，我們常常見到這樣的架構，一拖二、一拖三等等。這是用MySQL的讀寫分離技術，實現數據的寫入和讀取分別在不同的庫上，提升了數據庫服務能力。 同樣，在Oracle作爲後臺數據庫的架構中，我

原創 2021-03-22 21:35:25

对Oracle数据库坏块的理解

1.物理壞塊和邏輯壞塊       在數據庫中有一個概念叫做數據塊的一致性，Oracle的數據塊的一致性包括了兩個層次：物理一致性和邏輯一致性，如果一個數據塊在這兩個層次上存在不一致性，那就對應到了我們今天要要說的物理壞塊和邏輯壞塊。   

原創 2021-03-22 21:35:25

Oracle OCP 19c 认证1Z0-083考试题库（第3题）

Oracle OCP 19c 認證1Z0-083考試題庫（第3題）-CUUG整理 3、While backing up to an SBT channel, you determine that the read phase of your

原創 2021-03-22 21:22:33

Oracle11g：数据库恢复总结

一、參數文件 1、操作系統文件複製 如果使用操作系統命令複製過參數文件，還原只要複製回去就行。 2、備份集恢復 rman恢復需要啓動實例，SQL*PLUS在沒有參數文件的情況下不能打開，但是rman可以在沒有參數文件的情況下，通過內置

osc_2mvp7jnu 2021-02-06 21:17:11