一、原理
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冷备份
数据库在关闭状态下完成所有物理系统文件拷贝的过程,也称脱机备份
适合于非归档模式下,数据库处于一致性状态
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步骤
首先在运行的库中得到数据库运行的所有的物理文件位置,然后在计划内关闭数据库(shutdown)
再执行拷贝物理文家到备份路径或备份设备
备份完成后立即启动数据库让其提供正常的服务
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总结 - 优点
冷备模式下概念易于理解,即将需要备份的文件复制到安全的位置
操作比较简单,不需要太多的干预
容易恢复到某个时间点上(只需将文件再拷贝回去)
能与归档方法相结合,作数据库“最新状态”的恢复。
4.总结 - 缺点
备份时,数据库必须处于一致性关闭状态
只能提供到某一时间点的恢复
备份时速度比较慢,尤其是数据量大性能影响比较大
不能实现基于表和用户级别的数据恢复
二、案例
首先应该在相关视图里查出数据库的数据文件,日志文件,控制文件,临时文件所在的位置。注意:不要直接把oradata下的cp就行了,因为生产库里各个文件通常分布在不同的磁盘,不同的地方,所以在去视图里获得真实路径 。
1).查看数据库是否为CDB
SYS@newtest>select name, decode(cdb, 'YES', 'Multitenant Option enabled', 'Regular 12c Database: ') "Multitenant Option" , open_mode, con_id from v$database;
NAME Multitenant Option OPEN_MODE CON_ID
NEWTEST Multitenant Option enabled READ WRITE 0
YES表示该数据库是CDB,如果是NO表示是NO-CDB(普通数据库)
2).查看实例和数据库的相关信息
SYS@newtest>select instance_name,version,status,archiver,database_status from v$instance;
INSTANCE_NAME VERSION STATUS ARCHIVE DATABASE_STATUS
newtest 12.2.0.1.0 OPEN STARTED ACTIVE
SYS@newtest>select dbid,name,log_mode from v$database;
DBID NAME LOG_MODE
1779551310 NEWTEST ARCHIVELOG
SYS@newtest>set linesize 180
SYS@newtest>col guid format A40
SYS@newtest>col name format A20
SYS@newtest>select con_id, dbid, guid, name , open_mode from v$pdbs;
CON_ID DBID GUID NAME OPEN_MODE
2 603865257 32CAC9A05E614355926257BE671D9AFC PDB$SEED READ ONLY
3 3394996704 24549D14BBEB417BAB312BF19BC5259E PDBTEST READ WRITE
4 50957894 D4B2FCAAC2B944CC8AF5864EC7CB853C CLONEPDB_PLUG READ WRITE
3). 查看数据文件及状态信息
SYS@newtest>col file_name format A60
SYS@newtest>select file_name,tablespace_name,status,online_status from dba_data_files;
FILE_NAME TABLESPACENAME STATUS ONLINE
C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\SYSTEM01.DBF SYSTEM AVAILABLE SYSTEM
C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\SYSAUX01.DBF SYSAUX AVAILABLE ONLINE
C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\UNDOTBS01.DBF UNDOTBS1 AVAILABLE ONLINE
C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\USERS01.DBF USERS AVAILABLE ONLINE
SYS@newtest>col con_id format 99
SYS@newtest>col name format A80
SYS@newtest>select con_id,FILE#,NAME,status,enabled from v$datafile order by 1;
CON_ID FILE# NAME STATUS ENABLED
1 1 C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\SYSTEM01.DBF SYSTEM READ WRITE
1 3 C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\SYSAUX01.DBF ONLINE READ WRITE
1 5 C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\UNDOTBS01.DBF ONLINE READ WRITE
1 7 C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\USERS01.DBF ONLINE READ WRITE
2 2 C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\PDBSEED\SYSTEM01.DBF SYSTEM READ WRITE
2 4 C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\PDBSEED\SYSAUX01.DBF ONLINE READ WRITE
2 6 C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\PDBSEED\UNDOTBS01.DBF ONLINE READ WRITE
3 8 C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\PDBTEST\SYSTEM01.DBF SYSTEM READ WRITE
3 11 C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\PDBTEST\USERS01.DBF ONLINE READ WRITE
3 10 C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\PDBTEST\UNDOTBS01.DBF ONLINE READ WRITE
3 9 C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\PDBTEST\SYSAUX01.DBF ONLINE READ WRITE
4 42 C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\CLONEPDB_PLUG\UNDOTBS01.DBF ONLINE READ WRITE
4 41 C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\CLONEPDB_PLUG\SYSAUX01.DBF ONLINE READ WRITE
4 40 C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\CLONEPDB_PLUG\SYSTEM01.DBF SYSTEM READ WRITE
4 43 C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\CLONEPDB_PLUG\USERS01.DBF ONLINE READ WRITE
15 rows selected.
4).查看临时文件
SYS@newtest>col name format A100
SYS@newtest>select name from v$tempfile;
NAME
C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\TEMP01.DBF
C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\PDBSEED\TEMP012017-12-13_17-23-31-944-PM.DBF
C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\PDBTEST\TEMP012017-12-13_17-23-31-944-PM.DBF
C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\CLONEPDB_PLUG\TEMP012017-12-13_17-23-31-944-PM.DBF
5).查看日志文件
SYS@newtest>col member format A60
SYS@newtest>select member from v$logfile;
MEMBER
C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\REDO03.LOG
C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\REDO02.LOG
C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\REDO01.LOG
6).查看控制文件
SYS@newtest>select name from v$controlfile;
C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\CONTROL01.CTL
C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\CONTROL02.CTL
7).创建备份目录
SYS@newtest>ho mkdir c:\oracleback
SYS@newtest>select 'ho mkdir '|| ' &dir\' ||NAME from v$pdbs;
Enter value for dir: C:\oracleback
old 1: select 'ho mkdir '|| ' &dir\' ||NAME from v$pdbs
new 1: select 'ho mkdir '|| ' C:\oracleback\' ||NAME from v$pdbs
'HOMKDIR'||'C:\ORACLEBACK\'||NAME
ho mkdir C:\oracleback\PDB$SEED
ho mkdir C:\oracleback\PDBTEST
ho mkdir C:\oracleback\CLONEPDB_PLUG
8).使用连接符生成复制文件命令
SYS@newtest>select 'ho copy ' || name || ' &dir' from v$controlfile
2 union all
3 select 'ho copy ' || member || ' &dir' from v$logfile
4 union all
5 select 'ho copy ' || file_name|| ' &dir' from dba_data_files
6 union all
7 select 'ho copy ' || vd.name || ' &dir\'|| vp.name as command from v$datafile vd join v$pdbs vp using(con_id)
8 union all
9 select 'ho copy ' || vt.name || ' &dir\'|| vp.name as command from v$tempfile vt join v$pdbs vp using(con_id)
10 /
old 1: select 'ho copy ' || name || ' &dir' from v$controlfile
new 1: select 'ho copy ' || name || ' C:\oracleback' from v$controlfile
old 3: select 'ho copy ' || member || ' &dir' from v$logfile
new 3: select 'ho copy ' || member || ' C:\oracleback' from v$logfile
old 5: select 'ho copy ' || file_name|| ' &dir' from dba_data_files
new 5: select 'ho copy ' || file_name|| ' C:\oracleback' from dba_data_files
old 7: select 'ho copy ' || vd.name || ' &dir\'|| vp.name as command from v$datafile vd join v$pdbs vp using(con_id)
new 7: select 'ho copy ' || vd.name || ' C:\oracleback\'|| vp.name as command from v$datafile vd join v$pdbs vp using(con_id)
old 9: select 'ho copy ' || vt.name || ' &dir\'|| vp.name as command from v$tempfile vt join v$pdbs vp using(con_id)
new 9: select 'ho copy ' || vt.name || ' C:\oracleback\'|| vp.name as command from v$tempfile vt join v$pdbs vp using(con_id)
'HOCOPY'||NAME||'C:\ORACLEBACK'
ho copy C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\CONTROL01.CTL C:\oracleback
ho copy C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\CONTROL02.CTL C:\oracleback
ho copy C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\REDO03.LOG C:\oracleback
ho copy C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\REDO02.LOG C:\oracleback
ho copy C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\REDO01.LOG C:\oracleback
ho copy C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\SYSTEM01.DBF C:\oracleback
ho copy C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\SYSAUX01.DBF C:\oracleback
ho copy C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\UNDOTBS01.DBF C:\oracleback
ho copy C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\USERS01.DBF C:\oracleback
ho copy C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\PDBSEED\SYSTEM01.DBF C:\oracleback\PDB$SEED
ho copy C:\APP\ADMINISTRATOR\VIRTUAL\ORADATA\NEWTEST\PDBSEED\SYSAUX01.DBF C:\oracleback\PDB$SEED