删除Oracle文件
oracle@zdb002 orcl ps -ef\|grep smon oracle 12774 1 0 11:44 ? 00:00:00 ora_smon_orcl oracle 16681 16604 0 12:49 pts/1 00:00:00 grep --color=auto smon \[oracle@zdb002 orcl\] ls
control01.ctl control02.ctl redo01.log redo02.log redo03.log sysaux01.dbf system01.dbf temp01.dbf undotbs01.dbf users01.dbf
oracle@zdb002 orcl rm -rf \* \[oracle@zdb002 orcl\] ls -l
total 0
oracle@zdb002 orcl$ ps -ef|grep smon
oracle 12774 1 0 11:44 ? 00:00:00 ora_smon_orcl
oracle 16736 16604 0 12:49 pts/1 00:00:00 grep --color=auto smon
插入数据测试复制之前是否会丢数据
SQL> select * from test;
X
1
SQL> insert into test values(2);
1 row created.
SQL> commit;
Commit complete.
SQL> select * from test;
X
1
2
用文件句柄复制恢复
---通过dbw进程查看
oracle@zdb002 \~$ ps -ef|grep dbw|grep -v grep
oracle 12768 1 0 11:44 ? 00:00:00 ora_dbw0_orcl
oracle@zdb002 \~$ ls -rtl /proc/12768/fd
total 0
lrwx------. 1 oracle oinstall 64 Nov 13 12:51 9 -> /u01/app/oracle/product/11.2.0.4/dbhome_1/dbs/hc_orcl.dat
lr-x------. 1 oracle oinstall 64 Nov 13 12:51 8 -> /dev/zero
lr-x------. 1 oracle oinstall 64 Nov 13 12:51 7 -> /proc/12768/fd/
lr-x------. 1 oracle oinstall 64 Nov 13 12:51 6 -> /u01/app/oracle/product/11.2.0.4/dbhome_1/rdbms/mesg/oraus.msb
lr-x------. 1 oracle oinstall 64 Nov 13 12:51 5 -> /dev/null
lr-x------. 1 oracle oinstall 64 Nov 13 12:51 4 -> /dev/null
lr-x------. 1 oracle oinstall 64 Nov 13 12:51 3 -> /dev/null
lrwx------. 1 oracle oinstall 64 Nov 13 12:51 262 -> /u01/app/oracle/oradata/orcl/temp01.dbf (deleted)
lrwx------. 1 oracle oinstall 64 Nov 13 12:51 261 -> /u01/app/oracle/oradata/orcl/users01.dbf (deleted)
lrwx------. 1 oracle oinstall 64 Nov 13 12:51 260 -> /u01/app/oracle/oradata/orcl/undotbs01.dbf (deleted)
lrwx------. 1 oracle oinstall 64 Nov 13 12:51 259 -> /u01/app/oracle/oradata/orcl/sysaux01.dbf (deleted)
lrwx------. 1 oracle oinstall 64 Nov 13 12:51 258 -> /u01/app/oracle/oradata/orcl/system01.dbf (deleted)
lrwx------. 1 oracle oinstall 64 Nov 13 12:51 257 -> /u01/app/oracle/oradata/orcl/control02.ctl (deleted)
lrwx------. 1 oracle oinstall 64 Nov 13 12:51 256 -> /u01/app/oracle/oradata/orcl/control01.ctl (deleted)
l-wx------. 1 oracle oinstall 64 Nov 13 12:51 2 -> /dev/null
lr-x------. 1 oracle oinstall 64 Nov 13 12:51 11 -> /u01/app/oracle/product/11.2.0.4/dbhome_1/rdbms/mesg/oraus.msb
lrwx------. 1 oracle oinstall 64 Nov 13 12:51 10 -> /u01/app/oracle/product/11.2.0.4/dbhome_1/dbs/lkORCL
l-wx------. 1 oracle oinstall 64 Nov 13 12:51 1 -> /dev/null
lr-x------. 1 oracle oinstall 64 Nov 13 12:51 0 -> /dev/null
--通过lgwr进程查看，比dbw多出redo
oracle@zdb002 \~$ ps -ef|grep lgw|grep -v grep
oracle 12770 1 0 11:44 ? 00:00:00 ora_lgwr_orcl
oracle@zdb002 \~$ ls -rtl /proc/12770/fd
total 0
lrwx------. 1 oracle oinstall 64 Nov 13 12:52 9 -> /u01/app/oracle/product/11.2.0.4/dbhome_1/dbs/hc_orcl.dat
lr-x------. 1 oracle oinstall 64 Nov 13 12:52 8 -> /dev/zero
lr-x------. 1 oracle oinstall 64 Nov 13 12:52 7 -> /proc/12770/fd/
lr-x------. 1 oracle oinstall 64 Nov 13 12:52 6 -> /u01/app/oracle/product/11.2.0.4/dbhome_1/rdbms/mesg/oraus.msb
lr-x------. 1 oracle oinstall 64 Nov 13 12:52 5 -> /dev/null
lr-x------. 1 oracle oinstall 64 Nov 13 12:52 4 -> /dev/null
lr-x------. 1 oracle oinstall 64 Nov 13 12:52 3 -> /dev/null
lrwx------. 1 oracle oinstall 64 Nov 13 12:52 265 -> /u01/app/oracle/oradata/orcl/temp01.dbf (deleted)
lrwx------. 1 oracle oinstall 64 Nov 13 12:52 264 -> /u01/app/oracle/oradata/orcl/users01.dbf (deleted)
lrwx------. 1 oracle oinstall 64 Nov 13 12:52 263 -> /u01/app/oracle/oradata/orcl/undotbs01.dbf (deleted)
lrwx------. 1 oracle oinstall 64 Nov 13 12:52 262 -> /u01/app/oracle/oradata/orcl/sysaux01.dbf (deleted)
lrwx------. 1 oracle oinstall 64 Nov 13 12:52 261 -> /u01/app/oracle/oradata/orcl/system01.dbf (deleted)
lrwx------. 1 oracle oinstall 64 Nov 13 12:52 260 -> /u01/app/oracle/oradata/orcl/redo03.log (deleted)
lrwx------. 1 oracle oinstall 64 Nov 13 12:52 259 -> /u01/app/oracle/oradata/orcl/redo02.log (deleted)
lrwx------. 1 oracle oinstall 64 Nov 13 12:52 258 -> /u01/app/oracle/oradata/orcl/redo01.log (deleted)
lrwx------. 1 oracle oinstall 64 Nov 13 12:52 257 -> /u01/app/oracle/oradata/orcl/control02.ctl (deleted)
lrwx------. 1 oracle oinstall 64 Nov 13 12:52 256 -> /u01/app/oracle/oradata/orcl/control01.ctl (deleted)
l-wx------. 1 oracle oinstall 64 Nov 13 12:52 2 -> /dev/null
lr-x------. 1 oracle oinstall 64 Nov 13 12:52 11 -> /u01/app/oracle/product/11.2.0.4/dbhome_1/rdbms/mesg/oraus.msb
lrwx------. 1 oracle oinstall 64 Nov 13 12:52 10 -> /u01/app/oracle/product/11.2.0.4/dbhome_1/dbs/lkORCL
l-wx------. 1 oracle oinstall 64 Nov 13 12:52 1 -> /dev/null
lr-x------. 1 oracle oinstall 64 Nov 13 12:52 0 -> /dev/null
复制删除文件回原位置
oracle@zdb002 \~$ cp /proc/12770/fd/265 /u01/app/oracle/oradata/orcl/temp01.dbf
oracle@zdb002 \~$ cp /proc/12770/fd/264 /u01/app/oracle/oradata/orcl/users01.dbf
oracle@zdb002 \~$ cp /proc/12770/fd/263 /u01/app/oracle/oradata/orcl/undotbs01.dbf
oracle@zdb002 \~$ cp /proc/12770/fd/262 /u01/app/oracle/oradata/orcl/sysaux01.dbf
oracle@zdb002 \~$ cp /proc/12770/fd/261 /u01/app/oracle/oradata/orcl/system01.dbf
oracle@zdb002 \~$ cp /proc/12770/fd/260 /u01/app/oracle/oradata/orcl/redo03.log
oracle@zdb002 \~$ cp /proc/12770/fd/259 /u01/app/oracle/oradata/orcl/redo02.log
oracle@zdb002 \~$ cp /proc/12770/fd/258 /u01/app/oracle/oradata/orcl/redo01.log
oracle@zdb002 \~$ cp /proc/12770/fd/257 /u01/app/oracle/oradata/orcl/control02.ctl
oracle@zdb002 \~$ cp /proc/12770/fd/256 /u01/app/oracle/oradata/orcl/control01.ctl
oracle@zdb002 orcl$ ls -l
total 1470028
-rw-r-----. 1 oracle oinstall 9748480 Nov 13 12:54 control01.ctl
-rw-r-----. 1 oracle oinstall 9748480 Nov 13 12:54 control02.ctl
-rw-r-----. 1 oracle oinstall 52429312 Nov 13 12:54 redo01.log
-rw-r-----. 1 oracle oinstall 52429312 Nov 13 12:54 redo02.log
-rw-r-----. 1 oracle oinstall 52429312 Nov 13 12:54 redo03.log
-rw-r-----. 1 oracle oinstall 513810432 Nov 13 12:54 sysaux01.dbf
-rw-r-----. 1 oracle oinstall 775954432 Nov 13 12:54 system01.dbf
-rw-r-----. 1 oracle oinstall 20979712 Nov 13 12:54 temp01.dbf
-rw-r-----. 1 oracle oinstall 31465472 Nov 13 12:54 undotbs01.dbf
-rw-r-----. 1 oracle oinstall 5251072 Nov 13 12:54 users01.dbf
还是显示delete，未使用复制文件
oracle@zdb002 \~$ ls -rtl /proc/12770/fd
total 0
lrwx------. 1 oracle oinstall 64 Nov 13 12:52 9 -> /u01/app/oracle/product/11.2.0.4/dbhome_1/dbs/hc_orcl.dat
lr-x------. 1 oracle oinstall 64 Nov 13 12:52 8 -> /dev/zero
lr-x------. 1 oracle oinstall 64 Nov 13 12:52 7 -> /proc/12770/fd/
lr-x------. 1 oracle oinstall 64 Nov 13 12:52 6 -> /u01/app/oracle/product/11.2.0.4/dbhome_1/rdbms/mesg/oraus.msb
lr-x------. 1 oracle oinstall 64 Nov 13 12:52 5 -> /dev/null
lr-x------. 1 oracle oinstall 64 Nov 13 12:52 4 -> /dev/null
lr-x------. 1 oracle oinstall 64 Nov 13 12:52 3 -> /dev/null
lrwx------. 1 oracle oinstall 64 Nov 13 12:52 265 -> /u01/app/oracle/oradata/orcl/temp01.dbf (deleted)
lrwx------. 1 oracle oinstall 64 Nov 13 12:52 264 -> /u01/app/oracle/oradata/orcl/users01.dbf (deleted)
lrwx------. 1 oracle oinstall 64 Nov 13 12:52 263 -> /u01/app/oracle/oradata/orcl/undotbs01.dbf (deleted)
lrwx------. 1 oracle oinstall 64 Nov 13 12:52 262 -> /u01/app/oracle/oradata/orcl/sysaux01.dbf (deleted)
lrwx------. 1 oracle oinstall 64 Nov 13 12:52 261 -> /u01/app/oracle/oradata/orcl/system01.dbf (deleted)
lrwx------. 1 oracle oinstall 64 Nov 13 12:52 260 -> /u01/app/oracle/oradata/orcl/redo03.log (deleted)
lrwx------. 1 oracle oinstall 64 Nov 13 12:52 259 -> /u01/app/oracle/oradata/orcl/redo02.log (deleted)
lrwx------. 1 oracle oinstall 64 Nov 13 12:52 258 -> /u01/app/oracle/oradata/orcl/redo01.log (deleted)
lrwx------. 1 oracle oinstall 64 Nov 13 12:52 257 -> /u01/app/oracle/oradata/orcl/control02.ctl (deleted)
lrwx------. 1 oracle oinstall 64 Nov 13 12:52 256 -> /u01/app/oracle/oradata/orcl/control01.ctl (deleted)
l-wx------. 1 oracle oinstall 64 Nov 13 12:52 2 -> /dev/null
lr-x------. 1 oracle oinstall 64 Nov 13 12:52 11 -> /u01/app/oracle/product/11.2.0.4/dbhome_1/rdbms/mesg/oraus.msb
lrwx------. 1 oracle oinstall 64 Nov 13 12:52 10 -> /u01/app/oracle/product/11.2.0.4/dbhome_1/dbs/lkORCL
l-wx------. 1 oracle oinstall 64 Nov 13 12:52 1 -> /dev/null
lr-x------. 1 oracle oinstall 64 Nov 13 12:52 0 -> /dev/null
插入数据测试复制后是否会丢数据
SQL> insert into test values(3);
1 row created.
SQL> commit;
Commit complete.
SQL> select * from test;
X
1
2
3
SQL> insert into test values(4);
1 row created.
SQL> commit;
Commit complete.
SQL> select * from test;
X
1
2
3
4
重启数据库
SQL> shutdown immediate
ORA-03113: end-of-file on communication channel
SQL>
SQL> startup
ORACLE instance started.
Total System Global Area 1586708480 bytes
Fixed Size 2253624 bytes
Variable Size 973081800 bytes
Database Buffers 603979776 bytes
Redo Buffers 7393280 bytes
Database mounted.
Database opened.
后插入数据未出现
SQL> select * from test;
X
1
2
复制数据文件前需要停止业务，复制后产生的新数据不录入数据库。
由于测试全部删除数据文件，不涉及文件scn变化。