分类目录归档：Oracle

oracle 插入含&字符串

发表于 2011 年 8 月 19 日 由 惜分飞

1、创建表
SQL> create table t(id number,name varchar2(20));

表已创建。

2、常规方式插入
SQL> insert into t values(1,’a&b’);
输入 b 的值: a&b
原值 1: insert into t values(1,’a&b’)
新值 1: insert into t values(1,’aa&b’)

已创建 1 行。

3、chr(38)插入
SQL> insert into t values(2,’c’||chr(38)||’d’);

已创建 1 行。

4、set define
SQL> set define `
SQL> insert into t values(3,’e&f’);

已创建 1 行。

5、查看结果
SQL> select * from t;

ID NAME
———- ——————–
1 aa&b
2 c&d
3 e&f

6、说明
第一种方法不能得到正常的，我想要的结果，而且第一种方法在应用程序中也比较难实现
第二种比较适合应用程序实现
第三种比较适合sqlplus进行批量处理数据

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ORA-01578坏块解决(2)

发表于 2011 年 8 月 16 日 由 惜分飞

ORA-01578坏块解决(1)续集
如果在坏块之前，有rman备份，可以使用rman的备份来进行恢复，确保数据不会被丢失

1、使用rman进行恢复
[oracle@ECP-UC-DB1 ~]$ $ORACLE_HOME/bin/rman target /
Recovery Manager: Release 10.2.0.4.0 – Production on Sun Aug 14 22:21:13 2011
Copyright (c) 1982, 2007, Oracle. All rights reserved.

connected to target database: TEST (DBID=2056006906)

RMAN> blockrecover datafile 6 block 1477;

Starting blockrecover at 2011-08-14 22:21:16
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=145 devtype=DISK

channel ORA_DISK_1: restoring block(s)
channel ORA_DISK_1: specifying block(s) to restore from backup set
restoring blocks of datafile 00006
channel ORA_DISK_1: reading from backup piece /tmp/0fmk0ii5_1_1
channel ORA_DISK_1: restored block(s) from backup piece 1
piece handle=/tmp/0fmk0ii5_1_1 tag=TAG20110814T213357
channel ORA_DISK_1: block restore complete, elapsed time: 00:00:02

starting media recovery
media recovery complete, elapsed time: 00:00:03

Finished blockrecover at 2011-08-14 22:21:23

2、检查坏块是否被恢复
RMAN> backup check logical validate datafile 6;

Starting backup at 2011-08-14 22:22:11
using channel ORA_DISK_1
channel ORA_DISK_1: starting full datafile backupset
channel ORA_DISK_1: specifying datafile(s) in backupset
input datafile fno=00006 name=/opt/oracle/oradata/test/xifenfei01.dbf
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01
Finished backup at 2011-08-14 22:22:12

RMAN> exit

Recovery Manager complete.

[oracle@ECP-UC-DB1 ~]$ sqlplus / as sysdba
SQL*Plus: Release 10.2.0.4.0 – Production on Sun Aug 14 22:22:17 2011
Copyright (c) 1982, 2007, Oracle. All Rights Reserved.

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 – 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> select file#,block#,blocks from v$database_block_corruption;

no rows selected

SQL> exit
Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 – 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
[oracle@ECP-UC-DB1 ~]$ dbv file =/opt/oracle/oradata/test/xifenfei01.dbf

DBVERIFY: Release 10.2.0.4.0 – Production on Sun Aug 14 22:22:38 2011

Copyright (c) 1982, 2007, Oracle. All rights reserved.

DBVERIFY – Verification starting : FILE = /opt/oracle/oradata/test/xifenfei01.dbf

DBVERIFY – Verification complete

Total Pages Examined : 2560
Total Pages Processed (Data) : 1372
Total Pages Failing (Data) : 0
Total Pages Processed (Index): 0
Total Pages Failing (Index): 0
Total Pages Processed (Other): 48
Total Pages Processed (Seg) : 0
Total Pages Failing (Seg) : 0
Total Pages Empty : 1140
Total Pages Marked Corrupt : 0
Total Pages Influx : 0
Highest block SCN : 1256690 (0.1256690)

3、验证数据是否正确
[oracle@ECP-UC-DB1 ~]$ sqlplus / as sysdba
SQL*Plus: Release 10.2.0.4.0 – Production on Sun Aug 14 22:34:18 2011
Copyright (c) 1982, 2007, Oracle. All Rights Reserved.

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 – 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> select count(*) from t_rep;

COUNT(*)
———-
49857

和ORA-01578坏块解决(1)中的模拟环境比较，数据恢复正确，坏块问题解决

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ORA-01578坏块解决(1)

发表于 2011 年 8 月 15 日 由 惜分飞
一、创建测试表
SQL> create table t_rep as
2  select * from all_objects;
Table created.
SQL> select count(*) from  t_rep;
COUNT(*)
———-
49857
二、使用bbed修改数据块
三、错误现象
1、sqlplus窗口
SQL> select count(*) from  t_rep;
select count(*) from  t_rep
*
ERROR at line 1:
ORA-01578: ORACLE data block corrupted (file # 6, block # 1477)
ORA-01110: data file 6: ‘/opt/oracle/oradata/test/xifenfei01.dbf’
2、alert.log文件中
Sun Aug 14 22:01:14 2011
Hex dump of (file 6, block 1477) in trace file /opt/oracle/admin/test/udump/test_ora_10785.trc
Corrupt block relative dba: 0x018005c5 (file 6, block 1477)
Bad check value found during buffer read
Data in bad block:
type: 6 format: 2 rdba: 0x018005c5
last change scn: 0×0000.001328ef seq: 0×2 flg: 0×04
spare1: 0×0 spare2: 0×0 spare3: 0×0
consistency value in tail: 0x28ef0602
check value in block header: 0×493
computed block checksum: 0x44b9
Reread of rdba: 0x018005c5 (file 6, block 1477) found same corrupted data
Sun Aug 14 22:01:15 2011
Corrupt Block Found
TSN = 6, TSNAME = XFF
RFN = 6, BLK = 1477, RDBA = 25167301
OBJN = 52727, OBJD = 52728, OBJECT = T_REP, SUBOBJECT =
SEGMENT OWNER = SYS, SEGMENT TYPE = Table Segment
四、验证是否真的坏块
1、dbv验证
[oracle@ECP-UC-DB1 ~]$ dbv file =/opt/oracle/oradata/test/xifenfei01.dbf
DBVERIFY: Release 10.2.0.4.0 – Production on Sun Aug 14 22:08:37 2011
Copyright (c) 1982, 2007, Oracle.  All rights reserved.
DBVERIFY – Verification starting : FILE = /opt/oracle/oradata/test/xifenfei01.dbf
Page 1477 is marked corrupt
Corrupt block relative dba: 0x018005c5 (file 6, block 1477)
Bad check value found during dbv:
Data in bad block:
type: 6 format: 2 rdba: 0x018005c5
last change scn: 0×0000.001328ef seq: 0×2 flg: 0×04
spare1: 0×0 spare2: 0×0 spare3: 0×0
consistency value in tail: 0x28ef0602
check value in block header: 0×493
computed block checksum: 0x44b9
DBVERIFY – Verification complete
Total Pages Examined         : 2560
Total Pages Processed (Data) : 1371
Total Pages Failing   (Data) : 0
Total Pages Processed (Index): 0
Total Pages Failing   (Index): 0
Total Pages Processed (Other): 48
Total Pages Processed (Seg)  : 0
Total Pages Failing   (Seg)  : 0
Total Pages Empty            : 1140
Total Pages Marked Corrupt   : 1
Total Pages Influx           : 0
Highest block SCN            : 1256043 (0.1256043)
2、rman验证
RMAN> backup check logical validate datafile 6;
Starting backup at 2011-08-14 22:09:51
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=157 devtype=DISK
channel ORA_DISK_1: starting full datafile backupset
channel ORA_DISK_1: specifying datafile(s) in backupset
input datafile fno=00006 name=/opt/oracle/oradata/test/xifenfei01.dbf
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01
Finished backup at 2011-08-14 22:09:53
RMAN> exit
Recovery Manager complete.
[oracle@ECP-UC-DB1 ~]$ sqlplus / as sysdba
SQL*Plus: Release 10.2.0.4.0 – Production on Sun Aug 14 22:10:00 2011
Copyright (c) 1982, 2007, Oracle.  All Rights Reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 – 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL>  select file#,block#,blocks from v$database_block_corruption;SQL> exec dbms_repair.skip_corrupt_blocks(‘SYS’,’T_REP’);
FILE#     BLOCK#     BLOCKS
———- ———- ———-
6       1477          1
五、跳过坏块读取其他数据
SQL> exec dbms_repair.skip_corrupt_blocks(‘SYS’,’T_REP’);
PL/SQL procedure successfully completed.
SQL> select skip_corrupt from dba_tables where table_name=’T_REP’;
SKIP_COR
——–
ENABLED
SQL> select count(*) from t_rep;
COUNT(*)
———-
49794
说明：数据发生丢失6号文件的1477块中的数据丢失
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