Orace数据库锁表的处理与总结<摘抄与总结三>

当Oracle数据库发生TX锁等待时，如果不及时处理常常会引起Oracle数据库挂起，或导致死锁的发生，产生ORA-60的错误。

TX锁等待的分析

Oracle数据库中一般使用行级锁。

当Oracle检测到死锁产生时，中断并回滚死锁相关语句的执行，报ORA-00060的错误并记录在数据库的日志文件alertSID.log中。同时在user_dump_dest下产生了一个跟踪文件，详细描述死锁的相关信息。

我们怎么查看日志文件和跟踪文件呢？下面介绍一下我们常用的命令

1、查看操作系统版本

SQL> select * from v$version;

BANNER

----------------------------------------------------------------

Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Prod

PL/SQL Release 10.2.0.1.0 - Production

CORE 10.2.0.1.0 Production

TNS for Linux: Version 10.2.0.1.0 - Production

NLSRTL Version 10.2.0.1.0 - Production

SQL>



2、查看预警日志文件（alert_sid.log）的位置

SQL> show parameter dump

NAME TYPE VALUE

------------------------------------ ----------- ------------------------------

background_core_dump string partial

background_dump_dest string /u01/oracle/admin/bdump

core_dump_dest string /u01/oracle/admin/cdump

max_dump_file_size string 10240

shadow_core_dump string partial

user_dump_dest string /u01/oracle/admin/udump



3、创建目录alert

注意：directory不是实体，只是一个指向，指向os中一个路径

SQL> create or replace directory alert as '/u01/oracle/admin/bdump';

Directory created.

SQL>



4、创建外部表alert

SQL> create table alert

1 (log varchar2(1000))

2 organization external

3 (type oracle_loader

4 default directory alert

5 access parameters

6 (records delimited by newline)

7 location ('alert_PROD.log'))

8 reject limit unlimited;

Table created.



5、查看alert中的内容

SQL> select * from alert where rownum<20;

LOG

--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


Wed Feb 27 11:05:11 2013

Starting ORACLE instance (normal)

Cannot determine all dependent dynamic libraries for /proc/self/exe

Unable to find dynamic library libocr10.so in search paths

RPATH = /ade/aime1_build2101/oracle/has/lib/:/ade/aime1_build2101/oracle/lib/:/ade/aime1_build2101/oracle/has/lib/:


LD_LIBRARY_PATH is not set!

The default library directories are /lib and /usr/lib

Unable to find dynamic library libocrb10.so in search paths

Unable to find dynamic library libocrutl10.so in search paths

Unable to find dynamic library libocrutl10.so in search paths

LICENSE_MAX_SESSION = 0

LICENSE_SESSIONS_WARNING = 0

Picked latch-free SCN scheme 2

Using LOG_ARCHIVE_DEST_1 parameter default value as /u01/oracle/product/10.2.0/db_1/dbs/arch


Autotune of undo retention is turned on.

IMODE=BR

ILAT =10

LICENSE_MAX_USERS = 0

SYS auditing is disabled

19 rows selected.

SQL>



6、看看数据库有哪些 可爱的ORA- 错误吧

SQL> select * from alert where log like '%ORA-%';

LOG

--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


ORA-959 signalled during: alter database default tablespace users...

ORA-959 signalled during: drop tablespace uses...

ORA-12919 signalled during: drop tablespace users...

ORA-1549 signalled during: drop tablespace users...

ORA-1505 signalled during: alter database add logfile group 1

ORA-1184 signalled during: alter database add logfile group 1

ORA-1013 signalled during: alter tablespace tts read only...

ORA-1013 signalled during: alter tablespace tts read only...

ORA-1013 signalled during: alter tablespace users read only...

ORA-1539 signalled during: alter tablespace users read only...