1、在建库时,catproc一定要运行,否则用rman时会出现如下字符集的错误:
RMAN-00554: initialization of internal recovery manager package failed
RMAN-04005: error from target database: ORA-06553: PLS-213: package STANDARD noe
RMAN-04015: error setting target database character set to ZHS16CGB231280
如果建库时没有问题,那么可以Re-run catproc.sql. This will in turn call the dbmsbkrs.sql script which creates the dbms_backup_restore package.
2、中文字符集说明
ZHS16CGB231280 CGB2312-80 16-bit Simplified Chinese MB, ASCII
ZHS16GBK GBK 16-bit Simplified Chinese MB, ASCII, UDC
简单地说ZHS16GBK是ZHS16CGB231280的超集。
一九九○年中国、日本、韩国共同制定的统一东亚表意文字字符集,即常称的国标扩展码字符集(GBK)。
3、如何避免中文支持问题
我们的一贯建议是在建库时就做好规划,这样以后就不会有问题了。
1)create database
character set ZHS16GBK
national character set ZHS16GBK
2)环境变量:NLS_LANG=american_america.ZHS16GBK
最好export NL2004-10-20_FORMAT='YYYY-MM-DD HH24:MI:SS'指明日期格式;
3)如果建库时指定了props$中characterset肯定就是ZHSS16GBK了:
NLS_CHARACTERSET ZHS16GBK
NLS_NCHAR_CHARACTERSET ZHS16GBK
如果不是可以使用update改变,但这样做对于已有数据会有影响,甚至会导致整个数据库不能用,所以还是在建库之后就进行验证,一个好的DBA就是能够尽量避免问题的发生,而不是等到出了问题再去救火。
如此一来就不会再有字符集和中文支持的问题了。还有问题吗?和我联系:)

方法:1、利用“select*from user_indexes where table_name=表名”语句查询表中索引;2、利用“select*from all_indexes where table_name=表名”语句查询所有索引。

oracle asm指的是“自动存储管理”,是一种卷管理器,可自动管理磁盘组并提供有效的数据冗余功能;它是做为单独的Oracle实例实施和部署。asm的优势:1、配置简单、可最大化推动数据库合并的存储资源利用;2、支持BIGFILE文件等。

在oracle中,可以利用“TO_SINGLE_BYTE(String)”将全角转换为半角;“TO_SINGLE_BYTE”函数可以将参数中所有多字节字符都替换为等价的单字节字符,只有当数据库字符集同时包含多字节和单字节字符的时候有效。

在Oracle中,可利用lsnrctl命令查询端口号,该命令是Oracle的监听命令;在启动、关闭或重启oracle监听器之前可使用该命令检查oracle监听器的状态,语法为“lsnrctl status”,结果PORT后的内容就是端口号。

在oracle中,可以利用“drop sequence sequence名”来删除sequence;sequence是自动增加数字序列的意思,也就是序列号,序列号自动增加不能重置,因此需要利用drop sequence语句来删除序列。

在oracle中,可以利用“select ... From all_tab_columns where table_name=upper('表名') AND owner=upper('数据库登录用户名');”语句查询数据库表的数据类型。

方法:1、利用“LOWER(字段值)”将字段转为小写,或者利用“UPPER(字段值)”将字段转为大写;2、利用“REGEXP_LIKE(字符串,正则表达式,'i')”,当参数设置为“i”时,说明进行匹配不区分大小写。

方法:1、利用“alter system set sessions=修改后的数值 scope=spfile”语句修改session参数;2、修改参数之后利用“shutdown immediate – startup”语句重启服务器即可生效。


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