Oracle宣布向Linux kernel捐赠数据完整性代码。代码是Oracle和Emulex合作开发的,已被2.6.27 kernel所接受。代码向静止和传输中的
Oracle宣布向Linux kernel捐赠数据完整性代码。代码是Oracle和Emulex合作开发的,已被2.6.27 kernel所接受。
代码向静止和传输中的数据加入元数据,监视这些数据有没有被损坏。通过检查元数据——起验证信息作用——它将能保证I/O数据操作的有效性,,从而减少应用程序和数据库错误。
Oracle has announced that it has contributed data-integrity code to the Linux kernel.
The open-source code, which has been accepted into the Linux 2.6.27 kernel, is designed to reduce data corruption by decreasing the potential for incorrect data to be written to disk, and decreasing application and database errors, Oracle said in a statement on Tuesday. According to the enterprise-software maker, the code helps maintain integrity as data moves from application to database, and from Linux operating system to disk storage.
The code adds metadata to data at rest or in transit, to monitor whether that data has been corrupted. It helps make sure that I/O operations are valid by looking at that metadata — which acts as verification information — exchanged during data transmissions.
Oracle said it worked in conjunction with enterprise-network company Emulex to produce the code. Scott McIntyre, Emulex vice president of product marketing, said that the code contribution was a "significant milestone" for data-integrity development.
"Data integrity is vital to any business that relies on critical records and information to function successfully," McIntyre said in a statement. "Our work with Oracle is designed to help datacenter administrators quickly identify and remediate corrupted data, thereby protecting their business' assets, while also helping prevent lengthy server downtime and associated costs."
The code contribution includes generic support for data integrity at the block and file-system layers, Oracle added. Oracle and Emulex are also running an early-adopter program to allow customers to test the data-integrity features of the code. In 2007, Oracle, Emulex, Seagate and LSI formed the Data Integrity Initiative, designed to improve the integrity of data in transit and at rest. The initiative seeks to build on the data integrity field (DIF), now known as the T10 Protection Information Model, within the SCSI standard.

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。

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。

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“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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