Oracle database is a database software developed by the American company Oracle. This software is based on the relational database management system (RDBMS) and is mainly used for enterprise resource planning, supply chain management and data warehouse applications. It is widely used in finance, medical and other industries.
Country affiliation of Oracle database
Oracle database is a relational database management system developed by Oracle Corporation. Database software for systems (RDBMS). Oracle Corporation is a multinational company headquartered in the United States, so the Oracle database is also an American product.
History of Oracle Corporation
Oracle Corporation was founded in 1977 by Larry Ellison and Bob Miner. Originally named Software Development Laboratories (SDL), the company developed database software for Central Information Processing (CIP) systems. In 1979, SDL changed its name to Relational Software, Inc. (RSI), and in 1982 it officially changed its name to Oracle Systems Corporation.
Development of Oracle Database
The first version of Oracle Database was released in 1979. It is a database management system based on the relational model that allows users to store, organize and retrieve data in tabular form. Over time, Oracle Database has evolved, adding new functionality and features, making it a widely used database solution across businesses and organizations.
Now's Oracle Database
Today, Oracle Database remains one of the world's leading database management systems. It powers a variety of applications and industries, including:
- Enterprise Resource Planning (ERP)
- Customer Relationship Management (CRM)
- Supply Chain Management( SCM)
- Data Warehousing
- Business Intelligence
Oracle Database is known for its scalability, reliability, and performance. It is widely used in various industries such as finance, healthcare, manufacturing and retail.
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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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