oracle数据库各种名字的区别(zt+理解)
数据库名(DB_NAME)、数据库实例名(INSTANCE_NAME)、操作系统环境变量ORACLE_SID、数据库服务名(SERVICE_NAME)、数据库域名(DB_DOMAIN)以及全局数据库名(GLOBAL_DB_NAME)http://www.oracle.com.cn/viewthread.php?tid=22329&highlight=%2Bwind%5C_skyINSTANCE_NAME一般和DB_NAME相同INSTANCE_NAME=ORACLE_SIDSERVICE_NAMES=全局数据库名=db_name+db_domain[@more@]数据库名(DB_NAME)、数据库实例名(INSTANCE_NAME)、操作系统环境变量(ORACLE_SID)、数据库服务名(SERVICE_NAME)、数据库域名(DB_DOMAIN)以及全局数据库
review "with check option"
The “with check option”, it is used to prevent changes to a view that would produce rows that are not included in a sub-query.[@more@]A “with check option” is designed for updatable views whereas a “check constraint” (coinstraint_type “V”) specifies valid values for an individual column: region_name varchar(5), CONSTRAINT check_region CHECK (region_name in ’north’,’south’,’east’,’west’) The “with check option”, it is used to prevent changes to a view that would prod