감사합니다.
해당 내용을 얼마전에 보았는데 별 도움이 되지 않더라구요...
혹시 서면용 답변말고요 , 쉽게 이해랄수 있게요 ㅋㅋㅋㅋ
우선 sid는 기본 데이터베이스별로 존재하는 이름이라고 생각하시면 되구요,
하나의 인스턴스에 하나의 디비가 존재할경우는 글로벌 네임도 sid와 동일합니다.
또, 글로벌 sid는 디비링크등을 타고 네트워크단에서 판단할 때 사용하는 이름입니다.
아래 자료가 쉽게 이해되시겠네요.
SID = identifies the database instance (database name + instance number). So if your database name is somedb and your instance number is 3, then your SID is somedb3.
DB Name = Name of the database (database can be shared b/t multiple instances)
DB Domain = Usually the same as your company domain (somecompany.com)
Global Database Name = Database name + database domain (somedb.somecompany.com)
Service Name = A "connector" to one or more instances. It is often useful to create additional service names in a RAC environment since the service can be modified to use particular SIDs as primary or secondary connections, or to not use certain SIDs at all.
Service Alias = An alias to the service name (just like a CNAME, etc). Say you make your service name something meaningful to the dba, but perhaps it's a bit esoteric. Create a service alias and name it something that will be meaningful to the user.
Instance name = same as SID