OPS 에서 한 NODE FAIL 시 다른 NODE 로 자동으로 TRANSFER 하기

제품 : SQL*PLUS
작성날짜 : 1997-07-29
OPS에서 여러 node를 사용 중 한 시스템이 fail이 생길 경우
=====================================================
다음은 사용자의 application 수정없이 failover 시스템으로 접속하는 방법이다.
제약조건 > SQL*NET V2.3.2.1.6 for windows 95
SQL*NET V2.3.2.1.8 for windows
상기의 버젼 이상이라야 하며 위의 경우 tnsnames.ora화일의 configuration은
다음과 같다 .
SQL*Net 2.3 failover가 난 경우 tnsnames.ora file
사용자가 <alias> 에 connect 하기를 요청한 경우 , sqlnet 은 description_list의
첫번째 description address 에 connect 을 시도한다.
만약 이것이 실패할 경우 description_list 의 다음 description 에 connect 을
시도한다.
필요하다면 description list 에 여러 description 을 가질수있다.
만일 모든 description 으로의 연결이 실패한다면 client 는 error 를 발생시킨다.
<alias>=
(description_list=
(description=
(address_list=
(address=
(protocol=tcp)
(host=<server 1>)
(port=1521)
(connect_data=
(sid=<sid1>)
(description=
(address_list=
(address= (protocol=tcp)
(host=<server 2>)
(port=1521)
(connect_data=
(sid=<sid2>)
)

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