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我在使用python连接oracle12.2.2的时候,报以下错误:
cx_Oracle.DatabaseError: ORA-12514: TNS:listener does not currently know of service requested in connect descriptor
译为:
cx_Oracle.DatabaseError: ORA-12514: TNS: 监听程序当前无法识别连接描述符中请求的服务
我的oracle是在远程服务器上使用docker-compose安装的,在服务器和客户端都可以连接成功,但是在python程序连接cx_oracle时报错。
查询网上资料好多有如下两种解决方案:
1.通过重启服务的方式启动数据库,再次连接服务器;
2.考虑监听listener.ora
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = E:\Oracle10g)
(PROGRAM = extproc)
)
#此处是添加部分,ORCL为监听的实例名
(SID_DESC =
(GLOBAL_DBNAME = ORCL)
(ORACLE_HOME = E:\Oracle10g)
(SID_NAME = ORCL)
)
##
)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
(ADDRESS = (PROTOCOL = TCP)(HOST = onest)(PORT = 1521))
)
)
3.第三种方案:
以上两种对我都不管用,最后我发现连接python连接cx_oracle时,要用SERVICE_NAME
,而不是sid
,至于原因,我再查查~~~
首先,在用管理员账号登陆oracle,查询SERVICE_NAME:
select value from v$parameter where name like '%service_name%';
其次,将查询到的service_name替换sid即可
如:
pool = PooledDB(cx_Oracle, user = "trump", password = "123456", dsn = "192.168.1.12:1523/EE.oracle.docker",mincached=2,maxcached=2,maxshared=2,maxconnections=2)
启动成功!