Java程序访问Oracle数据库集群与非集群的不同连接字符串
1.oracle非集群中java程序连接的url
url=jdbc:oracle:thin:@host_ip:1521:dbname
2.oracle集群中java程序连接的url
url=jdbc:oracle:thin:@(DESCRIPTION =(ADDRESS = (PROTOCOL = TCP)(HOST =db1)(PORT = 1521))(ADDRESS = (PROTOCOL = TCP)(HOST =db2)(PORT = 1521))(LOAD_BALANCE=yes)(CONNECT_DATA =(SERVER = DEDICATED)(SERVICE_NAME = dbname)))
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DBC 的应用连接Oracle 遇到问题，错误如下：
ORA-12505,TNS:listener does not currently know of SID given in connect descriptor TheConnection descriptor used by the client was。
我在DB 层面配置了静态注册，并且GLOBAL_DBNAME和SID_NAME 不一样，以往的配置都是一样的，所以没有发现这个问题。
(SID_DESC =
(GLOBAL_DBNAME = dave)
(ORACLE_HOME =D:\app\Administrator\product\11.2.0\dbhome_1)
(SID_NAME = NEWCCS)
)
http://blog.csdn.net/tianlesoftware/article/details/5543166
JDBC Thin Driver 的formats 有三种格式：
格式一: Oracle JDBC Thin using a ServiceName:
jdbc:oracle:thin:@//<host>:<port>/<service_name>
Example: jdbc:oracle:thin:@//192.168.2.1:1521/XE
注意这里的格式，@后面有//, 这是与使用SID的主要区别。
这种格式是Oracle 推荐的格式，因为对于集群来说，每个节点的SID 是不一样的，但是SERVICE_NAME 确可以包含所有节点。
格式二: Oracle JDBC Thin using an SID:
jdbc:oracle:thin:@<host>:<port>:<SID>
Example: jdbc:oracle:thin:192.168.2.1:1521:X01A
Note: Support for SID is being phased out. Oracle recommends that users switch over to usingservice names.
格式三：Oracle JDBC Thin using a TNSName:
jdbc:oracle:thin:@<TNSName>
Example: jdbc:oracle:thin:@GL
Note:
Support for TNSNames was added in the driver release 10.2.0.1