Oracle dblink调用函数报ORA-00904 标识符无效

select STRSPLIT@gg_DBLINK('a,b,c') from dual;
ORA-00904: "STRSPLIT" 标识符无效
但是有时候是可以的，查看dblink定义，如下：
create database link gg_DBLINK
connect to username identified by password
using '(DESCRIPTION=
(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=10.15.26.4)(PORT=1521)))
(CONNECT_DATA=(SERVICE_NAME=gggd)))';

了解到远程的数据是RAC的，两个节点。应该写成如下形式，否则有时候会找不到机器，10.15.26.4是VIP。

create database link gg_DBLINK
connect to username identified by password
using 'DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.15.26.2)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.15.26.4)(PORT = 1521))
(LOAD_BALANCE = yes)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = gggd)
(FAILOVER_MODE =
(TYPE = SELECT)
)
)
)';
ora-12169:TNs:指定为连接标识符的Net服务名太长

最后使用下面的就成功了： create database link gg_DBLINK connect to username identified by password using '(DESCRIPTION= (ADDRESS = (PROTOCOL = TCP)(HOST = 10.15.26.2)(PORT = 1521)) (ADDRESS = (PROTOCOL = TCP)(HOST = 10.15.26.4)(PORT = 1521)) (CONNECT_DATA=(SERVICE_NAME=gggd)))';

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