Error: ORA-16501: the Data Guard broker operation failed ORA-16625: cannot reach database解决

在备库上建配置文件
DGMGRL> create configuration 'sharkdbbork' as primary database is 'sharkdb' connect identifier is sharkdb;
Error: ORA-16501: the Data Guard broker operation failed
Error: ORA-16625: cannot reach database "sharkdb"

查看日志
oracle@dg:[/u01/app/database/diag/rdbms/posdg/sharkdb/trace]cat drcsharkdb.log 
2013-08-30 16:11:21.758                      ERROR: Connect Identifier sharkdb_dgmgrl not valid
2013-08-30 16:11:21.759                      NSV0: Can't get db connect descriptor to database sharkdb (error=16501)
2013-08-30 16:11:21.759                      NSV0: Failed to connect to 0x01001000
2013-08-30 16:11:21.759                      NSV0: Failed to send message to site sharkdb. Error code is ORA-16501.
2013-08-30 16:11:21.760 00000000  1450113128 DMON: failed to forward op ADD_DRC to site sharkdb with error ORA-16501
2013-08-30 16:11:21.760 00000000  1450113128 DMON: Database sharkdb returned ORA-16501
2013-08-30 16:11:21.760 00000000  1450113128       for opcode = ADD_DRC, phase = NULL, req_id = 2.1.1450113128
2013-08-30 16:11:21.761 00000000  1450113128 DMON: ADD_DRC operation completed

oracle@dg:[/u01/app/database/diag/rdbms/posdg/sharkdb/trace]  ps -ef|grep dmon
oracle    4589     1  0 Aug27 ?        00:00:00 ora_dmon_sharkdb
oracle   16577 16462  0 16:13 pts/3    00:00:00 grep --color dmon
oracle@dg:[/u01/app/database/diag/rdbms/dg/sharkdb/trace]
监听正常
LSNRCTL> status
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER)))
STATUS of the LISTENER
------------------------
Alias                     LISTENER
Version                   TNSLSNR for Linux: Version 11.2.0.1.0 - Production
Start Date                28-AUG-2013 18:40:34
Uptime                    1 days 21 hr. 46 min. 4 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /u01/app/11.2.0/grid/network/admin/listener.ora
Listener Log File         /u01/app/grid/diag/tnslsnr/node1/listener/alert/log.xml
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=1521)))
Services Summary...
Service "sharkdb" has 1 instance(s).
  Instance "sharkdb", status UNKNOWN, has 1 handler(s) for this service...
Service "sharkdb_DGMGRL" has 1 instance(s).
  Instance "sharkdb", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully