TNS:could not resolve the connect identifier specified

[oracle@localhost admin]$ sqlplus system/Abcd1234@newDatabase
SQL*Plus: Release 12.1.0.1.0 Production on Sun Sep 21 16:55:43 2014
Copyright (c) 1982, 2013, Oracle. All rights reserved.
ERROR:
ORA-12154: TNS:could not resolve the connect identifier specified
Enter user-name:
sqlnet.ora文件的内容：
# sqlnet.ora Network Configuration File: /u01/app/oracle/product/12.1.0/dbhome_1/network/admin/sqlnet.ora
# Generated by Oracle configuration tools.
SQLNET.AUTHENTICATION_SERVICES= (NTS)
NAMES.DIRECTORY_PATH= (TNSNAMES, ONAMES, HOSTNAME)
listener.ora文件的内容：
# listener.ora Network Configuration File: /u01/app/oracle/product/12.1.0/dbhome_1/network/admin/listener.ora
# Generated by Oracle configuration tools.
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = /u01/app/oracle/product/12.1.0/dbhome_1)
(PROGRAM = extproc)
)
(SID_DESC =
(GLOBAL_DBANAME = newDatabase)
(ORACLE_HOME = /u01/app/oracle/product/12.1.0/dbhome_1)
(SID_NAME = newDatabase)
)
)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.122)(PORT = 1521))
)
)
tnsnames.ora文件的内容：
# tnsnames.ora Network Configuration File: /u01/app/oracle/product/12.1.0/dbhome_1/network/admin/tnsnames.ora
# Generated by Oracle configuration tools.
newDatabase =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.112)(PORT = 1521))
)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = newDatabase)
)
)
三个配置文件哪里设置不对了求大神们帮帮忙