服务什么的都开启了，
还有这是我的listener.ora

listener.ora Network Configuration File: D:\oracle\product\11.2.0\dbhome_1\network\admin\listener.ora

Generated by Oracle configuration tools.

SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = CLRExtProc)
(ORACLE_HOME = D:\oracle\product\11.2.0\dbhome_1)
(PROGRAM = extproc)
(ENVS = "EXTPROC_DLLS=ONLY:D:\oracle\product\11.2.0\dbhome_1\bin\oraclr11.dll")
)
)

LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
)
)

ADR_BASE_LISTENER = D:\oracle
以及sqlnet.ora

sqlnet.ora Network Configuration File: D:\oracle\product\11.2.0\dbhome_1\network\admin\sqlnet.ora

Generated by Oracle configuration tools.

This file is actually generated by netca. But if customers choose to

install "Software Only", this file wont exist and without the native

authentication, they will not be able to connect to the database on NT.

SQLNET.AUTHENTICATION_SERVICES= (NTS)

NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)

和tnsnames.ora

tnsnames.ora Network Configuration File: D:\oracle\product\11.2.0\dbhome_1\network\admin\tnsnames.ora

Generated by Oracle configuration tools.

ORCALE =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcale)
)
)

ORACLR_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
)
(CONNECT_DATA =
(SID = CLRExtProc)
(PRESENTATION = RO)
)
)

LISTENER_ORCALE =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))

oracle10g
oracle10g
sqlplus "/as sysdba"
SQL>startup
SQL>exit
sqlplus openlab/open123
sqlplus system/abc123
这个是oracle10g的服务器启动

启动服务器：
1、lsnrctl start
2、set ORACLE_SID=db12c
3、sqlplus /nolog
4、conn /as sysdba
5、startup
另外的启动方式。

你可以打开cmd > sqlplus /nolog
sql> conn username/password@oracle;
这样就可以登上去了，如果用PLSQL登陆，先用conn sys/sys as sysdba;
alter user system username by 123456;
然后用PLSQL就能登陆，另外还要配置环境变量的，你可以百度。