在clinet连接数据库时为提示：

ora-12528 : message 12528 not found; product=RDBMS ; facility=ora

解决办法：

(-)：

先连接到实例t1cdp1,然后shutdown abort,接着startup nomount(忘记了接下来是否执行了alter database mount),此时就退出了登陆,再次尝试登陆的时候就报错：

SQL> conn

iat/welcome@t1cdp1

ERROR:

ORA-12528: TNS:listener: all appropriate instances are blocking new connections

1. cmd下面输入lsnrctl,查看当前实例所有监听器的状态

C:\>lsnrctl

LSNRCTL for 32-bit Windows: Version 10.2.0.3.0 - Production on 20-JUN-2010 22:49:13

Copyright (c) 1991, 2006,

Oracle. All rights reserved.

Welcome to LSNRCTL, type "help" for information.

LSNRCTL> status

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1)))

STATUS of the LISTENER

------------------------

Alias                     LISTENER

Version                   TNSLSNR for 32-bit Windows: Version 10.2.0.3.0 - Production

Start Date                30-APR-2010 14:37:44

Uptime                    51 days 8 hr. 11 min. 32 sec

Trace Level               off

Security                  ON: Local OS Authentication

SNMP                      OFF

Listener Parameter File   C:\oracle\product\10.2.0\db_1\network\admin\listener.ora

Listener Log File         C:\oracle\product\10.2.0\db_1\network\log\listener.log

Listening Endpoints Summary...

(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC1ipc)))

(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=SupplyChainRel3.corp.walmart.com)(PORT=1521)))

Services Summary...

Service "PLSExtProc" has 1 instance(s).

Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...

Service "T1CDP1_XPT" has 1 instance(s).

Instance "t1cdp1", status BLOCKED, has 1 handler(s) for this service...Service "T1FMSP2XDB" has 1 instance(s).

Instance "t1fmsp2", status READY, has 1 handler(s) for this service...

Service "T1FMSP2_XPT" has 1 instance(s).

Instance "t1fmsp2", status READY, has 1 handler(s) for this service...

Service "T1PINVS1XDB" has 1 instance(s).

Instance "t1pinvs1", status READY, has 1 handler(s) for this service...

Service "T1PINVS1_XPT" has 1 instance(s).

Instance "t1pinvs1", status READY, has 1 handler(s) for this service...

Service "T1PPROD_XPT" has 1 instance(s).

Instance "t1pprod", status BLOCKED, has 1 handler(s) for this service...

Service "t1cdp1" has 1 instance(s).

Instance "t1cdp1", status BLOCKED, has 1 handler(s) for this service...Service "t1fmsp2" has 1 instance(s).

Instance "t1fmsp2", status READY, has 1 handler(s) for this service...

Service "t1pinvs1" has 1 instance(s).

Instance "t1pinvs1", status READY, has 1 handler(s) for this service...

Service "t1pprod" has 1 instance(s).

Instance "t1pprod", status BLOCKED, has 1 handler(s) for this service...

The command completed successfully

可以发现instance t1cdp1是blocked的状态(不知道

T1CDP1_XPT这个后缀是什么意思)，

此时可以确定是监听器出错了。

2. 以sysdba身份登录 sqlplus \ as sysdba

查看发现当前状态为nomount(找到问题根源了).接下来加载

数据库

alter dababase mount;

alter database open;

3. 此时再次尝试连接数据库，成功登陆

SQL> conn

iat/welcome@t1cdp1

Connected.

小结：其实碰到这种错误，可以直接通过sqlplus \ as sysdba进入查看instance状态，而是用lsnrctl则是为了进一步验证而已。

方法(二)

关闭数据数据库，重新启动数据库即可。重新启动监听。