DB2-SQL1032N No start database manager command was issued. SQLSTATE=57019

Toad连接DB2数据库实例（db2inst1）时提示如下错误：

ERROR [08001] [IBM] SQL30081N  A communication error has been detected. Communication protocol being used: "TCP/IP".  Communication API being used: "SOCKETS".  Location where the error was detected: "10.6.36.31".  Communication function detecting the error: "selectForConnectTimeout".  Protocol specific error code(s): "0", "*", "*".  SQLSTATE=08001

分析&解决：

（1）登陆服务器，手动连接：

root@P560Qz-p1-mon:/>su - db2inst1
[YOU HAVE NEW MAIL]
$ 
$ 
$ db2
db2 => 
db2 => connect to mbdb
SQL1032N  No start database manager command was issued.  SQLSTATE=57019
db2 => 

说明：DB2数据库管理器没有启动。

（2）启动管理器，OK！

$ db2start
07/07/2014 14:46:33     0   0   SQL1063N  DB2START processing was successful.
SQL1063N  DB2START processing was successful.
$ 
$ db2
db2 => connect to mbdb


   Database Connection Information


 Database server        = DB2/AIX64 9.7.5
 SQL authorization ID   = DB2INST1
 Local database alias   = MBDB


db2 =>