Linux下DB2SQL1024N A database connection does not exist.

前几天在RedHat Linux 6安装了DB2V10.5，安装过程没报任何错误，但是在后来测试的时候发现一个问题如下：

[db2inst@myrac1 ~]$ db2 connect to sldd user db2inst using db2inst

Database Connection Information

Database server        = DB2/LINUX 10.5.2

SQL authorization ID  = DB2INST

Local database alias  = SLDD

[db2inst@myrac1 ~]$db2 list tables

SQL1024N A database connection does not exist. SQLSTATE=08003

[db2inst@myrac1 ~]$db2 get connection state

全是--，没有连接信息

比较奇怪的是在CLP下么有问题

[db2inst@myrac1 ~]$ db2
(c) Copyright IBM Corporation 1993,2007
Command Line Processor for DB2 Client 10.5.2

You can issue database manager commands and SQL statements from the command
prompt. For example:
    db2 => connect to sample
    db2 => bind sample.bnd

For general help, type: ?.
For command help, type: ? command, where command can be
the first few keywords of a database manager command. For example:
 ? CATALOG DATABASE for help on the CATALOG DATABASE command
 ? CATALOG          for help on all of the CATALOG commands.

To exit db2 interactive mode, type QUIT at the command prompt. Outside
interactive mode, all commands must be prefixed with 'db2'.
To list the current command option settings, type LIST COMMAND OPTIONS.

For more detailed help, refer to the Online Reference Manual.

db2 => connect to sldd user db2inst using db2inst

  Database Connection Information

 Database server        = DB2/LINUX 10.5.2
 SQL authorization ID  = DB2INST
 Local database alias  = SLDD

db2 => list tables

Table/View                      Schema          Type  Creation time           
------------------------------- --------------- ----- --------------------------
ADVISE_INDEX                    DB2INST        T    2014-02-11-00.30.51.141096
ADVISE_INSTANCE                DB2INST        T    2014-02-11-00.30.50.725861
ADVISE_MQT                      DB2INST        T    2014-02-11-00.30.53.438431
ADVISE_PARTITION                DB2INST        T    2014-02-11-00.30.54.567669
ADVISE_TABLE                    DB2INST        T    2014-02-11-00.30.55.366786
ADVISE_WORKLOAD                DB2INST        T    2014-02-11-00.30.52.033549
DX_AJ_IND_STD                  DB2INST        T    2014-02-11-00.30.25.714475

问题考虑：

1.是不是因为实例用户是db2inst用户而不是db2inst1呢？

经查证不是这个原因，虽然DB2的默认实例用户是db2inst1，但是可以创建其他的实例用户

2.DB2COMM=TCPIP的原因？

设置db2set DB2COMM=TCPIP，问题依旧

最后，在网上找到了解决方案：

[root@myrac1 ~]# vi /etc/services

添加如下两行

DB2_db2inst    60006/tcp

DB2_db2inst_1  60007/tcp

DB2_db2inst_2  60008/tcp

DB2_db2inst_3  60009/tcp

DB2_db2inst_4  60010/tcp

DB2_db2inst_END 60011/tcp

DB2_db2inst1    60012/tcp

db2c_db2inst 50005/tcp  db2inst实例监听端口

db2i_db2inst 50009/tcp  db2inst实例中断端口

DB2_db2inst1_1  60013/tcp

DB2_db2inst1_2  60014/tcp

DB2_db2inst1_3  60015/tcp

[db2inst@myrac1 ~]$ db2 connect to sldd user db2inst using db2inst

  Database Connection Information

 Database server        = DB2/LINUX 10.5.2

 SQL authorization ID  = DB2INST

 Local database alias  = SLDD

[db2inst@myrac1 ~]$ db2 list tables

Table/View                      Schema          Type  Creation time           

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

ADVISE_INDEX                    DB2INST        T    2014-02-11-00.30.51.141096

ADVISE_INSTANCE                DB2INST        T    2014-02-11-00.30.50.725861

ADVISE_MQT                      DB2INST        T    2014-02-11-00.30.53.438431

ADVISE_PARTITION                DB2INST        T    2014-02-11-00.30.54.567669