aix 5.3下安装了informix client csdk，配置了数据源，无法连接数据库。

arenxl

env命令中已经有了如下变量
INFORMIXDIR=/opt/informix2.9
。。。
INFORMIXSERVER=nmosserver1
ODBCINI=/odbc.ini

/odbc.ini的内容如下：
[ODBC Data Sources]
nmosdb=IBM INFORMIX ODBC DRIVER
;
; Define ODBC Database Driver's Below - Driver Configuration Section
;
[Infdrv1]
Driver=/extra/informix/lib/cli/iclit09b.so
Description=IBM INFORMIX ODBC DRIVER
Database=stores_demo
LogonID=odbc
pwd=odbc
Servername=ids_server1


[Infdrv2]
Driver=/extra/informix/lib/cli/iclis09b.so
Description=IBM INFORMIX ODBC DRIVER
Database=stores_demo
LogonID=odbc
pwd=odbc
Servername=ids_server2
CursorBehavior=0
CLIENT_LOCALE=en_us.8859-1
DB_LOCALE=en_us.8859-1
TRANSLATIONDLL=/extra/informix/lib/esql/igo4a304.so


[ODBC]
;uncomment the below line for UNICODE connection
;UNICODE=UCS-4


Trace=1
TraceFile=/tmp/odbctrace.out
InstallDir=/opt/informix2.9

[nmosdb]
Driver=/opt/informix2.9/lib/cli/iclis09b.so
Description=IBM INFORMIX ODBC DRIVER
Database=nmosdb
LogonID=usr
Password=pass
ServerName=nmosserver1

请大家帮我看看是什么原因呢？执行SQLConnect的时候程序出错，无法连接到数据库