问题现象： 数据库客户端进程数据库连接成功后，再把跟数据库交互的网卡down掉，客户端进程就会阻塞，无法进行其他处理。该问题跟TCP keepalive机制有关。
可以在odbc.ini文件中增加相应的属性来解决，在odbc.ini 增加如下内容：
pqopt = keepalives=1 keepalives_idle=5 keepalives_count=1 keepalives_interval=1
odbc.ini：
[sles12-1]
Description = PostgreSQL connection to rtpdb
Driver = PostgreSQL
Database = rtpdb
pqopt = keepalives=1 keepalives_idle=5 keepalives_count=1 keepalives_interval=1
Servername = sles12-1
Username =
Password =
Port = 5432
Protocol = 7.4+
ReadOnly = No
RowVersioning = No
ShowSystemTables = No
参考链接：Thread: ODBC cliens is hanging if network connection is broken : Postgres Professional