unixODBC uses a strong thread-locking policy that causes big locks with the default configuration for FreeTDS. Performance of multi-threaded applications can be affected because every operation is serialized. To avoid this problem, choose a threading model in odbcinst.ini.

	[FreeTDS]
	Driver = /usr/local/freetds/lib/libtdsodbc.so
	Threading = 1
	

	[Server1]
	Driver = FreeTDS
	Server = myServer1
	Port = 1433
	

You can use also a connection string e.g. DRIVER=FreeTDS;SERVER=myServer1;PORT=1433;.