append data from sde feature class to an other hangs

Hi,

We have a process in vb.net (arcgis 10.1) that is used to delete sde feature class on a oracle db instance
and then append the data from an other database instance.

Many tables are proccessed one after the other. The process starts working properly and then after
processing some tables the process does the delete and starts the append procedure and does nothing.

it hangs there.

The process remains active in task manager, but the cpu is at 0 it may remains like that hours until I decide to
kill it.

Someone has and an idea?

Thanks