if any node get error in process model how we can rectify weather node is executed or not and how to skip that node if get error and it should continue the flow??

If a node fails then it is up to the Support Team to rectify the error. Presumably you wouldn't want to skip this node (it's writing data to the database, so if you skipped it you'd end up with a data/process integrity issue). One way to continue processing would be to encapsulate the node in a sub-process and put an exception  timer on the sub-process node, but you need to understand the consequences of continuing to process downstream after a failed step in your process.