A320
Flight Crew Last 90 Days 170; Flight Crew Type 8412
Aircraft Equipment Problem Critical
Flight Crew Inflight Shutdown; Flight Crew Landed in Emergency Condition
Aircraft
At a cruise altitude of 34;000 feet and just prior to our top of descent point; the First Officer (FO) recognized a decreasing oil quantity situation with our number two engine.  I used ACARS to send a [message] to Dispatch; turned on seat belt sign and called the Purser to inform her of the impending situation. ACARS returned with a frequency for contact as the FO took over flying duties. [Maintenance] joined the call and we discussed what we should do. We decided to operate engine at idle. The First Officer asked for a lower altitude. As we were approaching the top of descent point; the oil quantity continued to decrease to 3.5 and we decided to shut the engine down to prevent any further damage. I took over the flying duties; as the FO completed the engine shut down and single engine drift down check lists. Again communicated with the Purser. We did not prep the cabin; but asked her to do a quick review as we'd be landing shortly. The rest of the approach and landing was uneventful. Well; as can be with one engine.
[Report narrative contained no additional information.]
An A320 flight crew reported an inflight shutdown of the number 2 engine following a loss of oil quantity.