We give an overview of the measurement performed by the CDF experiment
at the Tevatron collider that recently allowed the definitive observation of the
flavor oscillation phenomenon in the B0s- \bar B0s system.
Random fluctuations have now been excluded at the 5.4 \sigma level and the
oscillation frequency measured with 0.7 % precision.
We will also discuss measurements that currently constrain the Bs mixing phase, and the future prospects for Bs physics at the Tevatron.