In this paper, we study composition operators on a Banach space of ana
lytic functions, denoted by X, which includes the Bloch space. This sp
ace arises naturally as the dual space of analytic functions in the Be
rgman space L-alpha(1)(D) which admit an atomic decomposition. We char
acterise the functions which induce compact composition operators and
those which induce Fredholm operatorson this space. We also investigat
e when a composition operator has a closed range.