The volume of information in the libraries of Andalusian Spain (Toledo, Cordoba and Granada) truly dwarfed what was available in most of Christendom at the time. Andalusian libraries and their affiliated network of local suppliers:
churned out as many as 60,000 treatises, poems, polemics and
compilations a year. [...] This level of industry was in sharp
I don't have much relevant expertise, but am inclined to question the uniqueness of Al-Andalus on both points.
First, the case can be made that Islam in general was more tolerant of Jews then Christian rulers were. The Wikipedia article on the Muslim concept of dhimmi or "protected peoples" quotes a scholar who asserts:
The legal and security situation ...