Cloud services are on-demand Therefore there is a level of calculated risk in allocating all the resources of a cloud service, because resources are allocated according to statistical projections. In accurate modelling of resources usage common resources allocation algorithms are vulnerable to distortions of fairness or inadequate resource provisioning and inadequate investments in infrastructure.

Authorization is the process of granting of right to access to a user, program or process. It should not be confused with Authentication.

PaaS utilizes the following data storage types:
Structured: Information with a high degree of organisation, such that inclusion in a relational database is seam less and readily searchable by simple, straightforward search engine algorithms or other search operations.
Unstructured: Information that does not reside in a traditional row-column database.
Unstructured data files often include text and multimedia content. Examples include email messages, word processing documents, videos, photos, audio files, presentations, web pages, and many other kinds of business documents. Although these sorts of files may have an internal structure, they are still considered unstructured because the data they contain does not fit neatly in a database.