When developing a data security policy, you need to become familiar with several concepts, such as constrained tables, primary tables, policy queries, and context. This section outlines these concepts.
• Constrained table: A constrained table is the table or tables in a given security policy from which data is filtered or secured, based on the associated policy query. For example, in a policy that secures all sales orders based on the customer group, the SalesOrder table would be the constrained table. Constrained tables are always explicitly related to the primary table in the policy.
• Primary table: A primary table is used to secure the content of the related constrained table. For example, in a policy that secures all sales orders based on the customer group, the Customer table would be the primary table.
• Policy query: A policy query is used to secure the constrained tables specified in a given extensible data security policy. This query will return data from a primary table that is then used to secure the contents of the constrained table.
• Context: A policy context is a piece of information that controls the circumstances under which a given policy is considered to be applicable. If this context is not set, then the policy, even if enabled, is not enforced. Contexts can be of two types:
o A role context enables policy application based on the role or roles to which the user has been assigned.
o An application context enables policy application based on information set by the application.
• Constrained table: A constrained table is the table or tables in a given security policy from which data is filtered or secured, based on the associated policy query. For example, in a policy that secures all sales orders based on the customer group, the SalesOrder table would be the constrained table. Constrained tables are always explicitly related to the primary table in the policy.
• Primary table: A primary table is used to secure the content of the related constrained table. For example, in a policy that secures all sales orders based on the customer group, the Customer table would be the primary table.
• Policy query: A policy query is used to secure the constrained tables specified in a given extensible data security policy. This query will return data from a primary table that is then used to secure the contents of the constrained table.
• Context: A policy context is a piece of information that controls the circumstances under which a given policy is considered to be applicable. If this context is not set, then the policy, even if enabled, is not enforced. Contexts can be of two types:
o A role context enables policy application based on the role or roles to which the user has been assigned.
o An application context enables policy application based on information set by the application.
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