Durable functions in database systems

A database system for implementing one or more functions which are configured to operate on data stored in the database system, the database system comprising:

• one or more processors;
• and
• storage comprising computer-executable instructions which, when executed by the one or more processors, cause the database system to:
• obtain first data representing a set of one or more operations to be performed on data in a database managed by a database system;
• derive second data from the first data, the second data representing a function definition for implementation in the database system, wherein the function definition includes the set of operations and a set of one or more state variables;
• and
• generate a function according to the second data, wherein generating the function comprises storing a set of one or more values for respective ones of the state variables, wherein the set of values are stored in an isolated computing environment in the database system, the function being configured to operate on the set of values in the isolated computing environment.

A non-transitory computer-readable storage medium comprising computer-executable instructions which, when executed by one or more processors, cause the one or more processors to:

• obtain first data representing a set of one or more operations to be performed on data in a database managed by a database system;
• derive second data from the first data, the second data representing a function definition for implementation in the database system, wherein the function definition includes the set of operations and a set of one or more state variables;
• and
• generate a function according to the second data, wherein generating the function comprises storing a set of one or more values for respective ones of the state variables,
• wherein the set of values are stored in an isolated computing environment in the database system, the function being configured to operate on the set of values in the isolated computing environment.