Resuming execution of an execution plan in a virtual machine

A computer-readable storage medium encoded with instructions, wherein the instructions when executed comprise:

• executing, at a first virtual machine, a query implemented by a first execution plan;
• in response to a command that requests a shutdown of the first virtual machine while the first virtual machine is executing the query implemented by the first execution plan, saving an attribute of a resource used by the executing at the first virtual machine to memory allocated to the first virtual machine and saving a driver source used by the executing at the first virtual machine to the memory allocated to the first virtual machine, wherein the driver source comprises a state of partial execution of the first execution plan;
• in response to a command that requests starting a second virtual machine, determining whether the driver source that comprises the state of the partial execution of the first execution plan exists in memory allocated to the second virtual machine;
• and
• if the driver source that comprises the state of the partial execution of the first execution plan exists in the memory allocated to the second virtual machine, determining whether the attribute of the resource used by the executing of the first virtual machine is within a threshold difference from an attribute of a resource allocated to the second virtual machine.

A computer system comprising:

• a processor;
• and
• memory communicatively coupled to the processor, wherein the memory is encoded with instructions, wherein the instructions when executed by the processor comprise:
• executing, at a first virtual machine, a query implemented by a first execution plan,
• saving a first attribute of a resource used by the executing at the first virtual machine to the memory and saving a driver source used by the executing at the first virtual machine to the memory, wherein the driver source comprises a state of partial execution of the first execution plan,
• in response to a change in the first attribute of the resource to a second attribute, determining whether the first attribute of the resource used by the executing of the first virtual machine is within a threshold difference from the second attribute of the resource, and
• if the first attribute of the resource used by the executing of the first virtual machine is within the threshold difference from the second attribute of the resource, continuing execution of the query using the first execution plan starting from the state of the partial execution of the first execution plan.