Buffered message queue architecture for database management systems with memory optimizations and "zero copy" buffered message queue
First Claim
1. A method for managing messages in a database system, the method comprising the computer-implemented steps of:
- a first process that is executing in the database system, creating, in a first portion of a volatile memory in the database system, a message in a native format of the first process, wherein the first portion of the volatile memory is associated with the first process;
the first process causing a reference to the message to be enqueued into a message queue that is disposed in the volatile memory separate from the first portion of the volatile memory; and
the first process causing the message to be enqueued directly from the first portion of the shared memory into the message queue.
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Abstract
A buffered message queue architecture for managing messages in a database management system is disclosed. A “buffered message queue” refers to a message queue implemented in a volatile memory, such as a RAM. The volatile memory may be a shared volatile memory that is accessible by a plurality of processes. The buffered message queue architecture supports a publish and subscribe communication mechanism, where the message producers and message consumers may be decoupled from and independent of each other. The buffered message queue architecture provides all the functionality of a persistent publish-subscriber messaging system, without ever having to store the messages in persistent storage. The buffered message queue architecture provides better performance and scalability since no persistent operations are needed and no UNDO/REDO logs need to be maintained. Messages published to the buffered message queue are delivered to all eligible subscribers at least once, even in the event of failures, as long as the application is “repeatable.” The buffered message queue architecture also includes management mechanisms for performing buffered message queue cleanup and also for providing unlimited size buffered message queues when limited amounts of shared memory are available. The architecture also includes “zero copy” buffered message queues and provides for transaction-based enqueue of messages.
123 Citations
18 Claims
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1. A method for managing messages in a database system, the method comprising the computer-implemented steps of:
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a first process that is executing in the database system, creating, in a first portion of a volatile memory in the database system, a message in a native format of the first process, wherein the first portion of the volatile memory is associated with the first process;
the first process causing a reference to the message to be enqueued into a message queue that is disposed in the volatile memory separate from the first portion of the volatile memory; and
the first process causing the message to be enqueued directly from the first portion of the shared memory into the message queue. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A computer-readable medium for managing messages in a database system, the computer-readable medium carrying one or more sequences of instructions which, when executed by one or more processors, cause the one or more processors to perform the steps of:
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a first process that is executing in the database system, creating, in a first portion of a volatile memory in the database system, a message in a native format of the first process, wherein the first portion of the volatile memory is associated with the first process;
the first process causing a reference to the message to be enqueued into a message queue that is disposed in the volatile memory separate from the first portion of the volatile memory; and
the first process causing the message to be enqueued directly from the first portion of the shared memory into the message queue. - View Dependent Claims (8, 9, 10, 11, 12)
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13. An apparatus for managing messages in a database system, the apparatus comprising a memory carrying one or more sequences of instructions which, when executed by one or more processors, cause the one or more processors to perform the steps of:
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a first process that is executing in the database system, creating, in a first portion of a volatile memory in the database system, a message in a native format of the first process, wherein the first portion of the volatile memory is associated with the first process;
the first process causing a reference to the message to be enqueued into a message queue that is disposed in the volatile memory separate from the first portion of the volatile memory; and
the first process causing the message to be enqueued directly from the first portion of the shared memory into the message queue. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification