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11. 发明授权

US11586614B2 Native persistent store support for blockchains 有权
公开(公告)号：US11586614B2
公开(公告)日：2023-02-21
申请号：US16932633
申请日：2020-07-17
申请人： Oracle International Corporation
发明人： James W. Stamos , Mahesh Baburao Girkar , Wei Ming Hu , Juan R. Loaiza , Sachin Vijaykumar Sonawane , Hongjie Yang
IPC分类号： G06F16/23 , G06F16/21 , H04L9/06 , H04L9/00
摘要： Distributed ledgered data is stored within a distributed persistent storage system comprising multiple persistent storage systems as distributed ledgered participants. In various embodiments, the distributed ledgered data is maintained using the native capabilities of a persistent storage system. The distributed ledgered data is replicated as persistent data objects in a “ledgered repository of objects” that are replicated at each of the persistent storage systems. Changes at one persistent storage system are recorded within a block in a distributed blockchain that is distributed across each of the other distributed ledgered participants. The other distributed ledgered participants read the changes from the blockchain and apply the changes to the respective replicas at each of the other distributed ledgered participants. Hence, this approach is referred to as blockchain apply. Blockchain apply may be used to replicate the repository objects of various forms of PSSs. In a DBMS, a repository of objects is a table, where each record or row is an object in the repository. In a file system, a repository of objects is a directory, where each directory and file therein is an object in the repository. In a document storage system (DOCS), a repository of objects is a collection of documents, where each document is an object in the repository.

12. 发明授权

US09996404B2 Message cache management for message queues 有权
公开(公告)号：US09996404B2
公开(公告)日：2018-06-12
申请号：US15254278
申请日：2016-09-01
申请人： Oracle International Corporation
发明人： Mukesh Jaiswal , Shubha Bose , James W. Stamos , Alan R. Downing , Devendra Singh
IPC分类号： G06F3/00 , G06F9/44 , G06F9/48 , G06F13/00 , G06F9/54 , G06F12/0875
CPC分类号： G06F9/546 , G06F12/0875 , G06F2209/548 , G06F2212/453
摘要： A method and apparatus for message cache management for message queues is provided. A plurality of messages from a plurality of enqueuers are enqueued in a queue comprising one or more shards, each shard comprising one or more subshards. A message cache is maintained in memory. Enqueuing a message includes enqueuing the message in a current subshard of a particular shard, which includes storing the message in a cached subshard corresponding to the current subshard of the particular shard. For each dequeuer-shard pair, a dequeue rate is determined. Estimated access time data is generated that includes an earliest estimated access time for each of a plurality of subshards based on the dequeuer-shard pair dequeue rates. A set of subshards is determined for storing as cached subshards in the message cache based on the earliest estimated access times for the plurality of subshards.

13. 发明授权

US11080255B2 Space-efficient bookkeeping for database applications 有权
公开(公告)号：US11080255B2
公开(公告)日：2021-08-03
申请号：US16030757
申请日：2018-07-09
申请人： Oracle International Corporation
发明人： James W. Stamos , Mukesh Jaiswal
IPC分类号： G06F16/22 , G06F16/23
摘要： A method is provided for space-efficient bookkeeping using bit-level locking. Each row of a bookkeeping table stores binary data comprising a plurality of bits. Each bit of the plurality of bits corresponds to a particular message and a particular consumer of the message, and indicates whether the particular message has been dequeued by the particular consumer. The bookkeeping table is stored on-disk and data corresponding to the bookkeeping table is stored in volatile memory. When a message is dequeued the in-memory bookkeeping data is updated, and the bookkeeping table is updated based on the in-memory bookkeeping data when the dequeue is committed.

14. 发明申请

US20210034606A1 NATIVE PERSISTENT STORE SUPPORT FOR BLOCKCHAINS 有权
公开(公告)号：US20210034606A1
公开(公告)日：2021-02-04
申请号：US16932633
申请日：2020-07-17
申请人： Oracle International Corporation
发明人： James W. Stamos , Mahesh Baburao Girkar , Wei Ming Hu , Juan R. Loaiza , Sachin Vijaykumar Sonawane , Hongjie Yang
IPC分类号： G06F16/23 , G06F16/21 , H04L9/06
摘要： Distributed ledgered data is stored within a distributed persistent storage system comprising multiple persistent storage systems as distributed ledgered participants. In various embodiments, the distributed ledgered data is maintained using the native capabilities of a persistent storage system. The distributed ledgered data is replicated as persistent data objects in a “ledgered repository of objects” that are replicated at each of the persistent storage systems. Changes at one persistent storage system are recorded within a block in a distributed blockchain that is distributed across each of the other distributed ledgered participants. The other distributed ledgered participants read the changes from the blockchain and apply the changes to the respective replicas at each of the other distributed ledgered participants. Hence, this approach is referred to as blockchain apply. Blockchain apply may be used to replicate the repository objects of various forms of PSSs. In a DBMS, a repository of objects is a table, where each record or row is an object in the repository. In a file system, a repository of objects is a directory, where each directory and file therein is an object in the repository. In a document storage system (DOCS), a repository of objects is a collection of documents, where each document is an object in the repository.

15. 发明申请

US20200012736A1 SPACE-EFFICIENT BOOKKEEPING FOR DATABASE APPLICATIONS 审中-公开
公开(公告)号：US20200012736A1
公开(公告)日：2020-01-09
申请号：US16030757
申请日：2018-07-09
申请人： Oracle International Corporation
发明人： James W. Stamos , Mukesh Jaiswal
IPC分类号： G06F17/30
摘要： A method is provided for space-efficient bookkeeping using bit-level locking. Each row of a bookkeeping table stores binary data comprising a plurality of bits. Each bit of the plurality of bits corresponds to a particular message and a particular consumer of the message, and indicates whether the particular message has been dequeued by the particular consumer. The bookkeeping table is stored on-disk and data corresponding to the bookkeeping table is stored in volatile memory. When a message is dequeued the in-memory bookkeeping data is updated, and the bookkeeping table is updated based on the in-memory bookkeeping data when the dequeue is committed.

16. 发明申请

US20190179613A1 AVOIDING HOT SPOTS DURING INGEST WHERE INGEST ORDERING MUST BE PRESERVED 审中-公开
公开(公告)号：US20190179613A1
公开(公告)日：2019-06-13
申请号：US15841149
申请日：2017-12-13
申请人： Oracle International Corporation
发明人： James W. Stamos , Devendra Singh
IPC分类号： G06F5/06 , G06F17/30
摘要： Techniques are described herein for achieving physically dispersed item-dispersal patterns in queue tables that are used as circular buffers in a FIFO system. The techniques achieve the physically dispersed item-dispersal patterns while retaining FIFO semantics, efficient data ingest, efficient data access, and low latency for both fixed and variable-size ingest data. Because consecutively inserted rows are written to physically dispersed locations on persistent storage, lock contention between concurrent ingest sessions is significantly reduced. Once a physically dispersed item-dispersal pattern is established for a first set of inserted rows, subsequent rows are added by overwriting the existing rows. The physical dispersal of the initial rows may be accomplished by setting values in a slot number column such that updates that are made in a sequence that is based on the slot number column exhibit a desired physical dispersal pattern.

17. 发明申请

US20180060145A1 MESSAGE CACHE MANAGEMENT FOR MESSAGE QUEUES 有权
公开(公告)号：US20180060145A1
公开(公告)日：2018-03-01
申请号：US15254278
申请日：2016-09-01
申请人： Oracle International Corporation
发明人： Mukesh Jaiswal , Shubha Bose , James W. Stamos , Alan R. Downing , Devendra Singh
IPC分类号： G06F9/54 , G06F12/0875
CPC分类号： G06F9/546 , G06F12/0875 , G06F2209/548 , G06F2212/453
摘要： A method and apparatus for message cache management for message queues is provided. A plurality of messages from a plurality of enqueuers are enqueued in a queue comprising one or more shards, each shard comprising one or more subshards. A message cache is maintained in memory. Enqueuing a message includes enqueuing the message in a current subshard of a particular shard, which includes storing the message in a cached subshard corresponding to the current subshard of the particular shard. For each dequeuer-shard pair, a dequeue rate is determined. Estimated access time data is generated that includes an earliest estimated access time for each of a plurality of subshards based on the dequeuer-shard pair dequeue rates. A set of subshards is determined for storing as cached subshards in the message cache based on the earliest estimated access times for the plurality of subshards.

18. 发明授权

US09569514B2 Statement-level and procedural-level replication 有权
标题翻译：语句级和程序级复制
公开(公告)号：US09569514B2
公开(公告)日：2017-02-14
申请号：US14052531
申请日：2013-10-11
申请人： Oracle International Corporation
发明人： Edwina M. Lu , James W. Stamos , Nimar S. Arora , Lik Wong , Haobo Xu , Thuvan Hoang , Byron Wang , Lakshminarayanan Chidambaran
IPC分类号： G06F17/30
CPC分类号： G06F17/30575 , G06F17/30578
摘要： Techniques for replicating data in database systems are described. In an example embodiment, a set of changes is received at a destination database, where the set of changes has been applied at a source database and is being replicated from the source database to the destination database. The set of changes is analyzed and it is determined that the set of changes includes two or more of: a subset of row-level changes, a subset of statement-level changes, and a subset of procedure-level changes. A set of dependencies is determined at least between the changes that are included in the subsets of changes. The changes, in the subsets of changes, are assigned to two or more processing elements. The set of changes is applied to the destination database by executing the two or more processing elements in parallel to each other and based on the set of dependencies.
摘要翻译：描述了在数据库系统中复制数据的技术。在示例实施例中，在目的地数据库处接收一组改变，其中该变更集合已经在源数据库处应用并且正在从源数据库复制到目的地数据库。分析一组变化，并且确定该组更改包括以下两个或多个：行级更改的子集，语句级更改的子集以及过程级更改的子集。至少在更改子集中包含的更改之间确定一组依赖关系。更改子集中的更改分配给两个或多个处理元素。通过相互并行并基于一组依赖关系执行两个或多个处理元件，将该组更改应用于目的地数据库。

19. 发明授权

US09495296B2 Handling memory pressure in an in-database sharded queue 有权
标题翻译：处理数据库内的分片队列中的内存压力
公开(公告)号：US09495296B2
公开(公告)日：2016-11-15
申请号：US14165974
申请日：2014-01-28
申请人： Oracle International Corporation
发明人： Sunitha Subramanyam , Shubha Bose , Anil Madan , Devendra Singh , James W. Stamos , Mukesh Jaiswal
IPC分类号： G06F17/30 , G06F12/08
CPC分类号： G06F12/0848 , G06F12/0868 , G06F17/30067 , G06F2212/465
摘要： Handling memory pressure in an in-database sharded queue is described. Messages from a plurality of enqueuers are stored in a plurality of shards of a sharded queue. Messages from a first enqueuer are stored in a first shard. A queue table corresponding to the sharded queue is maintained. In volatile memory, a plurality of message caches is maintained, each message cache corresponding to a shard of the plurality of shards. Memory pressure is detected based on memory usage of the volatile memory. To store a specific message from the enqueuer, the specific message is stored in rows of the queue table that are assigned to the first shard. When memory pressure is not detected, the specific message is stored in a first message cache corresponding to the first shard. Subscribers of the sharded queue are caused to dequeue messages from the plurality of shards.
摘要翻译：描述处理数据库内的分片队列中的内存压力。来自多个入站者的消息被存储在分片队列的多个分片中。来自第一个进入者的消息存储在第一个分片中。维护与分片队列对应的队列表。在易失性存储器中，维护多个消息高速缓存，每个消息高速缓存对应于多个分片中的分片。基于易失性存储器的存储器使用来检测存储器压力。要从进入者存储特定消息，特定消息存储在分配给第一个分片的队列表的行中。当未检测到存储器压力时，特定消息存储在与第一分片对应的第一消息高速缓存中。导致分片队列的订阅者从多个分片中发出消息。

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