公开(公告)号：US20200320010A1

公开(公告)日：2020-10-08

申请号：US16907703

申请日：2020-06-22

Applicant: Oracle International Corporation

Inventor： Juan R. Loaiza ,  J. William Lee ,  Wei-Ming Hu ,  Kothanda Umamageswaran ,  Neil J.S. MacNaughton ,  Adam Y. Lee

IPC: G06F12/0873 ,  G06F16/13 ,  G06F16/172 ,  G06F12/0868 ,  G06F12/0866

Abstract: A method and apparatus for implementing a buffer cache for a persistent file system in non-volatile memory is provided. A set of data is maintained in one or more extents in non-volatile random-access memory (NVRAM) of a computing device. At least one buffer header is allocated in dynamic random-access memory (DRAM) of the computing device. In response to a read request by a first process executing on the computing device to access one or more first data blocks in a first extent of the one or more extents, the first process is granted direct read access of the first extent in NVRAM. A reference to the first extent in NVRAM is stored in a first buffer header. The first buffer header is associated with the first process. The first process uses the first buffer header to directly access the one or more first data blocks in NVRAM.

公开(公告)号：US10742560B2

公开(公告)日：2020-08-11

申请号：US16287521

申请日：2019-02-27

Applicant: Oracle International Corporation

Inventor： Vijay Sridharan ,  Richard Frank ,  Jia Shi ,  Kothanda Umamageswaran ,  Juan Loaiza ,  Alexander Tsukerman ,  Bang Nguyen ,  Sumanta Chatterjee

IPC: H04L12/851 ,  H04L29/08

Abstract: A method and apparatus for intelligent network resource manager for distributed computing systems is provided. A first priority is assigned to a first virtual channel set that includes at least two virtual channels of a plurality of virtual channels associated with a physical communication channel. A second priority is assigned to a second virtual channel set that includes at least one virtual channel of the plurality of virtual channels. The first virtual channel set has more virtual channels than the second virtual channel set. Outbound messages of the first priority are directed to virtual channels of the first virtual channel set. Outbound messages of the second priority are directed to virtual channels of the second virtual channel set. The virtual channels are processed in a round-robin order, where processing includes sending the outbound messages over the physical communication channel.

公开(公告)号：US20190102309A1

公开(公告)日：2019-04-04

申请号：US15720972

申请日：2017-09-29

Applicant: Oracle International Corporation

Inventor： Zuoyu Tao ,  Jia Shi ,  Kothanda Umamageswaran ,  Juan R. Loaiza

IPC: G06F12/0873 ,  G06F12/0871 ,  G06F12/0868 ,  G06F12/02 ,  G06F15/173 ,  G06F17/30

Abstract: Data blocks are cached in a persistent cache (“NV cache”) allocated from as non-volatile RAM (“NVRAM”). The data blocks may be accessed in place in the NV cache of a “source” computing element by another “remote” computing element over a network using remote direct memory access (“RMDA”). In order for a remote computing element to access the data block in NV cache on a source computing element, the remote computing element needs the memory address of the data block within the NV cache. For this purpose, a hash table is stored and maintained in RAM on the source computing element. The hash table identifies the data blocks in the NV cache and specifies a location of the cached data block within the NV cache.

公开(公告)号：US10152412B2

公开(公告)日：2018-12-11

申请号：US14794107

申请日：2015-07-08

Applicant: Oracle International Corporation

Inventor： Selcuk Aya ,  Jia Shi ,  Kothanda Umamageswaran ,  Juan Loaiza

IPC: G06F12/02 ,  G06F12/0804 ,  G06F12/0871

Abstract: Techniques herein are for chaining nonvolatile storage devices to achieve high availability. A method involves a storage server receiving a write request to store data blocks in a first nonvolatile memory device. The storage server comprises a plurality of nonvolatile memory devices that cache data blocks stored on primary storage. The plurality of nonvolatile memory devices comprises the first nonvolatile memory device. The storage server maintains a cache index of data blocks that reside in the plurality of nonvolatile memory devices. Based on one or more criteria, the storage server reroutes the write request to a second nonvolatile memory device of the plurality of nonvolatile memory devices and stores an identifier of the second nonvolatile memory device in the cache index.

公开(公告)号：US10042781B2

公开(公告)日：2018-08-07

申请号：US15268524

申请日：2016-09-16

Applicant: Oracle International Corporation

Inventor： Roger D. MacNicol ,  Tirthankar Lahiri ,  Kothanda Umamageswaran ,  Adrian Tsz Him Ng ,  Laura Liaoruo Wang ,  Krishnan Meiyyappan

IPC: G06F17/30 ,  G06F12/14 ,  H04L9/06

Abstract: Techniques are described herein for generating and using in-memory data structures to represent columns in data block sets. In an embodiment, a database management system (DBMS) receives a query for a target data set managed by the DBMS. The query may specify a predicate for a column of the target data set. The predicate may include a filtering value to be compared with row values of the column of the target data set. Prior to accessing data block sets storing the target data set from persistent storage, the DBMS identifies an in-memory summary that corresponds to a data block set, in an embodiment. The in-memory summary may include in-memory data structures, each representing a column stored in the data block set. The DBMS determines that a particular in-memory data structure exists in the in-memory summary that represents a portion of values of the column indicated in the predicate of the query. Based on the particular in-memory data structure, the DBMS determines whether or not the data block set can possibly contain the filtering value in the column of the target data set. Based on this determination, the DBMS skips or retrieves the data block set from the persistent storage as part of the query evaluation.

公开(公告)号：US20170206199A1

公开(公告)日：2017-07-20

申请号：US15410496

申请日：2017-01-19

Applicant: Oracle International Corporation

Inventor： Kothanda Umamageswaran ,  Krishnan Meiyyappan ,  Adrian Tsz Him Ng ,  Vijay Sridharan ,  Wei Zhang ,  Ke Hu ,  Xin Zeng

IPC: G06F17/30 ,  G06F3/06

CPC classification number: G06F16/24552 ,  G06F16/27

Abstract: According to embodiments, a derived cache that is derived from a first instance of particular data is used to speed up queries and other operations over a second instance of the particular data. Traditionally, a DBMS generates and uses derived cache data only for the database data from which the derived data was derived. However, according to embodiments, derived cache data associated with a first instance of database data is relocated to the location of a second, newly created, instance of the database data. Since the derived cache data is derived from an identical copy of the database data, the cache data derived for the first instance can successfully be used to speed up applications running over the second instance of the database data.

公开(公告)号：US09405694B2

公开(公告)日：2016-08-02

申请号：US14487358

申请日：2014-09-16

Applicant: Oracle International Corporation

Inventor： Kiran Badrinarain Goyal ,  Neil J. S. Macnaughton ,  Eugene Ho ,  Adam Y. Lee ,  Vipin Gokhale ,  Wei-Ming Hu ,  Juan R. Loaiza ,  Kothanda Umamageswaran ,  Bharat C. V. Baddepudi ,  Boris Erlikhman ,  Alexander Tsukerman ,  Selcuk Aya ,  Roger Hansen ,  Adrian Ng

IPC: G06F12/08 ,  G06F17/30

CPC classification number: G06F12/0866 ,  G06F12/084 ,  G06F12/0888 ,  G06F12/0897 ,  G06F17/30312 ,  G06F17/3048 ,  G06F2212/283 ,  G06F2212/311 ,  G06F2212/312 ,  G06F2212/465

Abstract: Techniques are provided for using an intermediate cache between the shared cache of an application and the non-volatile storage of a storage system. The application may be any type of application that uses a storage system to persistently store data. The intermediate cache may be local to the machine upon which the application is executing, or may be implemented within the storage system. In one embodiment where the application is a database server, the database system includes both a DB server-side intermediate cache, and a storage-side intermediate cache. The caching policies used to populate the intermediate cache are intelligent, taking into account factors that may include which object an item belongs to, the item type of the item, a characteristic of the item, or the type of operation in which the item is involved.

Abstract translation: 提供了在应用的共享缓存和存储系统的非易失性存储之间使用中间缓存的技术。 应用程序可以是使用存储系统持久存储数据的任何类型的应用程序。 中间缓存可以是应用程序正在执行的机器本地，也可以在存储系统内实现。 在应用程序是数据库服务器的一个实施例中，数据库系统包括DB服务器侧中间缓存和存储侧中间缓存。 用于填充中间缓存的缓存策略是智能的，考虑到可能包括项目属于哪个对象，项目的项目类型，项目的特征或涉及项目的操作类型的因素 。

公开(公告)号：US20150089138A1

公开(公告)日：2015-03-26

申请号：US14336860

申请日：2014-07-21

Applicant: Oracle International Corporation

Inventor： Zuoyu Tao ,  Jia Shi ,  Kothanda Umamageswaran ,  Selcuk Aya

IPC: G06F12/08

CPC classification number: G06F12/0893 ,  G06F3/06 ,  G06F3/0611 ,  G06F3/0632 ,  G06F3/0643 ,  G06F3/0685 ,  G06F12/0246 ,  G06F12/0804 ,  G06F12/0806 ,  G06F12/0866 ,  G06F17/30115 ,  G06F2212/1008 ,  G06F2212/1024 ,  G06F2212/225 ,  G06F2212/46 ,  G06F2212/604 ,  G06F2212/608 ,  G06F2212/7207 ,  G06F2212/7208

Abstract: A method and system for fast file initialization is provided. An initialization request to create or extend a file is received. The initialization request comprises or identifies file template metadata. A set of allocation units are allocated, the set of allocation units comprising at least one allocation unit for the file on a primary storage medium without initializing at least a portion of the file on the primary storage medium. The file template metadata is stored in a cache. The cache resides in at least one of volatile memory and persistent flash storage. A second request is received corresponding to a particular allocation unit of the set of allocation units. Particular file template metadata associated with the particular allocation unit is obtained. In response to the second request, at least a portion of a new allocation unit is generated.

Abstract translation: 提供了一种用于快速文件初始化的方法和系统。 接收到创建或扩展文件的初始化请求。 初始化请求包括或识别文件模板元数据。 分配一组分配单元，该组分配单元包括在主存储介质上的文件的至少一个分配单元，而不在该主存储介质上初始化文件的至少一部分。 文件模板元数据存储在缓存中。 缓存位于易失性存储器和持久闪存存储器中的至少一个中。 接收对应于该组分配单元的特定分配单元的第二请求。 获得与特定分配单元相关联的特定文件模板元数据。 响应于第二请求，生成新的分配单元的至少一部分。

公开(公告)号：US20150089008A1

公开(公告)日：2015-03-26

申请号：US14488161

申请日：2014-09-16

Applicant: Oracle International Corporation

Inventor： Vijay Sridharan ,  Richard Frank ,  Jia Shi ,  Kothanda Umamageswaran ,  Juan Loaiza ,  Alexander Tsukerman ,  Bang Nguyen ,  Sumanta Chatterjee

IPC: H04L12/851

CPC classification number: H04L47/24 ,  H04L47/2433 ,  H04L47/2441 ,  H04L67/322

Abstract: A method and apparatus for intelligent network resource manager for distributed computing systems is provided. A first priority is assigned to a first virtual channel set that includes at least two virtual channels of a plurality of virtual channels associated with a physical communication channel. A second priority is assigned to a second virtual channel set that includes at least one virtual channel of the plurality of virtual channels. The first virtual channel set has more virtual channels than the second virtual channel set. Outbound messages of the first priority are directed to virtual channels of the first virtual channel set. Outbound messages of the second priority are directed to virtual channels of the second virtual channel set. The virtual channels are processed in a round-robin order, where processing includes sending the outbound messages over the physical communication channel.

Abstract translation: 提供了一种用于分布式计算系统的智能网络资源管理器的方法和装置。 第一优先级被分配给包括与物理通信信道相关联的多个虚拟信道中的至少两个虚拟信道的第一虚拟信道集合。 第二优先级被分配给包括多个虚拟信道中的至少一个虚拟信道的第二虚拟信道集合。 第一个虚拟通道组具有比第二个虚拟通道组更多的虚拟通道。 第一优先级的出站消息被引导到第一虚拟信道集合的虚拟信道。 第二优先级的出站消息被引导到第二虚拟信道集合的虚拟信道。 以循环顺序处理虚拟信道，其中处理包括通过物理通信信道发送出站消息。

公开(公告)号：US20150088880A1

公开(公告)日：2015-03-26

申请号：US14313984

申请日：2014-06-24

Applicant: Oracle International Corporation

Inventor： Umesh Panchaksharaiah ,  Krishnan Meiyyappan ,  Kothanda Umamageswaran ,  Alex Tsukerman ,  Semen Ustimenko ,  Adrian Ng ,  Devang Mundhra ,  Yinian Qi

IPC: G06F17/30

CPC classification number: G06F17/30339 ,  G06F17/30289

Abstract: Techniques are described herein for supporting multiple versions of a database server within a database machine comprising a separate database layer and storage layer. In an embodiment, the database layer includes compute nodes each hosting one or more instances of a database server. The storage layer includes storage nodes each hosting one or more instances of a storage server, also referred to herein as a “cell server.” In general, the database servers may receive data requests, such as SQL queries, from client applications and service the requests in coordination with the cell servers of the storage layer.

Abstract translation: 这里描述了用于支持数据库机器中的多个版本的技术，该数据库机器包括单独的数据库层和存储层。 在一个实施例中，数据库层包括每个托管数据库服务器的一个或多个实例的计算节点。 存储层包括每个托管存储服务器的一个或多个实例的存储节点，在本文中也称为“小区服务器”。通常，数据库服务器可以从客户端应用接收诸如SQL查询的数据请求，并且服务于 请求与存储层的单元服务器协调。