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    Database snapshots
    1.
    发明授权
    Database snapshots 有权

    公开(公告)号：US10387447B2

    公开(公告)日：2019-08-20

    申请号：US14823212

    申请日：2015-08-11

    Applicant: Oracle International Corporation

    Inventor： Nilesh Choudhury ,  Scott Martin ,  Zuoyu Tao ,  Jia Shi ,  Alexander Tsukerman ,  Kothanda Umamageswaran

    IPC: G06F16/27 ,  G06F11/14 ,  G06F3/06

    Abstract: Techniques herein are for creating a database snapshot by creating a sparse database. A method involves receiving a creation request to create a sparse database. The creation request has an identity of a parent database. The creation request is processed to create a sparse database. The sparse database has the identity of the parent database. The sparse database does not contain data copied from the parent database. A write request to write data into the sparse database is received. The write request is processed by writing the data into the sparse database. The parent database does not receive the data.

    PMEM CACHE RDMA SECURITY
    3.
    发明申请
    PMEM CACHE RDMA SECURITY 有权

    公开(公告)号：US20210303154A1

    公开(公告)日：2021-09-30

    申请号：US16831337

    申请日：2020-03-26

    Applicant: Oracle International Corporation

    Inventor： Wei Zhang ,  Jia Shi ,  Zuoyu Tao ,  Kothanda Umamageswaran

    IPC: G06F3/06 ,  G06F9/38 ,  G06F12/1081 ,  G06F16/906

    Abstract: Techniques are described for providing one or more clients with direct access to cached data blocks within a persistent memory cache on a storage server. In an embodiment, a storage server maintains a persistent memory cache comprising a plurality of cache lines, each of which represent an allocation unit of block-based storage. The storage server maintains an RDMA table that include a plurality of table entries, each of which maps a respective client to one or more cache lines and a remote access key. An RDMA access request to access a particular cache line is received from a storage server client. The storage server identifies access credentials for the client and determines whether the client has permission to perform the RDMA access on the particular cache line. Upon determining that the client has permissions, the cache line is accessed from the persistent memory cache and sent to the storage server client.

    NV CACHE
    4.
    发明申请
    NV CACHE 审中-公开

    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.

    Fast Data Initialization
    5.
    发明申请
    Fast Data Initialization 有权
    快速数据初始化

    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。

    Detection of avoidable cache thrashing for OLTP and DW workloads
    6.
    发明授权
    Detection of avoidable cache thrashing for OLTP and DW workloads 有权

    公开(公告)号：US11138131B2

    公开(公告)日：2021-10-05

    申请号：US16388955

    申请日：2019-04-19

    Applicant: Oracle International Corporation

    Inventor： Justin Matthew Lewis ,  Zuoyu Tao ,  Jia Shi ,  Kothanda Umamageswaran

    IPC: G06F12/00 ,  G06F12/121 ,  G06F12/0891

    Abstract: Techniques are provided to adjust the behavior of a cache based on a count of cache misses for items recently evicted. In an embodiment, a computer responds to evicting a particular item (PI) from a cache by storing a metadata entry for the PI into memory. In response to a cache miss for the PI, the computer detects whether or not the metadata entry for the PI resides in memory. When the metadata entry for the PI is detected in memory, the computer increments a victim hit counter (VHC) that may be used to calculate how much avoidable thrashing is the cache experiencing, which is how much thrashing would be reduced if the cache were expanded. Either immediately or arbitrarily later, the computer adjusts a policy of the cache based on the VHC's value. For example, the computer may adjust the capacity of the cache based on the VHC.

    Rapid Recovery From Downtime Of Mirrored Storage Device
    8.
    发明申请
    Rapid Recovery From Downtime Of Mirrored Storage Device 审中-公开
    镜像存储设备停机时间快速恢复

    公开(公告)号：US20140281272A1

    公开(公告)日：2014-09-18

    申请号：US13801319

    申请日：2013-03-13

    Applicant: ORACLE INTERNATIONAL CORPORATION

    Inventor： Juan R. Loaiza ,  Kothanda Umamageswaran ,  David Friedman ,  Jia Shi ,  Zuoyu Tao ,  Alex Tsukerman

    IPC: G06F12/08

    CPC classification number: G06F12/0868 ,  G06F11/2058 ,  G06F11/2082 ,  G06F12/0804 ,  G06F12/12 ,  G06F2212/222 ,  G06F2212/262 ,  G06F2212/286

    Abstract: No-loss rapid recovery performs resynchronization efficiently while concurrently allowing availability to mirrored data on the storage device. No-loss rapid recovery has two stages and involves storage devices that have both a non-volatile cache and primary storage and that operate as mirror buddies. The first stage is referred to herein as the buddy-retention stage. During the buddy-retention stage, writes to mirrored data are not performed on the offline mirror buddy but are performed on the online mirror buddy. The mirrored data changed in the online mirrored buddy is retained in the non-volatile cache of the retention buddy. The next stage is referred to herein as the rapid resynchronization stage. In this stage, the changed mirrored data retained by the retention buddy for no-loss rapid recovery is used to resynchronize the offline buddy. The storage device is resynchronized using the changed mirrored data retained in the cache of the mirror buddy.

    Abstract translation: 无损失快速恢复有效地执行重新同步，同时允许可用性在存储设备上镜像数据。 无损快速恢复有两个阶段，涉及具有非易失性缓存和主存储并且作为镜像伙伴操作的存储设备。 第一阶段在本文中称为保留阶段。 在好友保留期间，对镜像数据的写入不会在离线镜像伙伴上执行，而是在在线镜像伙伴上执行。 在线镜像伙伴中更改的镜像数据保留在保留伙伴的非易失性缓存中。 下一阶段在本文中被称为快速再同步化阶段。 在这个阶段，由保留伙伴保留的无损失快速恢复所更改的镜像数据用于重新同步脱机伙伴。 使用保留在镜像伙伴缓存中的已更改的镜像数据重新同步存储设备。

    Non-volatile cache access using RDMA
    9.
    发明授权
    Non-volatile cache access using RDMA 有权

    公开(公告)号：US10956335B2

    公开(公告)日：2021-03-23

    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 ,  G06F12/0864 ,  G06F16/22 ,  G06F16/2455 ,  G06F12/02 ,  G06F12/0868 ,  G06F12/0871 ,  G06F15/173

    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.

    Rapid recovery from downtime of mirrored storage device
    10.
    发明授权
    Rapid recovery from downtime of mirrored storage device 有权

    公开(公告)号：US10380021B2

    公开(公告)日：2019-08-13

    申请号：US13801319

    申请日：2013-03-13

    Applicant: Oracle International Corporation

    Inventor： Juan R. Loaiza ,  Kothanda Umamageswaran ,  David Friedman ,  Jia Shi ,  Zuoyu Tao ,  Alex Tsukerman

    IPC: G06F12/0868 ,  G06F12/0804 ,  G06F11/20 ,  G06F12/12

    Abstract: No-loss rapid recovery performs resynchronization efficiently while concurrently allowing availability to mirrored data on the storage device. No-loss rapid recovery has two stages and involves storage devices that have both a non-volatile cache and primary storage and that operate as mirror buddies. The first stage is referred to herein as the buddy-retention stage. During the buddy-retention stage, writes to mirrored data are not performed on the offline mirror buddy but are performed on the online mirror buddy. The mirrored data changed in the online mirrored buddy is retained in the non-volatile cache of the retention buddy. The next stage is referred to herein as the rapid resynchronization stage. In this stage, the changed mirrored data retained by the retention buddy for no-loss rapid recovery is used to resynchronize the offline buddy. The storage device is resynchronized using the changed mirrored data retained in the cache of the mirror buddy.

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