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    Server-side extension of client-side caches
    1.
    发明授权
    Server-side extension of client-side caches 有权

    公开(公告)号：US11327887B2

    公开(公告)日：2022-05-10

    申请号：US15705166

    申请日：2017-09-14

    Applicant: Oracle International Corporation

    Inventor： Jia Shi ,  Wei Zhang ,  Kothanda Umamageswaran ,  Neil J. S. MacNaughton ,  Vijayakrishnan Nagarajan

    IPC: G06F15/167 ,  G06F12/0808 ,  G06F13/28 ,  G06F16/10 ,  G06F16/172

    Abstract: Techniques related to a server-side extension of client-side caches are provided. A storage server computer receives, from a database server computer, an eviction notification indicating that a data block has been evicted from the database server computer's cache. The storage server computer comprises a memory hierarchy including a volatile cache and a persistent cache. Upon receiving the eviction notification, the storage server computer retrieves the data block from the persistent cache and stores it in the volatile cache. When the storage server computer receives, from the database server computer, a request for the data block, the storage server computer retrieves the data block from the volatile cache. Furthermore, the storage server computer sends the data block to the database server computer, thereby causing the data block to be stored in the database server computer's cache. Still further, the storage server computer evicts the data block from the volatile cache.

    Database snapshots
    2.
    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.

    Detection of avoidable cache thrashing for OLTP and DW workloads
    9.
    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.

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