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    Adaptive caching for hybrid columnar databases with heterogeneous page sizes
    1.
    发明授权
    Adaptive caching for hybrid columnar databases with heterogeneous page sizes 有权

    公开(公告)号：US12153816B2

    公开(公告)日：2024-11-26

    申请号：US17944610

    申请日：2022-09-14

    Applicant: SAP SE

    Inventor： Prateek Agarwal ,  Simhachala Sasikanth Gottapu ,  Sarika Iyer ,  Prasanta Ghosh ,  Colin Florendo

    IPC: G06F3/06

    Abstract: Disclosed herein are system, method, and computer program product embodiments for adaptive caching for hybrid columnar databases with heterogeneous page sizes. An embodiment operates by scanning one or more pools comprising one or more pages of the same size in a buffer cache. The embodiment determines an increment of a reuse rate for the pools in the buffer cache within a time interval. The embodiment determines a cumulative reuse rate that is the sum of the increments of the reuse rate over several time intervals. The embodiment determines a gliding average reuse rate of the cumulative reuse rate over several time intervals. The embodiment compares the average reuse rates of the plurality of the pools to a threshold to dynamically determine whether a pool should reuse memory from the existing pages of the same pool or rebalance memory from one or more victim pools.

    ADAPTIVE CACHING FOR HYBRID COLUMNAR DATABASE WITH HETEROGENEOUS PAGE SIZES
    2.
    发明申请
    ADAPTIVE CACHING FOR HYBRID COLUMNAR DATABASE WITH HETEROGENEOUS PAGE SIZES 有权

    公开(公告)号：US20230011790A1

    公开(公告)日：2023-01-12

    申请号：US17944610

    申请日：2022-09-14

    Applicant: SAP SE

    Inventor： PRATEEK AGARWAL ,  Simhachala Sasikanth Gottapu ,  Sarika Iyer ,  Prasanta Ghosh ,  Colin Florendo

    IPC: G06F3/06

    Abstract: Disclosed herein are system, method, and computer program product embodiments for adaptive caching for hybrid columnar databases with heterogeneous page sizes. An embodiment operates by scanning one or more pools comprising one or more pages of the same size in a buffer cache. The embodiment determines an increment of a reuse rate for the pools in the buffer cache within a time interval. The embodiment determines a cumulative reuse rate that is the sum of the increments of the reuse rate over several time intervals. The embodiment determines a gliding average reuse rate of the cumulative reuse rate over several time intervals. The embodiment compares the average reuse rates of the plurality of the pools to a threshold to dynamically determine whether a pool should reuse memory from the existing pages of the same pool or rebalance memory from one or more victim pools.

    Adaptive caching for hybrid columnar databases with heterogeneous page sizes
    4.
    发明授权
    Adaptive caching for hybrid columnar databases with heterogeneous page sizes 有权

    公开(公告)号：US11481134B1

    公开(公告)日：2022-10-25

    申请号：US17328656

    申请日：2021-05-24

    Applicant: SAP SE

    Inventor： Prateek Agarwal ,  Simhachala Sasikanth Gottapu ,  Sarika Iyer ,  Prasanta Ghosh ,  Colin Florendo

    IPC: G06F3/06

    Abstract: Disclosed herein are system, method, and computer program product embodiments for adaptive caching for hybrid columnar databases with heterogeneous page sizes. An embodiment operates by receiving a request to load a new page of memory from a disk in a buffer cache. The embodiment scans one or more pools comprising one or more pages of the same size in a buffer cache. The embodiment determines an increment of a reuse rate for the pools in the buffer cache within a time interval. The embodiment determines a cumulative reuse rate that is the sum of the increments of the reuse rate over several time intervals. The embodiment determines a gliding average reuse rate of the cumulative reuse rate over several time intervals. The embodiment compares the average reuse rates of the plurality of the pools to a threshold to dynamically determine whether a pool should reuse memory from the existing pages of the same pool or rebalance memory from one or more victim pools.

    Fair prefetching in hybrid column stores
    6.
    发明授权
    Fair prefetching in hybrid column stores 有权

    公开(公告)号：US11442862B2

    公开(公告)日：2022-09-13

    申请号：US16850310

    申请日：2020-04-16

    Applicant: SAP SE

    Inventor： Robert Schulze ,  Adrian Dragusanu ,  Anup Ghatage ,  Colin Florendo ,  Mihnea Andrei ,  Randall Hammon ,  Sarika Iyer ,  Simhachala Sasikanth Gottapu ,  Yanhong Wang

    IPC: G06F12/08 ,  G06F12/0862 ,  G06F12/0882 ,  G06F16/24 ,  G06F16/22

    Abstract: Disclosed herein are system, method, and computer program product embodiments for performing fair prefetching. An embodiment operates by splitting a data vector into a first subrange and a second subrange. The embodiment performs a first chance prefetch operation on the first subrange based on a fixed number of pages, thereby loading a set of pages of the first subrange into a main memory. The embodiment performs the first chance prefetch operation on the second subrange based on the fixed number of pages, thereby loading a first set of pages of the second subrange into the main memory. The embodiment performs a second chance prefetch operation on the second subrange based on the performing the first chance prefetch operation on the second subrange, thereby loading a second set of pages of the second subrange into the main memory. The embodiment then executes the query.

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