公开(公告)号：US10558636B2

公开(公告)日：2020-02-11

申请号：US15139963

申请日：2016-04-27

Applicant: SAP SE

Inventor： Zheng-wei She ,  Xu-dong Qian ,  Zhi-ping Xiong

IPC: G06F16/22 ,  G06F16/2452

Abstract: Disclosed herein are system, method, and computer program product embodiments for providing read queries latch-free access to an index page. In an embodiment, a processor receives a request from a read query to access one or more records of an index page. The index page includes an update pointer and a slot array. The processor locates one or more updates prepended to the index page by locating a most recently prepended update indicated by the update pointer. Then, the processor generates a local offset table with entries in the slot array and the located one or more updates. The generated local offset table enables the processor to provide the read query access to the one or more records of the index page.

公开(公告)号：US20210286777A1

公开(公告)日：2021-09-16

申请号：US16816511

申请日：2020-03-12

Applicant: SAP SE

Inventor： PANFENG ZHOU ,  Vivek Kandiyanallur ,  Colin Florendo ,  Robert Schulze ,  Zheng-wei She ,  Yanhong Wang ,  Amarnadh Sai Eluri

IPC: G06F16/21 ,  G06F16/22 ,  G06N5/04

Abstract: System, method, and various embodiments for providing a data access and recommendation system are described herein. An embodiment operates by identifying a column access of one or more data values of a first column of a plurality of columns of a table of a database during a sampling period. A count of how many of the one or more data values are accessed during the column access are recorded. A first counter, corresponding to the first column and stored in a distributed hash table, is incremented by the count. The sampling period is determined to have expired. A load recommendation on how to load data values into the first column based on the first counter is computed. The load recommendation for implementation into the database for one or more subsequent column accesses is provided.