公开(公告)号：US20170109295A1

公开(公告)日：2017-04-20

申请号：US14887578

申请日：2015-10-20

Applicant: SAP SE

Inventor： Johan LASPERAS ,  Ismail Oukid ,  Anisoara Nica

IPC: G06F12/14 ,  H04L29/06

CPC classification number: G06F12/1408 ,  G06F17/30949 ,  G06F2212/1052 ,  H04L63/061 ,  H04L63/0876

Abstract: Disclosed herein are system, method, and computer program product embodiments for accessing and managing storage class memory (SCM) enabled main-memory database structures. An embodiment operates by traversing a first node to find a location of a second node corresponding to a search key, calculating a hash value for the search key, comparing the calculated hash value with at least one fingerprint value stored in the second node, wherein the fingerprint value is determined by hashing a stored key, accessing at least one key-value pair having a matching hash value, and returning a value associated with the matching key-value pair, wherein at least one of the traversing, calculating, comparing, accessing, and returning are performed by one or more computers.

公开(公告)号：US20160371162A1

公开(公告)日：2016-12-22

申请号：US14973447

申请日：2015-12-17

Applicant: SAP SE

Inventor： Daniel Booss ,  Ivan Schreter ,  Ismail Oukid ,  Adrien Lespinasse

IPC: G06F11/20 ,  G06F3/06

CPC classification number: G06F11/2094 ,  G06F11/00 ,  G06F2201/805

Abstract: Disclosed herein are innovations in memory management and data recovery for systems that operate using storage class memory (SCM), such as non-volatile RAM (NVRAM). The disclosed innovations have particular application to production database systems, where reducing database downtime in the event of a system crash is highly desirable. Embodiments of the disclosed technology can address a variety of problems that exist during a system crash. For example, embodiments of the disclosed technology can be used to address the loss of the physical memory mapping and/or the loss of the CPU cache that typically occurs in the event of a system crash. Furthermore, embodiments of the disclosed technology can be used to prevent data inconsistency and/or memory leak problems that may arise in the event of a system crash.

Abstract translation: 这里公开了对使用诸如非易失性RAM（NVRAM）的存储类存储器（SCM）进行操作的系统的存储器管理和数据恢复的创新。 所公开的创新特别适用于生产数据库系统，其中在系统崩溃的情况下减少数据库停机时间是非常需要的。 所公开的技术的实施例可以解决系统崩溃期间存在的各种问题。 例如，所公开的技术的实施例可以用于解决通常在系统崩溃的情况下发生的物理存储器映射的丢失和/或CPU高速缓存的丢失。 此外，所公开的技术的实施例可以用于防止在系统崩溃的情况下可能出现的数据不一致和/或内存泄漏问题。