文件名称:
Concurrency in Main-Memory Database Systems
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文件大小: 1mb
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上传时间: 2018-08-04
详细说明： availability of powerful servers with terabytes of main-memory has sparked a renewed interest in main-memory database systems. Many early proposals focus on a single workload type, either short transactions or long-running, read-only analytical queries. In this thesis, we focus on allowing a broad range of workloads to be executed concurrently on the same state of the data. While concurrency control is generally wellresearched, we determine the merit of traditional solutions in a main-memory context and suggest solutions which a re ideally suited to the changed environment. In the first part of this thesis, the optimal mechanism for creating snapshot in main-memory database systems is determined which can then be used to execute transactions and analytic queries by running queries on a fresh, transaction-consistent snapshot. Second, we introduce tentative execution, a mechanism which allows long-running transactions to be efficiently executed side by side with short transactions and read-only analytical queries. Third, we describe how low-footprint main-memory database systems allow for low overhead multi-tenancy while leveraging existing operating system mechanisms to enforce service level agreements. ...展开收缩
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