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ThinkMind // DBKDA 2013, The Fifth International Conference on Advances in Databases, Knowledge, and Data Applications // View article dbkda_2013_5_20_30027
Aspects of Append-Based Database Storage Management on Flash Memories
 Authors:
Robert Gottstein
Ilia Petrov
Alejandro Buchmann Keywords: Multi Version Concurrency Control; Snapshot Isolation; Version; Append Storage; Flash; Data Placement Abstract:
New storage technologies, such as Flash and Non-Volatile Memories, with fundamentally different properties are appearing. Leveraging their performance and endurance requires a redesign of existing architecture and algorithms in modern high performance databases. Multi-Version Concurrency Control (MVCC) approaches in database systems, maintain multiple timestamped versions of a tuple. Once a transaction reads a tuple the database system tracks and returns the respective version eliminating lock-requests. Hence under MVCC reads are never blocked, which leverages well the excellent read performance (high throughput, low latency) of new storage technologies. Upon tuple updates, however, established implementations of MVCC approaches (such as Snapshot Isolation) lead to multiple random writes - caused by (i) creation of the new and (ii) in-place invalidation of the old version - thus generating suboptimal access patterns for the new storage media. The combination of an append based storage manager operating with tuple granularity and snapshot isolation addresses asymmetry and in-place updates. In this paper, we highlight novel aspects of log-based storage, in multi-version database systems on new storage media. We claim that multi-versioning and append-based storage can be used to effectively address asymmetry and endurance. We identify multi-versioning as the approach to address data-placement in complex memory hierarchies. We focus on: version handling, (physical) version placement, compression and collocation of tuple versions on Flash storage and in complex memory hierarchies. We identify possible read- and cache-related optimizations. Pages: 116 to 120 Copyright: Copyright (c) IARIA, 2013 Publication date: January 27, 2013 Published in: conference ISSN: 2308-4332 ISBN: 978-1-61208-247-9 Location: Seville, Spain Dates: from January 27, 2013 to February 1, 2013
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