This tutorial provides an overview of recent developments in mainmemory database systems. With growing memory sizes and memory prices dropping by a factor of 10 every 5 years, data having a "primary home" in memory is now a reality. Main-memory databases eschew many of the traditional ...
3.1.3FeaturesofMainMemoryDatabases Themainmemorydatabasehasmanyexcellentfeatures,andsomeimportantonesarelistedasfollows:•Highthroughputrateandlowaccessdelay•Excellentparallelprocessingpower•Highhardwaredependencies ConceptCheck •WhatisaMainMemorydatabase?•DescribetheDifferencesbetweenMainMemorydatabaseanddisk...
摘要随着内存价格降低, 将数据库索引全部放入到内存是可行的, 但由于传统的内存索引结构在现代硬件上效率不高 (CPU cache 不友好), 而表现好的内存索引结构, 例如 hash table, 又不支持范围扫描. 该论文提出了一种…
文章定义了两种依赖:incomming Wait-For Dependencies和outgoing wait-for dependencies,前者表示我依赖了谁,后者表示谁依赖了我。为了实现这两种依赖,使用一些数据结构来实现: incomming Wait-For Dependencies WaitForCounter:表示我依赖了多少个其它事务 NoMoreWaitFors:表示是否允许增加依赖,防止饥饿 outgoing wait-for de...
3.2 The Evolution of Main Memory Databases Research of the main memory database began early, and its rudiment arose at the end of 1960s. Since main memory databases had small capacity and high cost, they were mostly used as the secondary storage for embedded ...
其中，B+ Tree 有效减少磁盘 IO 次数，而现代 CPU 支持的 SIMD 技术使 k-ary 和 FAST 数据结构更有效。ART 树通过自适应节点结构、内部节点和叶节点的优化设计，以及支持增量更新的机制，解决了传统基数树在空间利用率和性能上的不足。ART 内部节点使用 4 种不同大小的结构，实现高效查找、添加和...
Concurrency control provides multi-user access to a database system, while ensuring concurrent transactional correctness. Classical RDBMS products such as Oracle, DB2 and SQL Server have Disk Resident databases DRDBs) with designs from the 1970s, whose data can only be read or updated after being...
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Cold data in main-memory databases. The HyPer system is a main-memory hybrid OLTP and OLAP system [2]. HyPer achieves latch-freedom for OLTP workloads by partitioning ta- bles. Partitions are further broken into "chunks" that are stored in a decomposed storage model in "attribute vectors" ...
3.Main Memory Databases(MMDB) During the mid-1980s falling DRAM prices seemed to suggest that future computers would have such huge main memories that most databases could entirely be stored in them[4]. In such situations, it would be possible to eliminate all expensive I/O from DBMS proces...