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      <h1 class="index-header">
        
        <a href="/2021/06/22/placementOfColumnStore/">Workload-Driven Placement of Column-Store Data Structures on DRAM and NVM</a>
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        <a href="/2021/06/22/placementOfColumnStore/">
          
          
          DaMoN 2021 原文链接
abstract
研究列存储数据结构在 DRAM 和 NVM 的混合层次结构中的放置，目的是在不影响性能的情况下将尽可能多的数据放置在 NVM 中

提出一种启发式方法，利用轻量级访问计数器来建议哪些结构应该放在 DRAM 中，哪些应该放在 NVM 中

使用 TPC-H 的评估表明，超过 80% 的查询所接触的数据可以放在 NVM 中，几乎没有减速，而naivel
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            <time datetime="2021-06-22 18:26" pubdate>
              2021-06-22
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              <a href="/tags/paper-reading/">paper reading</a>
            
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        <a href="/2021/05/07/cstore/">C-store</a>
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        <a href="/2021/05/07/cstore/">
          
          
          A Column-oriented DBMSabstractintroduction优化更新和优化读的数据结构之间存在矛盾。比如，当数据是按条目到达顺序存储时，可以在列的末尾以批处理或事务方式有效地插入新数据项。但是，这样读的代价会比较大。然而，以非数据到达顺序存储将使插入的代价昂贵。
C-Store从一个全新的角度解决了这个难题。将一个read-optimized的列存储和一个面向更新/插入的w
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            <time datetime="2021-05-07 21:18" pubdate>
              2021-05-07
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              <a href="/tags/paper-reading/">paper reading</a>
            
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        <a href="/2021/05/07/x-engine/">X-engine</a>
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        <a href="/2021/05/07/x-engine/">
          
          
          X-engineabstractintroduction网上电子商务交易有三个显著特征

The tsunami problem
从11月11日00:00:00开始，底层存储引擎的事务工作负载(反映为每秒事务与时间的垂直峰值)急剧增加，就像一场巨大的海啸袭击了海岸。


The flood discharge problem
存储引擎必须能够在处理高并发电子商务的同时，将数据从主存快速移动到持
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              2021-05-07
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              <a href="/tags/paper-reading/">paper reading</a>
            
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        <a href="/2021/03/08/spitfire/">Spitfire</a>
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        <a href="/2021/03/08/spitfire/">
          
          
          Spitfire: A Three-Tier Buffer Manager for Volatile and Non-Volatile Memoryabstractbuffer manager设计的关键假设就是数据必须从non-volatile storage迁移到DRAM, 才能对数据进行操作，而且storage速度比DRAM慢几个数量级。但是新的非易失性存储器(NVM)技术的到来,使这些先前的
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              2021-03-08
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        <a href="/2021/03/03/clickhouse_in_memory_format/">ClickHouse in memory part和wal分析</a>
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        <a href="/2021/03/03/clickhouse_in_memory_format/">
          
          
          相关PRhttps://github.com/ClickHouse/ClickHouse/pull/10697
使用在MergeTree中添加了part的in memory format，数据存储在内存中。 part在第一次合并时写入磁盘。 如果零件的行或字节大小小于阈值min_rows_for_compact_part和min_bytes_for_compact_part，则将以内存格式创建pa
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            <time datetime="2021-03-03 13:31" pubdate>
              2021-03-03
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              <a href="/tags/ClickHouse/">ClickHouse</a>
            
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        <a href="/2021/01/26/clickhouse_principle/">ClickHouse解析</a>
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        <a href="/2021/01/26/clickhouse_principle/">
          
          
          clickhouse简介“When we released ClickHouse, we had only one goal in mind, to give people the fastest analytical DBMS in the world.”                                                                 — Alex
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            <time datetime="2021-01-26 22:08" pubdate>
              2021-01-26
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        <a href="/2020/12/25/%E6%8B%89%E6%9B%BC%E6%9F%A5%E9%85%BF%E5%BF%83%E4%BA%BA/">拉曼查酿心人剧评</a>
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        <a href="/2020/12/25/%E6%8B%89%E6%9B%BC%E6%9F%A5%E9%85%BF%E5%BF%83%E4%BA%BA/">
          
          
第一次去看这种环境话剧,一开始还很期待环境话剧的演出形式.  不像是观众在台下,演员在台上的那种传统演出形式.  演员和观众有了更多的互动, 观众也随着演出的转场而移步换景, 好像剧中的故事真的就发生在自己周围, 沉浸感十足.
拉曼查是西班牙的葡萄酒产区,故事也主要发生在这个地方. 辛雨追寻男朋友路涛的脚步来到了西班牙,然而却和路涛产生了矛盾. 后来房东姐姐过来安慰辛雨,并帮她安排了在拉曼查采摘
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            <time datetime="2020-12-25 22:49" pubdate>
              2020-12-25
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              <a href="/tags/%E6%88%8F%E5%89%A7/">戏剧</a>
            
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        <a href="/2020/12/24/LaTeX%E5%B8%B8%E7%94%A8%E5%91%BD%E4%BB%A4(3)/">LaTeX常用命令(3)</a>
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        <a href="/2020/12/24/LaTeX%E5%B8%B8%E7%94%A8%E5%91%BD%E4%BB%A4(3)/">
          
          
          这次主要写一些数学相关的东西.

在LaTeX中最常用到的就是文本模式和数学模式.数学模式又分为行内公式和行间公式两种.
简单来说,行内公式就是将数学式子写在文本行中,与文本融为一体,适用于比较简单的式子,比如说:  .
而行间公式是将数学式插在文本行之间,自成一行.适用于较复杂的式子.
行内公式的三种形式

$…….$
(…….)
\begin{math}……..\end{math}

排版效果
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            <time datetime="2020-12-24 13:49" pubdate>
              2020-12-24
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              <a href="/tags/LaTeX/">LaTeX</a>
            
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      <h1 class="index-header">
        
        <a href="/2020/12/24/LaTeX%E5%B8%B8%E7%94%A8%E5%91%BD%E4%BB%A4(2)/">LaTeX常用命令(2)</a>
      </h1>

      <p class="index-excerpt">
        <a href="/2020/12/24/LaTeX%E5%B8%B8%E7%94%A8%E5%91%BD%E4%BB%A4(2)/">
          
          
          这是第二篇,主要写一下表格,列表,图的内容,还有上次没写到的参考文献.

表格LaTeX提供了无表格框线环境tabbing和有表格框线的tabular,tabular*,array,其中array是用于数学模式的表格环境.
就我个人而言,主要使用tabular,array这两种表格环境.
先来介绍tabular
tabular的命令结构如下:
123\begin&#123;tabular&#125
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            <time datetime="2020-12-24 13:46" pubdate>
              2020-12-24
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              <a href="/tags/LaTeX/">LaTeX</a>
            
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      <h1 class="index-header">
        
        <a href="/2020/12/23/LaTeX%E5%B8%B8%E7%94%A8%E5%91%BD%E4%BB%A4(1)/">LaTeX常用命令(1)</a>
      </h1>

      <p class="index-excerpt">
        <a href="/2020/12/23/LaTeX%E5%B8%B8%E7%94%A8%E5%91%BD%E4%BB%A4(1)/">
          
          
          这一篇主要记录自己常用的一些LaTeX的操作,包括常用的一些格式,下一节LaTeX文章主要为数学公式及图表的内容.
文档类型一般来说,我们写TeX文档时,第一句命令就是文档类型的命令.
文档类型主要有 article,report,book,beamer,还有用于中文排版的ctexart,ctexrep,ctexbook分别对应article,report,book.用于排版中文的文类可以不用再调
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              2020-12-23
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              <a href="/tags/LaTeX/">LaTeX</a>
            
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