# HG changeset patch # User matac42 # Date 1684197876 -32400 # Node ID 6a8c564e7ab253e7a0b8a312bab547b95871d8ba # Parent 4646c6f3a4c174488208b32d2b57d18e6f6de3eb ... diff -r 4646c6f3a4c1 -r 6a8c564e7ab2 marp-slide/slide.html --- a/marp-slide/slide.html Mon May 15 20:16:50 2023 +0900 +++ b/marp-slide/slide.html Tue May 16 09:44:36 2023 +0900 @@ -11,14 +11,14 @@ 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:is(span,marp-span).align-right{clear:both;display:block;overflow:hidden}div#\:\$p>svg>foreignObject>section :is(span,marp-span).align-right>:is(span,marp-span){display:block;margin:13px 0 0;overflow:hidden;text-align:right}div#\:\$p>svg>foreignObject>section :is(span,marp-span).align-right :is(span,marp-span) img{margin:0;text-align:right}div#\:\$p>svg>foreignObject>section :is(span,marp-span).float-left{display:block;float:left;margin-right:13px;overflow:hidden}div#\:\$p>svg>foreignObject>section :is(span,marp-span).float-left :is(span,marp-span){margin:13px 0 0}div#\:\$p>svg>foreignObject>section :is(span,marp-span).float-right{display:block;float:right;margin-left:13px;overflow:hidden}div#\:\$p>svg>foreignObject>section :is(span,marp-span).float-right>:is(span,marp-span){display:block;margin:13px auto 0;overflow:hidden;text-align:right}div#\:\$p>svg>foreignObject>section code,div#\:\$p>svg>foreignObject>section 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code,div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) tt{word-wrap:normal;background-color:transparent;border:0;display:inline;line-height:inherit;margin:0;max-width:auto;overflow:visible;padding:0}div#\:\$p>svg>foreignObject>section .csv-data td,div#\:\$p>svg>foreignObject>section .csv-data th{font-size:12px;line-height:1;overflow:hidden;padding:5px;text-align:left;white-space:nowrap}div#\:\$p>svg>foreignObject>section .csv-data .blob-num{background:var(--color-canvas-default);border:0;padding:10px 8px 9px;text-align:right}div#\:\$p>svg>foreignObject>section .csv-data tr{border-top:0}div#\:\$p>svg>foreignObject>section .csv-data th{background:var(--color-canvas-subtle);border-top:0;font-weight:var(--base-text-weight-semibold,600)}div#\:\$p>svg>foreignObject>section [data-footnote-ref]:before{content:"["}div#\:\$p>svg>foreignObject>section [data-footnote-ref]:after{content:"]"}div#\:\$p>svg>foreignObject>section .footnotes{border-top:1px solid var(--color-border-default);color:var(--color-fg-muted);font-size:12px}div#\:\$p>svg>foreignObject>section div#\:\$p>svg>foreignObject>section section.footnotes{--marpit-root-font-size:12px}div#\:\$p>svg>foreignObject>section .footnotes ol{padding-left:16px}div#\:\$p>svg>foreignObject>section .footnotes ol ul{display:inline-block;margin-top:16px;padding-left:16px}div#\:\$p>svg>foreignObject>section .footnotes li{position:relative}div#\:\$p>svg>foreignObject>section .footnotes li:target:before{border:2px solid var(--color-accent-emphasis);border-radius:6px;bottom:-8px;content:"";left:-24px;pointer-events:none;position:absolute;right:-8px;top:-8px}div#\:\$p>svg>foreignObject>section .footnotes li:target{color:var(--color-fg-default)}div#\:\$p>svg>foreignObject>section .footnotes .data-footnote-backref g-emoji{font-family:monospace}div#\:\$p>svg>foreignObject>section .pl-c{color:var(--color-prettylights-syntax-comment)}div#\:\$p>svg>foreignObject>section .pl-c1,div#\:\$p>svg>foreignObject>section .pl-s .pl-v{color:var(--color-prettylights-syntax-constant)}div#\:\$p>svg>foreignObject>section .pl-e,div#\:\$p>svg>foreignObject>section .pl-en{color:var(--color-prettylights-syntax-entity)}div#\:\$p>svg>foreignObject>section .pl-s .pl-s1,div#\:\$p>svg>foreignObject>section .pl-smi{color:var(--color-prettylights-syntax-storage-modifier-import)}div#\:\$p>svg>foreignObject>section .pl-ent{color:var(--color-prettylights-syntax-entity-tag)}div#\:\$p>svg>foreignObject>section .pl-k{color:var(--color-prettylights-syntax-keyword)}div#\:\$p>svg>foreignObject>section .pl-pds,div#\:\$p>svg>foreignObject>section .pl-s,div#\:\$p>svg>foreignObject>section .pl-s .pl-pse .pl-s1,div#\:\$p>svg>foreignObject>section .pl-sr,div#\:\$p>svg>foreignObject>section .pl-sr .pl-cce,div#\:\$p>svg>foreignObject>section .pl-sr .pl-sra,div#\:\$p>svg>foreignObject>section .pl-sr .pl-sre{color:var(--color-prettylights-syntax-string)}div#\:\$p>svg>foreignObject>section .pl-smw,div#\:\$p>svg>foreignObject>section .pl-v{color:var(--color-prettylights-syntax-variable)}div#\:\$p>svg>foreignObject>section .pl-bu{color:var(--color-prettylights-syntax-brackethighlighter-unmatched)}div#\:\$p>svg>foreignObject>section .pl-ii{background-color:var(--color-prettylights-syntax-invalid-illegal-bg);color:var(--color-prettylights-syntax-invalid-illegal-text)}div#\:\$p>svg>foreignObject>section .pl-c2{background-color:var(--color-prettylights-syntax-carriage-return-bg);color:var(--color-prettylights-syntax-carriage-return-text)}div#\:\$p>svg>foreignObject>section .pl-sr .pl-cce{color:var(--color-prettylights-syntax-string-regexp);font-weight:700}div#\:\$p>svg>foreignObject>section .pl-ml{color:var(--color-prettylights-syntax-markup-list)}div#\:\$p>svg>foreignObject>section .pl-mh,div#\:\$p>svg>foreignObject>section .pl-mh .pl-en,div#\:\$p>svg>foreignObject>section .pl-ms{color:var(--color-prettylights-syntax-markup-heading);font-weight:700}div#\:\$p>svg>foreignObject>section .pl-mi{color:var(--color-prettylights-syntax-markup-italic);font-style:italic}div#\:\$p>svg>foreignObject>section .pl-mb{color:var(--color-prettylights-syntax-markup-bold);font-weight:700}div#\:\$p>svg>foreignObject>section .pl-md{background-color:var(--color-prettylights-syntax-markup-deleted-bg);color:var(--color-prettylights-syntax-markup-deleted-text)}div#\:\$p>svg>foreignObject>section .pl-mi1{background-color:var(--color-prettylights-syntax-markup-inserted-bg);color:var(--color-prettylights-syntax-markup-inserted-text)}div#\:\$p>svg>foreignObject>section .pl-mc{background-color:var(--color-prettylights-syntax-markup-changed-bg);color:var(--color-prettylights-syntax-markup-changed-text)}div#\:\$p>svg>foreignObject>section .pl-mi2{background-color:var(--color-prettylights-syntax-markup-ignored-bg);color:var(--color-prettylights-syntax-markup-ignored-text)}div#\:\$p>svg>foreignObject>section .pl-mdr{color:var(--color-prettylights-syntax-meta-diff-range);font-weight:700}div#\:\$p>svg>foreignObject>section .pl-ba{color:var(--color-prettylights-syntax-brackethighlighter-angle)}div#\:\$p>svg>foreignObject>section .pl-sg{color:var(--color-prettylights-syntax-sublimelinter-gutter-mark)}div#\:\$p>svg>foreignObject>section .pl-corl{color:var(--color-prettylights-syntax-constant-other-reference-link);text-decoration:underline}div#\:\$p>svg>foreignObject>section g-emoji{display:inline-block;font-family:Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol;font-size:1em;font-style:normal!important;font-weight:var(--base-text-weight-normal,400);line-height:1;min-width:1ch;vertical-align:-.075em}div#\:\$p>svg>foreignObject>section g-emoji img{height:1em;width:1em}div#\:\$p>svg>foreignObject>section .task-list-item{list-style-type:none}div#\:\$p>svg>foreignObject>section .task-list-item label{font-weight:var(--base-text-weight-normal,400)}div#\:\$p>svg>foreignObject>section .task-list-item.enabled label{cursor:pointer}div#\:\$p>svg>foreignObject>section .task-list-item+.task-list-item{margin-top:4px}div#\:\$p>svg>foreignObject>section .task-list-item .handle{display:none}div#\:\$p>svg>foreignObject>section .task-list-item-checkbox{margin:0 .2em .25em -1.4em;vertical-align:middle}div#\:\$p>svg>foreignObject>section .contains-task-list:dir(rtl) .task-list-item-checkbox{margin:0 -1.6em .25em .2em}div#\:\$p>svg>foreignObject>section .contains-task-list{position:relative}div#\:\$p>svg>foreignObject>section .contains-task-list:focus-within .task-list-item-convert-container,div#\:\$p>svg>foreignObject>section .contains-task-list:hover .task-list-item-convert-container{clip:auto;display:block;height:24px;overflow:visible;width:auto}div#\:\$p>svg>foreignObject>section ::-webkit-calendar-picker-indicator{filter:invert(50%)}div#\:\$p>svg>foreignObject>section :is(h1,marp-h1){color:var(--h1-color);font-size:1.6em}div#\:\$p>svg>foreignObject>section :is(h1,marp-h1),div#\:\$p>svg>foreignObject>section :is(h2,marp-h2){border-bottom:none}div#\:\$p>svg>foreignObject>section :is(h2,marp-h2){font-size:1.3em}div#\:\$p>svg>foreignObject>section :is(h3,marp-h3){font-size:1.1em}div#\:\$p>svg>foreignObject>section :is(h4,marp-h4){font-size:1.05em}div#\:\$p>svg>foreignObject>section :is(h5,marp-h5){font-size:1em}div#\:\$p>svg>foreignObject>section :is(h6,marp-h6){font-size:.9em}div#\:\$p>svg>foreignObject>section :is(h1,marp-h1) strong,div#\:\$p>svg>foreignObject>section :is(h2,marp-h2) strong,div#\:\$p>svg>foreignObject>section :is(h3,marp-h3) strong,div#\:\$p>svg>foreignObject>section :is(h4,marp-h4) strong,div#\:\$p>svg>foreignObject>section :is(h5,marp-h5) strong,div#\:\$p>svg>foreignObject>section :is(h6,marp-h6) strong{color:var(--heading-strong-color);font-weight:inherit}div#\:\$p>svg>foreignObject>section :is(h1,marp-h1)::part(auto-scaling),div#\:\$p>svg>foreignObject>section :is(h2,marp-h2)::part(auto-scaling),div#\:\$p>svg>foreignObject>section :is(h3,marp-h3)::part(auto-scaling),div#\:\$p>svg>foreignObject>section :is(h4,marp-h4)::part(auto-scaling),div#\:\$p>svg>foreignObject>section :is(h5,marp-h5)::part(auto-scaling),div#\:\$p>svg>foreignObject>section :is(h6,marp-h6)::part(auto-scaling){max-height:563px}div#\:\$p>svg>foreignObject>section hr{height:0;padding-top:.25em}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre){border:1px solid var(--color-border-default);line-height:1.15;overflow:visible}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre)::part(auto-scaling){max-height:529px}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs){color:var(--color-prettylights-syntax-storage-modifier-import)}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-doctag),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-keyword),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-meta .hljs-keyword),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-template-tag),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-template-variable),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-type),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-variable.language_){color:var(--color-prettylights-syntax-keyword)}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-title),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-title.class_),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-title.class_.inherited__),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-title.function_){color:var(--color-prettylights-syntax-entity)}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-attr),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-attribute),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-literal),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-meta),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-number),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-operator),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-selector-attr),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-selector-class),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-selector-id),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-variable){color:var(--color-prettylights-syntax-constant)}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-meta .hljs-string),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-regexp),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-string){color:var(--color-prettylights-syntax-string)}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-built_in),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-symbol){color:var(--color-prettylights-syntax-variable)}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-code),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-comment),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-formula){color:var(--color-prettylights-syntax-comment)}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-name),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-quote),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-selector-pseudo),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-selector-tag){color:var(--color-prettylights-syntax-entity-tag)}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-subst){color:var(--color-prettylights-syntax-storage-modifier-import)}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-section){color:var(--color-prettylights-syntax-markup-heading);font-weight:700}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-bullet){color:var(--color-prettylights-syntax-markup-list)}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-emphasis){color:var(--color-prettylights-syntax-markup-italic);font-style:italic}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-strong){color:var(--color-prettylights-syntax-markup-bold);font-weight:700}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-addition){background-color:var(--color-prettylights-syntax-markup-inserted-bg);color:var(--color-prettylights-syntax-markup-inserted-text)}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-deletion){background-color:var(--color-prettylights-syntax-markup-deleted-bg);color:var(--color-prettylights-syntax-markup-deleted-text)}div#\:\$p>svg>foreignObject>section footer,div#\:\$p>svg>foreignObject>section header{color:var(--header-footer-color);font-size:18px;left:30px;margin:0;position:absolute}div#\:\$p>svg>foreignObject>section header{top:21px}div#\:\$p>svg>foreignObject>section footer{bottom:21px}div#\:\$p>svg>foreignObject>section{--h1-color:#246;--header-footer-color:hsla(0,0%,40%,.75);--heading-strong-color:#48c;--paginate-color:#777;align-items:stretch;display:flex;flex-flow:column nowrap;font-size:29px;height:720px;justify-content:center;padding:78.5px;width:1280px}div#\:\$p>svg>foreignObject>section{--marpit-root-font-size:29px}div#\:\$p>svg>foreignObject>section:where(.invert){--h1-color:#cee7ff;--header-footer-color:hsla(0,0%,60%,.75);--heading-strong-color:#7bf;--paginate-color:#999}div#\:\$p>svg>foreignObject>section>:last-child,div#\:\$p>svg>foreignObject>section[data-footer]>:nth-last-child(2){margin-bottom:0}div#\:\$p>svg>foreignObject>section>:first-child,div#\:\$p>svg>foreignObject>section>header:first-child+*{margin-top:0}div#\:\$p>svg>foreignObject>section:after{bottom:21px;color:var(--paginate-color);font-size:24px;padding:0;position:absolute;right:30px}div#\:\$p>svg>foreignObject>section:after{--marpit-root-font-size:24px}div#\:\$p>svg>foreignObject>section[data-color] :is(h1,marp-h1),div#\:\$p>svg>foreignObject>section[data-color] :is(h2,marp-h2),div#\:\$p>svg>foreignObject>section[data-color] :is(h3,marp-h3),div#\:\$p>svg>foreignObject>section[data-color] :is(h4,marp-h4),div#\:\$p>svg>foreignObject>section[data-color] :is(h5,marp-h5),div#\:\$p>svg>foreignObject>section[data-color] :is(h6,marp-h6){color:currentcolor}div#\:\$p>svg>foreignObject>section img[data-marp-twemoji]{background:transparent;height:1em;margin:0 .05em 0 .1em;vertical-align:-.1em;width:1em} -/* @theme cr */div#\:\$p>svg>foreignObject>section{background-image:url('./logo.svg');background-repeat:no-repeat;background-position:right calc(var(--marpit-root-font-size, 1rem) * 2) bottom calc(var(--marpit-root-font-size, 1rem) * 0.6);background-size:12%}div#\:\$p>svg>foreignObject>section :is(h1,marp-h1){color:#828db2;font-size:calc(var(--marpit-root-font-size, 1rem) * 2.1)}div#\:\$p>svg>foreignObject>section :is(h2,marp-h2){background-color:#828db2;color:#fff;padding:calc(var(--marpit-root-font-size, 1rem) * 0.3);font-size:calc(var(--marpit-root-font-size, 1rem) * 2.1)}div#\:\$p>svg>foreignObject>section p{font-size:calc(var(--marpit-root-font-size, 1rem) * 1.3)}div#\:\$p>svg>foreignObject>section ol,div#\:\$p>svg>foreignObject>section ul{font-size:calc(var(--marpit-root-font-size, 1rem) * 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Gears OSのファイルシステムとDB

琉球大学 理工学研究科 知能情報プログラム
河野研究室

又吉 雄斗, 佐野 巧曜, 河野 真治

-
+

システム全体の信頼性を上げたい

  • システムの構成要素全体の信頼性を上げる必要がある @@ -34,7 +34,7 @@
-
+

Gears OSを使って実現する

  • CodeGear @@ -55,7 +55,7 @@
-
+

信頼性を上げる方法

  • 証明 @@ -69,7 +69,7 @@
  • 既存システムの信頼性における問題点の解決
-
+

Continuation based C

  • Cの下位言語である
    • @@ -79,14 +79,14 @@
  • gotoによる軽量継続
-
+

CodeGearとmetaCodeGearの関係

  • ノーマルレベルとメタレベルの存在

-
+

Context

  • Gears OS上全てのCodeGear，DataGearの参照を持つ
    • @@ -103,7 +103,7 @@
-
+

3種類のGears OS

  • GearsAgda(Agda) @@ -123,11 +123,11 @@
-
+

CodeGear遷移の流れ

-
+

OSとFSとDBがバラバラ

    @@ -141,7 +141,7 @@
  • それぞれ別々なトランザクションがある
-
+

FSとDBをRedBlackTreeで統一

    @@ -155,7 +155,7 @@
-
+

ストレージ階層の多様性

  • HDDのような物理的制約(セクター，トラック)が無くなりつつある
    • @@ -169,7 +169,7 @@
  • メモリとディスクみたいな分け方が時代遅れに
-
+

ストレージ階層とアプリケーション

  • ファイルシステムやDBが多様なストレージ階層に対応していない @@ -183,7 +183,7 @@
-
+

実装がブロックベース

  • B-Treeによる実装 @@ -196,7 +196,7 @@
  • 証明しやすいRedBlackTreeを用いることが考えられる
-
+

データの持続性

    @@ -209,14 +209,15 @@
  • 非破壊的なRedBlackTree
    • +
  • スキーマ
    • -
    +

    非破壊的なRedBlackTree

    -
    +

    スキーマの問題

      @@ -228,26 +229,27 @@
  • 扱うデータはjsonなどで，もはや第一正規形でない
    • -
  • ファイルシステムには型が存在しない
    • -
    +

    Gears OSにおけるスキーマ

      +
    • ファイルシステムには型が存在しないがスキーマは必要
    • DBの各テーブルのレコードの型定義
    • Contextに登録されているDataGearの型
    • キーを用いたDataGearの参照
      • +
    • RedBlackTreeはDBのテーブル
    -
    -

    RedBlackTreeはDBのテーブル

    +
    +

    DBのトランザクション

      -
    • テーブルのキーがRedBlackTreeのkey
      • +
    • テーブルのキーはRedBlackTreeのkey
    • トランザクションはテーブルのルートの置き換え
    • 複数の書き込みポイント
    -
    +

    インピーダンスミスマッチ

    • プログラムで使用するデータ構造 @@ -268,7 +270,7 @@
    -
    +

    RedBlackTreeベースのファイルシステム

    • i-node番号をkeyにする
      • @@ -290,7 +292,7 @@
    -
    +

    バックアップとロールバック

      @@ -308,15 +310,8 @@
    -
    -

    RedBlackTreeによる権限の表現

    -
      -
    • metaDGで行う
      • -
    • ContextからアクセスできるRedBlackTreeがある
      • -
    -
    -
    -

    構成要素

    +
    +

    まとめf

    • すべてRedBlackTreeで構成されている
        @@ -328,10 +323,9 @@
    • バックアップとロールバック
      • -
    • 権限の表現
    -
    +

    信頼性の保証

      @@ -346,7 +340,7 @@
    -
    +

    色々問題はある

    • 非破壊ツリーのコピーはメモリ量的にダメではないか
      • @@ -360,7 +354,7 @@
    • メモリプロテクションなどの既存のシステムを使わなくて良いか
    -
    +

    今後の課題

      @@ -401,8 +395,10 @@ 最終的にFSのような柔軟性を持ち合わせることで解決

      ファイルシステムにも型は必要

      スキーマ必要だ． Gears OSではこのように表現できるね． でも変更されちゃうのはどうするの

      本システムでテーブルはこのように表現される->問題提起へ

      解決3 解決したいが...とone step置く

      本解決3

      SSD上のコピーという言葉が出てたよね -そのままコピーをSSDに置いているので，それをバックアップとして使える

      一旦解決したことをまとめて，その後評価

      このような正しさを確認していく必要があるし， -他にも問題はある(次のスライド)

      - 異なる計算機アーキテクチャ - - 異なるエンコード - - 異なる分散ノード

      \ No newline at end of file diff -r 4646c6f3a4c1 -r 6a8c564e7ab2 marp-slide/slide.md --- a/marp-slide/slide.md Mon May 15 20:16:50 2023 +0900 +++ b/marp-slide/slide.md Tue May 16 09:44:36 2023 +0900 @@ -203,6 +203,7 @@ - Copying GC - メモリ上とSSD上のデータ構造を統一 - 非破壊的なRedBlackTree +- スキーマ --- @@ -228,7 +229,6 @@ - DB理論が役に立たない - 過去のDBとの互換性がない - 扱うデータはjsonなどで，もはや第一正規形でない -- ファイルシステムには型が存在しない --- @@ -240,17 +240,19 @@ ## Gears OSにおけるスキーマ +- ファイルシステムには型が存在しないがスキーマは必要 - DBの各テーブルのレコードの型定義 - Contextに登録されているDataGearの型 - キーを用いたDataGearの参照 +- RedBlackTreeはDBのテーブル --- -## RedBlackTreeはDBのテーブル +## DBのトランザクション -- テーブルのキーがRedBlackTreeのkey +- テーブルのキーはRedBlackTreeのkey - トランザクションはテーブルのルートの置き換え - 複数の書き込みポイント @@ -301,18 +303,12 @@ - Copying GCによるバックアップ - ルートノードがデータのバージョン ---- - -## RedBlackTreeによる権限の表現 - -- metaDGで行う -- ContextからアクセスできるRedBlackTreeがある --- -## 構成要素 +## まとめf - すべてRedBlackTreeで構成されている - 検証はRedBlackTreeだけで良い @@ -321,7 +317,6 @@ - 持続性 - 柔軟なスキーマ - バックアップとロールバック -- 権限の表現 --- @@ -355,9 +350,11 @@ ## 今後の課題 - データクエリ言語