84 lines
2.3 KiB
HTML
84 lines
2.3 KiB
HTML
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<!doctype html>
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<html>
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<head>
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<meta charset="utf-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1" />
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<link
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rel="stylesheet"
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href="https://cdnjs.cloudflare.com/ajax/libs/github-markdown-css/5.2.0/github-markdown-dark.min.css"
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/>
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<title>haunt98 posts</title>
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</head>
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<style>
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.markdown-body {
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box-sizing: border-box;
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min-width: 200px;
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max-width: 980px;
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margin: 0 auto;
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padding: 45px;
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}
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@media (max-width: 767px) {
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.markdown-body {
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padding: 15px;
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}
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}
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</style>
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<body class="markdown-body">
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<div><a href="index.html">Index</a></div>
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<h1>
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<a
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id="user-content-cache-shenanigan"
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class="anchor"
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aria-hidden="true"
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href="#cache-shenanigan"
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><span aria-hidden="true" class="octicon octicon-link"></span></a
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>Cache shenanigan
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</h1>
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<p>
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My notes/mistakes/... when using cache (mainly Redis) from time to time
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</p>
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<p>My default strategy is:</p>
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<ul>
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<li>Write to database first then to cache second</li>
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<li>
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Read from cache first, if not found then read from database second, then
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re-write to cache
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</li>
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</ul>
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<p>It's good for general cases, for example with CRUD action.</p>
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<p>
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The bad things happen when cache and database are not consistent. For
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example what happen if writing database OK then writing cache failed? Now
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database has new value, but cache has old value Then when we read again,
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we read cache first with old value, and that is disaster.
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</p>
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<h2>
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<a
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id="user-content-thanks"
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class="anchor"
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aria-hidden="true"
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href="#thanks"
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><span aria-hidden="true" class="octicon octicon-link"></span></a
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>Thanks
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</h2>
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<ul>
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<li>
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<a
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href="https://danielw.cn/cache-consistency-with-database"
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rel="nofollow"
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>Cache Consistency with Database</a
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>
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</li>
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</ul>
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<div>
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Feel free to ask me via
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<a href="mailto:hauvipapro+posts@gmail.com">email</a> or
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<a rel="me" href="https://hachyderm.io/@haunguyen">Mastodon</a>. Source
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code is available on
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<a href="https://github.com/haunt98/posts-go">GitHub</a>
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</div>
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</body>
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</html>
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