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<title data-rh="true">Efficient RxDB Queries via Query Cache | RxDB - JavaScript Database</title><meta data-rh="true" name="viewport" content="width=device-width,initial-scale=1"><meta data-rh="true" name="twitter:card" content="summary_large_image"><meta data-rh="true" property="og:image" content="https://rxdb.info/img/rxdb_social_card.png"><meta data-rh="true" name="twitter:image" content="https://rxdb.info/img/rxdb_social_card.png"><meta data-rh="true" property="og:url" content="https://rxdb.info/query-cache.html"><meta data-rh="true" property="og:locale" content="en"><meta data-rh="true" name="docusaurus_locale" content="en"><meta data-rh="true" name="docsearch:language" content="en"><meta data-rh="true" name="docusaurus_version" content="current"><meta data-rh="true" name="docusaurus_tag" content="docs-default-current"><meta data-rh="true" name="docsearch:version" content="current"><meta data-rh="true" name="docsearch:docusaurus_tag" content="docs-default-current"><meta data-rh="true" property="og:title" content="Efficient RxDB Queries via Query Cache | RxDB - JavaScript Database"><meta data-rh="true" name="description" content="Learn how RxDB's Query Cache boosts performance by reusing queries. Discover its default replacement policy and how to define your own."><meta data-rh="true" property="og:description" content="Learn how RxDB's Query Cache boosts performance by reusing queries. Discover its default replacement policy and how to define your own."><link data-rh="true" rel="icon" href="/img/favicon.ico"><link data-rh="true" rel="canonical" href="https://rxdb.info/query-cache.html"><link data-rh="true" rel="alternate" href="https://rxdb.info/query-cache.html" hreflang="en"><link data-rh="true" rel="alternate" href="https://rxdb.info/query-cache.html" hreflang="x-default"><link rel="preconnect" href="https://www.google-analytics.com">
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aria-label="Home page" class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">How RxDB works</span><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Query Cache</span><meta itemprop="position" content="2"></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>QueryCache</h1></header>
<p>RxDB uses a <code>QueryCache</code> which optimizes the reuse of queries at runtime. This makes sense especially when RxDB is used in UI-applications where people move for- and backwards on different routes or pages and the same queries are used many times. Because of the <a href="https://github.com/pubkey/event-reduce" target="_blank" rel="noopener noreferrer">event-reduce algorithm</a> cached queries are even valuable for optimization, when changes to the database occur between now and the last execution.</p>
<h2 class="anchor anchorWithStickyNavbar_LWe7" id="cache-replacement-policy">Cache Replacement Policy<a href="#cache-replacement-policy" class="hash-link" aria-label="Direct link to Cache Replacement Policy" title="Direct link to Cache Replacement Policy"></a></h2>
<p>To not let RxDB fill up all the memory, a <code>cache replacement policy</code> is defined that clears up the cached queries. This is implemented as a function which runs regularly, depending on when queries are created and the database is idle. The default policy should be good enough for most use cases but defining custom ones can also make sense.</p>
<h2 class="anchor anchorWithStickyNavbar_LWe7" id="the-default-policy">The default policy<a href="#the-default-policy" class="hash-link" aria-label="Direct link to The default policy" title="Direct link to The default policy"></a></h2>
<p>The default policy starts cleaning up queries depending on how much queries are in the cache and how much document data they contain.</p>
<ul>
<li>It will never uncache queries that have subscribers to their results</li>
<li>It tries to always have less than 100 queries without subscriptions in the cache.</li>
<li>It prefers to uncache queries that have never executed and are older than 30 seconds</li>
<li>It prefers to uncache queries that have not been used for longer time</li>
</ul>
<h2 class="anchor anchorWithStickyNavbar_LWe7" id="other-references-to-queries">Other references to queries<a href="#other-references-to-queries" class="hash-link" aria-label="Direct link to Other references to queries" title="Direct link to Other references to queries"></a></h2>
<p>With JavaScript, it is not possible to count references to variables. Therefore it might happen that an uncached <code>RxQuery</code> is still referenced by the users code and used to get results. This should never be a problem, uncached queries must still work. Creating the same query again however, will result in having two <code>RxQuery</code> instances instead of one.</p>
<h2 class="anchor anchorWithStickyNavbar_LWe7" id="using-a-custom-policy">Using a custom policy<a href="#using-a-custom-policy" class="hash-link" aria-label="Direct link to Using a custom policy" title="Direct link to Using a custom policy"></a></h2>
<p>A cache replacement policy is a normal JavaScript function according to the type <code>RxCacheReplacementPolicy</code>.
It gets the <code>RxCollection</code> as first parameter and the <code>QueryCache</code> as second. Then it iterates over the cached <code>RxQuery</code> instances and uncaches the desired ones with <code>uncacheRxQuery(rxQuery)</code>. When you create your custom policy, you should have a look at the <a href="https://github.com/pubkey/rxdb/blob/master/src/query-cache.ts" target="_blank" rel="noopener noreferrer">default</a>.</p>
<p>To apply a custom policy to a <code>RxCollection</code>, add the function as attribute <code>cacheReplacementPolicy</code>.</p>
<div class="language-ts codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-ts codeBlock_bY9V thin-scrollbar" style="color:#F8F8F2;background-color:#282A36"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">const</span><span class="token plain"> collection </span><span class="token operator">=</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">await</span><span class="token plain"> myDatabase</span><span class="token punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token function" style="color:rgb(80, 250, 123)">addCollections</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token punctuation" style="color:rgb(248, 248, 242)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> humans</span><span class="token operator">:</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> schema</span><span class="token operator">:</span><span class="token plain"> mySchema</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token function-variable function" style="color:rgb(80, 250, 123)">cacheReplacementPolicy</span><span class="token operator">:</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">function</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">{</span><span class="token plain"> </span><span class="token comment" style="color:rgb(98, 114, 164)">/* ... */</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token punctuation" style="color:rgb(248, 248, 242)">}</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</span><br></span></code></pre><div 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