<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Pulsar SQL Overview · Apache Pulsar</title><meta name="viewport" content="width=device-width, initial-scale=1.0"/><meta name="generator" content="Docusaurus"/><meta name="description" content="Apache Pulsar is used to store streams of event data, and the event data is structured with predefined fields. With the implementation of the [Schema Registry](/docs/en/2.6.3/schema-get-started), you can store structured data in Pulsar and query the data by using [Presto](https://prestosql.io/).  "/><meta name="docsearch:version" content="2.6.3"/><meta name="docsearch:language" content="en"/><meta property="og:title" content="Pulsar SQL Overview · Apache Pulsar"/><meta property="og:type" content="website"/><meta property="og:url" content="https://pulsar.apache.org/"/><meta property="og:description" content="Apache Pulsar is used to store streams of event data, and the event data is structured with predefined fields. With the implementation of the [Schema Registry](/docs/en/2.6.3/schema-get-started), you can store structured data in Pulsar and query the data by using [Presto](https://prestosql.io/).  "/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://pulsar.apache.org/img/pulsar.svg"/><link rel="shortcut icon" href="/img/pulsar.ico"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/atom-one-dark.min.css"/><link rel="alternate" type="application/atom+xml" href="https://pulsar.apache.org/blog/atom.xml" title="Apache Pulsar Blog ATOM Feed"/><link rel="alternate" type="application/rss+xml" href="https://pulsar.apache.org/blog/feed.xml" title="Apache Pulsar Blog RSS Feed"/><link rel="stylesheet" href="/css/code-blocks-buttons.css"/><script type="text/javascript" src="https://buttons.github.io/buttons.js"></script><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.0/clipboard.min.js"></script><script type="text/javascript" src="/js/custom.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head><body class="sideNavVisible separateOnPageNav"><div class="fixedHeaderContainer"><div class="headerWrapper wrapper"><header><a href="/en"><img class="logo" src="/img/pulsar.svg" alt="Apache Pulsar"/></a><a href="/en/versions"><h3>2.6.3</h3></a><div class="navigationWrapper navigationSlider"><nav class="slidingNav"><ul class="nav-site nav-site-internal"><li class="siteNavGroupActive"><a href="/docs/en/2.6.3/getting-started-standalone" target="_self">Docs</a></li><li class=""><a href="/en/download" target="_self">Download</a></li><li class="siteNavGroupActive"><a href="/docs/en/2.6.3/client-libraries" target="_self">Clients</a></li><li class=""><a href="#restapis" target="_self">REST APIs</a></li><li class=""><a href="#cli" target="_self">Cli</a></li><li class=""><a href="/blog/" target="_self">Blog</a></li><li class=""><a href="#community" target="_self">Community</a></li><li class=""><a href="#apache" target="_self">Apache</a></li><li class=""><a href="https://pulsar-next.staged.apache.org/" target="_self">New Website (Beta)</a></li><span><li><a id="languages-menu" href="#"><img class="languages-icon" src="/img/language.svg" alt="Languages icon"/>English</a><div id="languages-dropdown" class="hide"><ul id="languages-dropdown-items"><li><a href="/docs/ja/2.6.3/sql-overview">日本語</a></li><li><a href="/docs/fr/2.6.3/sql-overview">Français</a></li><li><a href="/docs/ko/2.6.3/sql-overview">한국어</a></li><li><a href="/docs/zh-CN/2.6.3/sql-overview">中文</a></li><li><a href="/docs/zh-TW/2.6.3/sql-overview">繁體中文</a></li><li><a href="https://crowdin.com/project/apache-pulsar" target="_blank" rel="noreferrer noopener">Help Translate</a></li></ul></div></li><script>
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class="navItem" href="/docs/en/2.6.3/functions-cli">Reference: CLI</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.3/window-functions-context">Window Functions: Context</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Pulsar IO</h3><ul class=""><li class="navListItem"><a class="navItem" href="/docs/en/2.6.3/io-overview">Overview</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.3/io-quickstart">Get started</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.3/io-use">Use</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.3/io-debug">Debug</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.3/io-connectors">Built-in connector</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.3/io-cdc">CDC connector</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.3/io-develop">Develop</a></li><li class="navListItem"><a class="navItem" 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class="navListItem"><a class="navItem" href="/docs/en/2.6.3/administration-zk-bk">ZooKeeper and BookKeeper</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.3/administration-geo">Geo-replication</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.3/administration-pulsar-manager">Pulsar Manager</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.3/administration-stats">Pulsar statistics</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.3/administration-load-balance">Load balance</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.3/administration-proxy">Pulsar proxy</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.3/administration-upgrade">Upgrade</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Security</h3><ul class=""><li class="navListItem"><a class="navItem" href="/docs/en/2.6.3/security-overview">Overview</a></li><li class="navListItem"><a 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<p>As the core of Pulsar SQL, Presto Pulsar connector enables Presto workers within a Presto cluster to query data from Pulsar.</p>
<p><img src="/docs/assets/pulsar-sql-arch-2.png" alt="The Pulsar consumer and reader interfaces"></p>
<p>The query performance is efficient and highly scalable, because Pulsar adopts <a href="/docs/en/2.6.3/concepts-architecture-overview#apache-bookkeeper">two level segment based architecture</a>.</p>
<p>Topics in Pulsar are stored as segments in <a href="https://bookkeeper.apache.org/">Apache BookKeeper</a>. Each topic segment is replicated to some BookKeeper nodes, which enables concurrent reads and high read throughput. You can configure the number of BookKeeper nodes, and the default number is <code>3</code>. In Presto Pulsar connector, data is read directly from BookKeeper, so Presto workers can read concurrently from horizontally scalable number BookKeeper nodes.</p>
<p><img src="/docs/assets/pulsar-sql-arch-1.png" alt="The Pulsar consumer and reader interfaces"></p>
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