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clickhouse.html
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<!DOCTYPE html>
<!--[if IEMobile 7 ]><html class="no-js iem7"><![endif]-->
<!--[if lt IE 9]><html class="no-js lte-ie8"><![endif]-->
<!--[if (gt IE 8)|(gt IEMobile 7)|!(IEMobile)|!(IE)]><!--><html class="no-js"><!--<![endif]-->
<head>
<meta charset="utf-8">
<title>
clickhouse - 搁羽念风
</title>
<meta name="author" content="">
<meta name="description" content="">
<meta name="HandheldFriendly" content="True">
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<article>
<header>
<h1 class="entry-title"><a href="15553150635573.html">给clickhouse 物化视图增加字段</a></h1>
<p class="meta"><time datetime="2019-04-15T15:57:43+08:00"
pubdate data-updated="true">2019/4/15</time></p>
</header>
<div class="entry-content">
<pre class="line-numbers"><code class="language-sql">-- 先查找一下sql路径
SELECT metadata_path FROM system.tables WHERE name = 'demo';
-- 摘除掉视图
DETACH table mid.play_block_status
-- 为 .inner.demo 表增加字段
alter table mid.`.inner.demo` add column ip String;
alter table mid.`.inner.demo` add column operator String;
-- 为 物化视图增加字段
根据第一步 查到的 metadata_path 路径, 为视图修改表结构
-- 重新加载视图
ATTACH table mid.play_block_status
</code></pre>
</div>
</article>
<article>
<header>
<h1 class="entry-title"><a href="15543440484929.html">查看表占用磁盘空间大小</a></h1>
<p class="meta"><time datetime="2019-04-04T10:14:08+08:00"
pubdate data-updated="true">2019/4/4</time></p>
</header>
<div class="entry-content">
<pre class="line-numbers"><code class="language-sql">SELECT table, formatReadableSize(size) as size, rows, days, formatReadableSize(avgDaySize) as avgDaySize FROM (
SELECT
table,
sum(bytes) AS size,
sum(rows) AS rows,
min(min_date) AS min_date,
max(max_date) AS max_date,
(max_date - min_date) AS days,
size / (max_date - min_date) AS avgDaySize
FROM system.parts
WHERE active
GROUP BY table
ORDER BY rows DESC
)
</code></pre>
</div>
</article>
<article>
<header>
<h1 class="entry-title"><a href="15511647865786.html">clickhouse 奇技淫巧</a></h1>
<p class="meta"><time datetime="2019-02-26T15:06:26+08:00"
pubdate data-updated="true">2019/2/26</time></p>
</header>
<div class="entry-content">
<h2 id="toc_0">函数</h2>
<blockquote>
<p><code>positionCaseInsensitive</code> 不区分大小写,查找字符串的所在位置, 未找到则为0<br/>
<code>positionCaseInsensitiveUTF8</code> 同上,不过汉字也算作一个字符<br/>
<code>cityHash64</code> 快速哈希,规则相同<br/>
<code>groupArray</code> 根据group 将一个或者多个字段合并成数组<br/>
<code>intDiv</code> 整除,intDiv(时间戳, 3600)*3600 即可按照每小时分组</p>
</blockquote>
<h2 id="toc_1">常用</h2>
<blockquote>
<p><code>optimize table 表名</code> 如果是一个 聚合类型表,那么可以将主动触发一次聚合</p>
</blockquote>
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