July 2023
Intermediate to advanced
278 pages
5h 40m
Chinese
Content preview from Trino 权威指南：原书第2版
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连接器
|
107
头的表来浏览可用的数据，例如，使用
DESCRIBE monitor.current."trino.execution: name=
queryexecution";
。
以下是其他一些值得查看的
DESCRIBE
语句：
DESCRIBE monitor.current."trino.execution:name=querymanager";
DESCRIBE monitor.current."trino.memory:name=clustermemorymanager";
DESCRIBE monitor.current."trino.failuredetector:name=heartbeatfailuredetector";
要了解更多有关使用
Web UI
和其他相关方面监控
Trino
的信息，可以转到第
12
章。
6.8 black hole
连接器
black hole
连接器可以很容易地在
catalog
属性文件（如
etc/catalog/abyss.properties
）中
配置使用：
connector.name=blackhole
它作为任何数据的目标端，类似于
UNIX
操作系统中的
null
设备（
/dev/null
）。你可以从
其他
catalog
中读取数据，并把它作为插入数据查询的目标。因为它实际上不写入任何
内容，所以可以用它来度量从这些
catalog
中读取数据的性能。
例如，你可以在
abyss
中创建名为
test
的
schema
，并在
tpch.tiny
数据集中创建一个
表。然后，从
tpch.sf3 ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.