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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132
|
第
8
章
8.2 Trino
系统表
Trino
的系统表不需要通过
catalog
文件进行配置，系统表的所有的
schema
和表都在
system
catalog
中自动提供。
你可以使用
8.1
节中提到的语句来查询
schema
和表，以了解关于
Trino
运行实例的更多
信息。可用的数据包括运行时、节点、
catalog
等，这些信息可以让你更好地理解和使用
Trino
。
Trino Web UI
是一个基于网页的用户界面，显示了系统表的相关信息。更多
详细信息参见
12.1
节。
系统表包含的
schema
：
SHOW SCHEMAS IN system;
Schema
--------------------
information_schema
jdbc
metadata
runtime
(4 rows)
为了进行查询调优，表
system.runtime.queries
和
system.runtime.tasks
是最有用的：
DESCRIBE system.runtime.queries;
Column | Type | Extra | Comment
-------------------+-----------------------------+-------+---------
query_id | varchar | |
state | varchar | |
user | varchar | |
source | varchar | |
query | varchar | |
resource_group_id ...
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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.