Question

MySQL table information_schema

Asked by: julianmatz

Hi! I recently upgraded MySQL to version 5 and also updated to the latest Debian version of phpMyAdmin (2.9). I noticed that each MySQL user has an extra table - information_schema (16).

I presume this is normal?? I mean, I also noticed that users can only view records but not edit privileges or anything... It's obviously there to view user's settings/privileges... That's ok, right?

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Asked On
2007-08-11 at 20:42:16ID22757055
Tags

information_schema

,

mysql

Topic

MySQL Server

Participating Experts
2
Points
500
Comments
3

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Answers

 

by: teraplanePosted on 2007-08-11 at 22:58:04ID: 19678304

The information_schema  is there as meta data, or a table about tables. (Orcale has had this for ages). It is there when you want to get a query that can return info about tables and columns within tables etc.

All user setting are still maintained the old way, in the uers and priviliges tables.

 

by: todd_farmerPosted on 2007-08-11 at 23:32:45ID: 19678344

Teraplane is exactly right, but I thought I would add a link to the MySQL documentation on the information_schema database:

http://dev.mysql.com/doc/refman/5.0/en/information-schema.html

It's very useful for finding the definitions of tables, columns, views and other database objects without parsing SHOW CREATE TABLE or similar commands.  For example, if you want to know all the tables that have a column with the name "id":

SELECT table_name FROM information_schema.columns WHERE column_name = 'id';

 

by: julianmatzPosted on 2007-09-07 at 20:55:12ID: 19852299

Thanks!

20120131-EE-VQP-002

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