Save time use MySQL auto completion for database or table names

Posted on in Categories Howto, MySQL last updated January 16, 2007

There is a quick way to type both MySQL database and table names quickly by enabling MySQL auto completion feature. This is called automatic rehashing. This option is on by default, which enables table and column name completion.

First connect to mysql database called foo:

$ mysql -u vivek -p foo
Now let us say you would like to list all records from tables wp_users. Type select * from w and press tab key to complete table name:
mysql> select * from w {Press TAB KEY}

Please note that if the partial name is unique, mysql will completes it for you. Otherwise, you can hit tab key again to see all possible matches.

Auto-completion enables you to cut down typing time and great way to speed up your work :)

If you don’t use this feature, disable this feature by passing -A or –skip-auto-rehash option to mysql. That causes mysql to start faster.
$ mysql -A -u vivek -p foo

10 comment

  1. Great tip! You do have to have done a “use database” at least once before in your session, because that’s when it loads all that information in. Also, does that trick work on Unix only or on Windows too? (Mac OS X = Unix)

  2. Hmm..

    mysql -u vivek -p foo

    foo is database name; so no need to use database name again (foo is not my password) :). Otherwise execute use database as suggested by you.

    I have not tested this on Microsoft Windows. But it should work as this is mysql client feature.

    Appreciate your post.

  3. This doesn’t appear to work on Windows with cmd.exe. Does anyone know if it’s possible to get mysql tab-completion working with cmd.exe? If it is, then any additional guidance on how to get it set up would be great.

  4. hi,

    i reached here searching how to enable the feature, as you said in this post:

    however, you only say here that it’s enabled by default, and how to disable it.

    i have an installation where it seems to be disabled (compiled mysql5 on a debian etch system), and i was hoping to find a way to enable it. there is another mysql installation (version 4) on the same machine that has tab completion.

  5. The underlying feature in MySQL is called rehashing. There are a number of command line flags (and associated options in my.cnf) to enable, disable or skip this. See this for more information.

    Tip: If it’s not working, issue the ‘rehash’ command from the MySQL command line interface.

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