pt-show-grants(1) Canonicalize and print MySQL grants so you can effectively replicate, compare and version-control them.


Usage: pt-show-grants [OPTIONS] [DSN]

pt-show-grants shows grants (user privileges) from a MySQL server.


pt-show-grants --separate --revoke | diff othergrants.sql -


Percona Toolkit is mature, proven in the real world, and well tested, but all database tools can pose a risk to the system and the database server. Before using this tool, please:
  • Read the tool's documentation
  • Review the tool's known ``BUGS''
  • Test the tool on a non-production server
  • Backup your production server and verify the backups


pt-show-grants extracts, orders, and then prints grants for MySQL user accounts.

Why would you want this? There are several reasons.

The first is to easily replicate users from one server to another; you can simply extract the grants from the first server and pipe the output directly into another server.

The second use is to place your grants into version control. If you do a daily automated grant dump into version control, you'll get lots of spurious changesets for grants that don't change, because MySQL prints the actual grants out in a seemingly random order. For instance, one day it'll say

  GRANT DELETE, INSERT, UPDATE ON `test`.* TO 'foo'@'%';

And then another day it'll say

  GRANT INSERT, DELETE, UPDATE ON `test`.* TO 'foo'@'%';

The grants haven't changed, but the order has. This script sorts the grants within the line, between 'GRANT' and 'ON'. If there are multiple rows from SHOW GRANTS, it sorts the rows too, except that it always prints the row with the user's password first, if it exists. This removes three kinds of inconsistency you'll get from running SHOW GRANTS, and avoids spurious changesets in version control.

Third, if you want to diff grants across servers, it will be hard without ``canonicalizing'' them, which pt-show-grants does. The output is fully diff-able.

With the ``--revoke'', ``--separate'' and other options, pt-show-grants also makes it easy to revoke specific privileges from users. This is tedious otherwise.


This tool accepts additional command-line arguments. Refer to the ``SYNOPSIS'' and usage information for details.
Prompt for a password when connecting to MySQL.
short form: -A; type: string

Default character set. If the value is utf8, sets Perl's binmode on STDOUT to utf8, passes the mysql_enable_utf8 option to DBD::mysql, and runs SET NAMES UTF8 after connecting to MySQL. Any other value sets binmode on STDOUT without the utf8 layer, and runs SET NAMES after connecting to MySQL.

type: Array

Read this comma-separated list of config files; if specified, this must be the first option on the command line.

short form: -D; type: string

The database to use for the connection.

short form: -F; type: string

Only read mysql options from the given file. You must give an absolute pathname.

Add DROP USER before each user in the output.
Add FLUSH PRIVILEGES after output.

You might need this on pre-4.1.1 servers if you want to drop a user completely.

default: yes

Print dump header.

The header precedes the dumped grants. It looks like:

  -- Grants dumped by pt-show-grants 1.0.19
  -- Dumped from server Localhost via UNIX socket, MySQL 5.0.82-log at 2009-10-26 10:01:04

See also ``--[no]timestamp''.

Show help and exit.
short form: -h; type: string

Connect to host.

type: array

Ignore this comma-separated list of users.

type: array

Only show grants for this comma-separated list of users.

short form: -p; type: string

Password to use when connecting. If password contains commas they must be escaped with a backslash: ``exam\,ple''

type: string

Create the given PID file. The tool won't start if the PID file already exists and the PID it contains is different than the current PID. However, if the PID file exists and the PID it contains is no longer running, the tool will overwrite the PID file with the current PID. The PID file is removed automatically when the tool exits.

short form: -P; type: int

Port number to use for connection.

Add REVOKE statements for each GRANT statement.
List each GRANT or REVOKE separately.

The default output from MySQL's SHOW GRANTS command lists many privileges on a single line. With ``--flush'', places a FLUSH PRIVILEGES after each user, instead of once at the end of all the output.

type: Array

Set the MySQL variables in this comma-separated list of "variable=value" pairs.

By default, the tool sets:


Variables specified on the command line override these defaults. For example, specifying "--set-vars wait_timeout=500" overrides the defaultvalue of 10000.

The tool prints a warning and continues if a variable cannot be set.

short form: -S; type: string

Socket file to use for connection.

default: yes

Add timestamp to the dump header.

See also ``--[no]header''.

short form: -u; type: string

User for login if not current user.

Show version and exit.


These DSN options are used to create a DSN. Each option is given like "option=value". The options are case-sensitive, so P and p are not the same option. There cannot be whitespace before or after the "=" and if the value contains whitespace it must be quoted. DSN options are comma-separated. See the percona-toolkit manpage for full details.
  • A

    dsn: charset; copy: yes

    Default character set.

  • D

    dsn: database; copy: yes

    Default database.

  • F

    dsn: mysql_read_default_file; copy: yes

    Only read default options from the given file

  • h

    dsn: host; copy: yes

    Connect to host.

  • p

    dsn: password; copy: yes

    Password to use when connecting. If password contains commas they must be escaped with a backslash: ``exam\,ple''

  • P

    dsn: port; copy: yes

    Port number to use for connection.

  • S

    dsn: mysql_socket; copy: yes

    Socket file to use for connection.

  • u

    dsn: user; copy: yes

    User for login if not current user.


The environment variable "PTDEBUG" enables verbose debugging output to STDERR. To enable debugging and capture all output to a file, run the tool like:

   PTDEBUG=1 pt-show-grants ... > FILE 2>&1

Be careful: debugging output is voluminous and can generate several megabytes of output.


You need Perl, DBI, DBD::mysql, and some core packages that ought to be installed in any reasonably new version of Perl.


For a list of known bugs, see <>.

Please report bugs at <>. Include the following information in your bug report:

  • Complete command-line used to run the tool
  • Tool ``--version''
  • MySQL version of all servers involved
  • Output from the tool including STDERR
  • Input files (log/dump/config files, etc.)

If possible, include debugging output by running the tool with "PTDEBUG"; see ``ENVIRONMENT''.


Visit <> to download the latest release of Percona Toolkit. Or, get the latest release from the command line:


You can also get individual tools from the latest release:


Replace "TOOL" with the name of any tool.


Baron Schwartz


This tool is part of Percona Toolkit, a collection of advanced command-line tools for MySQL developed by Percona. Percona Toolkit was forked from two projects in June, 2011: Maatkit and Aspersa. Those projects were created by Baron Schwartz and primarily developed by him and Daniel Nichter. Visit <> to learn about other free, open-source software from Percona.


This program is copyright 2011-2016 Percona LLC and/or its affiliates, 2007-2011 Baron Schwartz.


This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2; OR the Perl Artistic License. On UNIX and similar systems, you can issue `man perlgpl' or `man perlartistic' to read these licenses.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.


pt-show-grants 2.2.17