Provided by: mytop_1.9.1-4_all bug

NAME

       mytop - display MySQL server performance info like `top'

SYNOPSIS

       mytop [options]

AVAILABILITY

       The latest version of mytop is available from http://www.mysqlfanboy.com/mytop-3/ it might
       also be on CPAN as well.

REQUIREMENTS

       In order for mytop to function properly, you must have the following:

         * Perl 5.005 or newer
         * Config::IniFiles;
         * Getopt::Long
         * DBI and DBD::mysql
         * Term::ReadKey from CPAN

       Most systems are likely to have all of those installed--except for Term::ReadKey. You will
       need to pick that up from the CPAN. You can pick up Term::ReadKey here:

           http://search.cpan.org/search?dist=TermReadKey

       And you obviously need access to a MySQL server (version 3.22.x or 3.23.x) with the
       necessary security to run the SHOW PROCESSLIST and SHOW STATUS commands.

       If you are a Windows user, using ActiveState's Perl, you can use PPM (the Perl Package
       Manager) to install the MySQL and Term::ReadKey modules.

   Optional Color Support
       In additon, if you want a color mytop (recommended), install Term::ANSIColor from the
       CPAN:

           http://search.cpan.org/search?dist=ANSIColor

       Once you do, mytop will automatically use it. However, color is not yet working on
       Windows. Patches welcome. :-)

   Optional Hi-Res Timing
       If you want mytop to provide more accurate real-time queries-per-second statistics,
       install the Time::HiRes module from CPAN.  mytop will automatically notice that you have
       it and use it rather than the standard timing mechanism.

   Platforms
       mytop is known to work on:

         * Linux (2.2.x, 2.4.x)
         * FreeBSD (2.2, 3.x, 4.x)
         * Mac OS X
         * BSDI 4.x
         * Solaris 2.x
         * Windows NT 4.x (ActivePerl)

       If you find that it works on another platform, please let me know. Given that it is all
       Perl code, I expect it to be rather portable to Unix and Unix-like systems. Heck, it might
       even work on Win32 systems.

DESCRIPTION

       Help is always welcome in improving this software. Feel free to contact the author (see
       "AUTHOR" below) with bug reports, fixes, suggestions, and comments. Additionally "BUGS"
       will provide a list of things this software is not able to do yet.

       Having said that, here are the details on how it works and what you can do with it.

   The Basics
       mytop was inspired by the system monitoring tool top. I routinely use top on Linux,
       FreeBSD, and Solaris. You are likely to notice features from each of them here.

       mytop will connect to a MySQL server and periodically run the SHOW PROCESSLIST and SHOW
       STATUS commands and attempt to summarize the information from them in a useful format.

   The Display
       The mytop display screen is really broken into two parts. The top 4 lines (header) contain
       summary information about your MySQL server. For example, you might see something like:

       MySQL on localhost (4.0.13-log)                        up 1+11:13:00 [23:29:11]
        Queries: 19.3M  qps:  160 Slow:     1.0         Se/In/Up/De(%):    00/80/03/17
                    qps now:  219 Slow qps: 0.0  Threads:    1 (   1/  16) 00/74/00/25
        Key Efficiency: 99.3%  Bps in/out: 30.5k/162.8   Now in/out: 32.7k/ 3.3k

       The first line identifies the hostname of the server (localhost) and the version of MySQL
       it is running. The right had side shows the uptime of the MySQL server process in
       days+hours:minutes:seconds format (much like FreeBSD's top) as well as the current time.

       The second line displays the total number of queries the server has processed, the average
       number of queries per second, the number of slow queries, and the percentage of Select,
       Insert, Update, and Delete queries.

       The third real-time values. First is the number of queries per second, then the number of
       slow queries, followed by query precentages (like on the previous line).

       And the fourth line displays key buffer efficiency (how often keys are read from the
       buffer rather than disk) and the number of bytes that MySQL has sent and received, both
       over all and in the last cycle.

       You can toggle the header by hitting h when running mytop.

       The second part of the display lists as many threads as can fit on screen. By default they
       are sorted according to their idle time (least idle first). The display looks like:

           Id     User       Host      Dbase   Time      Cmd Query or State
           --     ----       ----      -----   ----      --- --------------
           61  jzawodn  localhost      music      0    Query show processlist

       As you can see, the thread id, username, host from which the user is connecting, database
       to which the user is connected, number of seconds of idle time, the command the thread is
       executing, and the query info are all displayed.

       Often times the query info is what you are really interested in, so it is good to run
       mytop in an xterm that is wider than the normal 80 columns if possible.

       The thread display color-codes the threads if you have installed color support. The
       current color scheme only works well in a window with a dark (like black) background. The
       colors are selected according to the "Command" column of the display:

           Query   -  Yellow
           Sleep   -  White
           Connect -  Green
           Slow    -  Bright
           Long    -  Magenta

       Those are purely arbitrary and will be customizable in a future release. If they annoy you
       just start mytop with the --nocolor flag or adjust your config file appropriately.

   Arguments
       mytop handles long and short command-line arguments. Not all options have both long and
       short formats, however. The long arguments have two dashes `--'. Short arguments only have
       one '-'.

       -u or --user username
           Username to use when logging in to the MySQL server. Default: ``root''.

       -p or --pass or --password password
           Password to use when logging in to the MySQL server. Default: none.

           WARNING: This is insecure as the password is visible for anyone.  See --prompt
           instead!

       -h or --host hostname[:port]
           Hostname of the MySQL server. The hostname may be followed by an option port number.
           Note that the port is specified separate from the host when using a config file.
           Default: ``localhost''.

       --port or -P port
           If you're running MySQL on a non-standard port, use this to specify the port number.
           Default: 3306.

       -s or --delay seconds
           How long between display refreshes. Default: 5

       -d or --db or --database database
           Use if you'd like mytop to connect to a specific database by default. Default: none.

       -b or --batch or --batchmode
           In batch mode, mytop runs only once, does not clear the screen, and places no limit on
           the number of lines it will print. This is suitable for running periodically (perhaps
           from cron) to capture the information into a file for later viewing. You might use
           batch mode in a CGI script to occasionally display your MySQL server status on the
           web.

           Default: unset.

       -S or --socket /path/to/socket
           If you're running mytop on the same host as MySQL, you may wish to have it use the
           MySQL socket directly rather than a standard TCP/IP connection. If you do,just specify
           one.

           Note that specifying a socket will make mytop ignore any host and/or port that you
           might have specified. If the socket does not exist (or the file specified is not a
           socket), this option will be ignored and mytop will use the hostname and port number
           instead.

           Default: none.

       --header or --noheader
           Specify if you want the header to display or not. You can toggle this with the h key
           while mytop is running.

           Default: header.

       --color or --nocolor
           Specify if you want a color display. This has no effect if you don't have color
           support available.

           Default: If you have color support, mytop will try color unless you tell it not to.

       -i or --idle or --noi or --noidle
           Specify if you want idle (sleeping) threads to appear in the list. If sleeping threads
           are omitted, the default sorting order is reversed so that the longest running queries
           appear at the top of the list.

           Default: idle.

       --prompt or --noprompt
           Specify if you want to be prompted to type in your database password.  This provides a
           little bit more security since it not only prevents the password from viewable in a
           process list, but also doesn't require the password to be stored in plain text in your
           "~/.mytop" config file.  You will only be prompted if a password has not been
           specified in your config file or through another command line option.

           Default: noprompt.

       --resolve
           If you have skip-resolve set on MySQL (to keep it from doing a reverse DNS lookup on
           each inbound connection), mytop can replace IP addresses with hostnames but toggling
           this option.

           Default: noresolve

       --long or --nolong
           For large numbers print all digits (e.g. 10.000) instead of using a more compact
           approximation (e.g. 10.0k).

           Default: nolong.

       -m or --mode mode
           Specify initial mode qps(queries/second), top(overview), cmd(command summary),
           innodb(InnoDB status) or status().

           Default: top

       --sort or --nosort
           Reverse sort order from ascending to descending using Idle time.

           Default: nosort.

       Command-line arguments will always take precedence over config file options. That happens
       because the config file is read BEFORE the command-line arguments are applied.

   Config File
       Instead of always using bulky command-line parameters, you can also use a config file in
       your home directory ("~/.mytop"). If present, mytop will read it automatically. It is read
       before any of your command-line arguments are processed, so your command-line arguments
       will override directives in the config file.

       Here is a sample config file "~/.mytop" which implements the defaults described above.

         user=root
         pass=
         host=localhost
         db=test
         delay=5
         port=3306
         slow=10
         socket=
         batchmode=0
         header=1
         color=1
         idle=1
         long=120

       Using a config file will help to ensure that your database password isn't visible to users
       on the command-line. Just make sure that the permissions on "~/.mytop" are such that
       others cannot read it (unless you want them to, of course).

       You may have white space on either side of the "=" in lines of the config file.

       If present, mytop will also read mysql's default config file "~/.my.cnf".  Values from
       both the [client] and [mytop] section are read, in this order.  The long options database
       and password are preferred over the short versions db and pass to match mysql's syntax.
       These settings take lowest precedence and will be overwritten by either values in
       "~/.mytop" or command-line options.

   Shortcut Keys
       The following keys perform various actions while mytop is running. Those which have not
       been implemented are listed as such. They are included to give the user idea of what is
       coming.

       ?   Display help.

       c   Show "command counters" based on the Com_* values in SHOW STATUS.  This is a new
           feature.  Feedback welcome.

       C   Turn display color on and off. Default is on.

       d   Show only threads connected to a particular database.

       f   Given a thread id, display the entire query that thread was (and still may be)
           running.

       F   Disable all filtering (host, user, and db).

       h   Only show queries from a particular host.

       H   Toggle the header display. You can also specify either "header=0" or "header=1" in
           your config file to set the default behavior.

       i   Toggle the display of idle (sleeping) threads. If sleeping threads are filtered, the
           default sorting order is reversed so that the longest running queries appear at the
           top of the list.

       I   Switch to InnoDB Status mode. The output of "SHOW ENGINE INNODB STATUS" will be
           displayed every cycle. In a future version, this may actually summarize that data
           rather than producing raw output.

       k   Kill a thread.

       m   Toggle modes. Currently this switches from `top' mode to `qps' (Queries Per Second
           Mode). In this mode, mytop will write out one integer per second. The number written
           reflects the number of queries executed by the server in the previous one second
           interval.

           More modes may be added in the future.

       o   Reverse the default sort order.

       p   Pause display.

       q   Quit mytop

       r   Reset the server's status counters via a FLUSH STATUS command.

       R   Togle IP reverse lookup. Default is on.

       s   Change the sleep time (number of seconds between display refreshes).

       S   Set the number of seconds a query will need to run before it is considered old and
           will be highlighted.

       u   Show only threads owned by a giver user.

       The s key has a command-line counterpart: -s.

       The h key has two command-line counterparts: --header and --noheader.

BUGS

       This is more of a BUGS + WishList.

       Some performance information is not available when talking to a version 3.22.x MySQL
       server. Additional information (about threads mostly) was added to the output of SHOW
       STATUS in MySQL 3.23.x and mytop makes use of it. If the information is not available, you
       will simply see zeros where the real numbers should be.

       Simply running this program will increase your overall counters (such as the number of
       queries run). But you may or may not view that as a bug.

       mytop consumes too much CPU time when running (verified on older versions of Linux and
       FreeBSD). It's likely a problem related to Term::ReadKey. I haven't had time to
       investigate yet, so mytop now automatically lowers its priority when you run it. You may
       also think about running mytop on another workstation instead of your database server.
       However, "mytop" on Solaris does not have this problem.  Newer versions of Linux and
       FreeBSD seem to have fixed this.

       You can't specify the maximum number of threads to list. If you have many threads and a
       tall xterm, mytop will always try to display as many as it can fit.

       The size of most of the columns in the display has a small maximum width. If you have
       fairly long database/user/host names the display may appear odd. I have no good idea as to
       how best to deal with that yet. Suggestions are welcome.

       You should be able to specify the columns you'd like to see in the display and the order
       in which they appear. If you only have one username that connects to your database, it's
       probably not worth having the User column appear, for example.

AUTHOR

       mytop was developed and is maintained by Jeremy D. Zawodny (Jeremy@Zawodny.com).

       If you wish to e-mail me regarding this software, PLEASE subscribe to the mytop mailing
       list.  See the mytop homepage for details.

DISCLAIMER

       While I use this software in my job at Yahoo!, I am solely responsible for it. Yahoo! does
       not necessarily support this software in any way. It is merely a personal idea which
       happened to be very useful in my job.

RECRUITING

       If you hack Perl and grok MySQL, come work at Yahoo! Contact me for details. Or just send
       me your resume. Er, unless we just had layoffs, in which case we're not hiring. :-(

SEE ALSO

       Please check the MySQL manual if you're not sure where some of the output of mytop is
       coming from.

COPYRIGHT

       Copyright (C) 2000-2010, Jeremy D. Zawodny.

CREDITS

       Fix a bug. Add a feature. See your name here!

       Many thanks go to these fine folks:

       Mark Grennan (mark@grennan.com) www.linuxfangoy.com
           Added updates for MySQL 5.x. Added 'S' (slow) highlighting.  Added 'C' to turn on and
           off Color. Added 'l' command to change color for long running queries. Fixed a few
           documentation issues.  Monitors Slave status. Added color to Queue hit ratio.  Added
           number of rows sorted per second.  Created release 1.7.

       Sami Ahlroos (sami@avis-net.de)
           Suggested the idle/noidle stuff.

       Jan Willamowius (jan@janhh.shnet.org)
           Mirnor bug report. Documentation fixes.

       Alex Osipov (alex@acky.net)
           Long command-line options, Unix socket support.

       Stephane Enten (tuf@grolier.fr)
           Suggested batch mode.

       Richard Ellerbrock (richarde@eskom.co.za)
           Bug reports and usability suggestions.

       William R. Mattil (wrm@newton.irngtx.tel.gte.com)
           Bug report about empty passwords not working.

       Benjamin Pflugmann (philemon@spin.de)
           Suggested -P command-line flag as well as other changes.

       Justin Mecham <justin@aspect.net>
           Suggested setting $0 to `mytop'.

       Thorsten Kunz <thorsten.kunz@de.tiscali.com>
           Provided a fix for cases when we try remove the domain name from the display even if
           it is actually an IP address.

       Sasha Pachev <sasha@mysql.com>
           Provided the idea of real-time queries per second in the main display.

       Paul DuBois <paul@snake.net>
           Pointed out some option-handling bugs.

       Mike Wexler <mwexler@tias.com>
           Suggested that we don't mangle (normalize) whitespace in query info by default.

       Mark Zweifel <markez@yahoo-inc.com>
           Make the --idle command-line argument negatable.

       Axel Schwenke <schwenke@jobpilot.de>
           Noticed the inccorect formula for query cache hit percentages in version 1.2.

       Steven Roussey <sroussey@network54.com>
           Supplied a patch to help filter binary junk in queries so that terminals don't freak
           out.

       jon r. luini <falcon@chime.com>
           Supplied a patch that formed the basis for "--prompt" support.  Sean Leach
           <sleach@wiggum.com> submitted a similar patch.

       Yogish Baliga <baliga@yahoo-inc.com>
           Supplied a patch that formed the basis for "--resolve" support.

       Per Andreas Buer <perbu@linpro.no>
           Supplied an excellent patch to tidy up the top display.  This includes showing most
           values in short form, such as 10k rather than 10000.

       See the Changes file on the mytop distribution page for more details on what has changed.

LICENSE

       mytop is licensed under the GNU General Public License version 2. For the full license
       information, please visit http://www.gnu.org/copyleft/gpl.html