AVAILABILITYThe latest version of mytop is available from http://www.mysqlfanboy.com/mytop/ it might also be on CPAN as well.
REQUIREMENTSIn 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:
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 SupportIn additon, if you want a color mytop (recommended), install Term::ANSIColor from the CPAN:
Once you do, mytop will automatically use it. However, color is not yet working on Windows. Patches welcome. :-)
Optional Hi-Res TimingIf 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.
Platformsmytop 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.
DESCRIPTIONHelp 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 Basicsmytop 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 DisplayThe 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.
Argumentsmytop 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
- -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.
- --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.
- --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.
- --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.
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.
- --long or --nolong
For large numbers print all digits (e.g. 10.000) instead of using a more
compact approximation (e.g. 10.0k).
- -m or --mode mode
Specify initial mode qps(queries/second), top(overview),
cmd(command summary), innodb(InnoDB status) or status().
- --sort or --nosort
Reverse sort order from ascending to descending using Idle time.
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 FileInstead 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 KeysThe 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.
- Show ``command counters'' based on the Com_* values in SHOW STATUS. This is a new feature. Feedback welcome.
- Turn display color on and off. Default is on.
- Show only threads connected to a particular database.
- Given a thread id, display the entire query that thread was (and still may be) running.
- Disable all filtering (host, user, and db).
- Only show queries from a particular host.
- Toggle the header display. You can also specify either "header=0" or "header=1" in your config file to set the default behavior.
- 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.
- Switch to InnoDB Status mode. The output of ``SHOW INNODB STATUS'' will be displayed every cycle. In a future version, this may actually summarize that data rather than producing raw output.
- Kill a thread.
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.
- Reverse the default sort order.
- Pause display.
- Quit mytop
- Reset the server's status counters via a FLUSH STATUS command.
- Togle IP reverse lookup. Default is on.
- Change the sleep time (number of seconds between display refreshes).
- Set the number of seconds a query will need to run before it is considered old and will be highlighted.
- 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.
BUGSThis 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.
AUTHORmytop was developed and is maintained by Jeremy D. Zawodny ([email protected]).
If you wish to e-mail me regarding this software, PLEASE subscribe to the mytop mailing list. See the mytop homepage for details.
DISCLAIMERWhile 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.
RECRUITINGIf 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. :-(
COPYRIGHTCopyright (C) 2000-2010, Jeremy D. Zawodny.
CREDITSFix a bug. Add a feature. See your name here!
Many thanks go to these fine folks:
- Mark Grennan ([email protected]) 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 ([email protected])
- Suggested the idle/noidle stuff.
- Jan Willamowius ([email protected])
- Mirnor bug report. Documentation fixes.
- Alex Osipov ([email protected])
- Long command-line options, Unix socket support.
- Stephane Enten ([email protected])
- Suggested batch mode.
- Richard Ellerbrock ([email protected])
- Bug reports and usability suggestions.
- William R. Mattil ([email protected])
- Bug report about empty passwords not working.
- Benjamin Pflugmann ([email protected])
- Suggested -P command-line flag as well as other changes.
- Justin Mecham <[email protected]>
- Suggested setting $0 to `mytop'.
- Thorsten Kunz <[email protected]>
- 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 <[email protected]>
- Provided the idea of real-time queries per second in the main display.
- Paul DuBois <[email protected]>
- Pointed out some option-handling bugs.
- Mike Wexler <[email protected]>
- Suggested that we don't mangle (normalize) whitespace in query info by default.
- Mark Zweifel <[email protected]>
- Make the --idle command-line argument negatable.
- Axel Schwenke <[email protected]>
- Noticed the inccorect formula for query cache hit percentages in version 1.2.
- Steven Roussey <[email protected]>
- Supplied a patch to help filter binary junk in queries so that terminals don't freak out.
- jon r. luini <[email protected]>
- Supplied a patch that formed the basis for "--prompt" support. Sean Leach <[email protected]> submitted a similar patch.
- Yogish Baliga <[email protected]>
- Supplied a patch that formed the basis for "--resolve" support.
- Per Andreas Buer <[email protected]>
- 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.
LICENSEmytop is licensed under the GNU General Public License version 2. For the full license information, please visit http://www.gnu.org/copyleft/gpl.html