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MYSQL-GENOCIDE(1) User Contributed Perl Documentation MYSQL-GENOCIDE(1)
 

mysql-genocide - Parallel operation on MySQL processlist

mysql-genocide [OPTIONS] [FILTER]
 Options:
   -h, --help               Show help.
   Connection:
   -h, --host=name          Connect to host.
   -P, --port=#             Port number to use for connection.
   -D, --database=name      Database to use.
   -u, --user=name          User for login if not current user.
   -p, --password=name      Password to use when connecting to server.
   Filters:
   -e, --exclude            Exclude queries by different criteria
   -s, --selects-only       Exclude everything but selects
   -t, --min-time=#         Exclude queries with exec time lower than #
   -T, --timeout            Exclude queries with exec time lower than query time hint
   -l, --limit=#            Only take first # lines
   -g, --placeholder        Replace values in queries by placeholders
   -d, --distinct           Only keep the first occurence of the same query
   --sort                   Sort result
   Actions:
   -L, --list               Output list of queries
   -K, --kill               Kill every matched threads
   -S, --stats              Show some stats about processlist
   -i, --interval[=#]       Repeat the command at regular interval

--help
Print a brief help message and exits.
--host, --port, --database, --user, --password
See mysql cli help for more information on those parameters.
--exclude=[!]name
Exclude from the running thread list queries matching the argument. This parameter can be repeated several times to exclude different kinds of queries. If you prefix the argument with an exclamation mark (!), all thread not matching this argument will be excluded. Allowed parameters are:
select, insert, replace, update, delete, create, drop, alter
Exclude SQL query which command is of the same name.
write
Exclude every SQL query doing write operation (insert, replace, update, delete).
other
Exclude SQL query which are none of the above type.
sleep
Exclude all sleeping threads
system
Exclude thread ran by the system (often used for replication threads)
user=<user>
Exclude threads ran by given mysql username.
db=<db>
Exclude threads using given database.
state=<state>
Exclude threads in given state.
See <http://dev.mysql.com/doc/refman/5.0/en/general-thread-states.html> for the list of possible states
command=<command>
Exclude threads using given command.
See <http://dev.mysql.com/doc/refman/5.0/en/thread-commands.html> for the list of possible commands.
--selects-only
This is equivalent to: --exclude=write --exclude=other --exclude=sleep --exclude=system.
--min-time=#
Exclude queries with execution time lower than given parameter.
--timeout
Keep only queries with a timeout provided and with an execution time which exceeded this timeout. The timeout can be provided with the query in a comment like this:
  SELECT /* timeout:40 */ * FROM table;
    
Timeout is expressed in second.
--limit=#
Take first # threads and excludes others.
--placeholder
Will try to make queries more generic by replacing all values by either "i" for numbers or "s" for strings.
--distinct
Keep only the first query from group of identical queries and exlude others.
Note: If you use this option with --placeholder, queries that would differ only by values used will become identical. This is useful to distinct big type of queries.
--sort[=name]
Sort matched queries by parameter given as argument.
Allowed parameters are as follow:
concurrency or c
Sort queries by most repeated ones.
time or t
Sort queries by longer execution time.
--list[=template]
Output the result to the terminal.
The default output format can be changed by supplying a template with desired field.
Available fields are: Id, User, Command, State, Db, Host, Time, Info, Group, Concurrency, QType, Timeout
Default template is: <Id> <User> <Db> <Time> <Info>
--kill
Kill every threads that match the given filters.
--stats
Show statistics about queries matched by filters.
--interval[=#]
Repeat the command at regular interval. Interval in second can be specified as argument. If not specified, default interval is 5 seconds.

mysql-genocide helps you play with big MySQL processlists. It can filter it using different criterias like execution time, query type, user or regexp matching of the SQL query etc. Actions can then be peformed on the result like killing, sorting or generating statistics.

Kill all selects with execution time geater than 60 seconds:
    mysql-genocide --selects-only --min-time 60 --kill
Same as before but limited on queries matching a pattern:
    mysql-genocide -s -t 60 -K 'FROM user '
Kill all queries timed out:
    mysql-genocide --timeout --kill
Replace queries values by placeholders and group identical queries together, sort them by most concurrent and keep only the 10 most concurent ones:
    mysql-genocide --placeholder --group --sort concurrency --limit 10 --list

You can add some information in your SQL queries to help mysql-genocide to do some decisions. To pass this kind of information, you can use SQL comments like this:
  /* VARIABLE[:VALUE] */ SELECT * FROM...
NOTE: in certain versions of mysql CLI client strip comments before to send them to the server.
AVAILABLE EXTENDED INFO
TIMEOUT:SECONDS
This option hint "mysql-genocide" on the maximum execution time the query should take. The option --timeout will keep only queries with an execution time which exceeded this value.
The timeout can be provided with the query in a comment like this:
  /* timeout:40 */ SELECT * FROM table;
    
Timeout is expressed in second.
DO_NOT_KILL
If this option is present in query, the query won't be killed when --kill option is used, even if it match the filters. If you combine --list and --kill on the same command, such queries will appear in the listed queries but won't be killed.
Example query:
  /* DO_NOT_KILL */ SELECT * FROM important_data;
    

Unix/System_administration

This script requires the "DBD::mysql", "Getopt::Long" and "Pod::Usage" modules.

any

Olivier Poitrey <rs@dailymotion.com>
2008-06-14 perl v5.28.1

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