README

NAME
    mysql-genocide - Parallel operation on MySQL processlist

SYNOPSIS
    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

OPTIONS
    --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.ht
            ml> 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.

DESCRIPTION
    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.

EXAMPLES
    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

SCRIPT CATEGORIES
    Unix/System_administration

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

OSNAMES
    any

AUTHOR
    Olivier Poitrey <rs@dailymotion.com>