myisam_ftdump(1) — Linux manual page


MYISAM_FTDUMP(1)         MariaDB Database System        MYISAM_FTDUMP(1)

NAME         top

       myisam_ftdump - display full-text index information

SYNOPSIS         top

       myisam_ftdump [options] tbl_name index_num

DESCRIPTION         top

       myisam_ftdump displays information about FULLTEXT indexes in
       MyISAM tables. It reads the MyISAM index file directly, so it
       must be run on the server host where the table is located. Before
       using myisam_ftdump, be sure to issue a FLUSH TABLES statement
       first if the server is running.

       myisam_ftdump scans and dumps the entire index, which is not
       particularly fast. On the other hand, the distribution of words
       changes infrequently, so it need not be run often.

       Invoke myisam_ftdump like this:

           shell> myisam_ftdump [options] tbl_name index_num

       The tbl_name argument should be the name of a MyISAM table. You
       can also specify a table by naming its index file (the file with
       the .MYI suffix). If you do not invoke myisam_ftdump in the
       directory where the table files are located, the table or index
       file name must be preceded by the path name to the table´s
       database directory. Index numbers begin with 0.

       Example: Suppose that the test database contains a table named
       mytexttablel that has the following definition:

           CREATE TABLE mytexttable
             id   INT NOT NULL,
             txt  TEXT NOT NULL,
             PRIMARY KEY (id),
             FULLTEXT (txt)

       The index on id is index 0 and the FULLTEXT index on txt is index
       1. If your working directory is the test database directory,
       invoke myisam_ftdump as follows:

           shell> myisam_ftdump mytexttable 1

       If the path name to the test database directory is
       /usr/local/mysql/data/test, you can also specify the table name
       argument using that path name. This is useful if you do not
       invoke myisam_ftdump in the database directory:

           shell> myisam_ftdump /usr/local/mysql/data/test/mytexttable 1

       You can use myisam_ftdump to generate a list of index entries in
       order of frequency of occurrence like this:

           shell> myisam_ftdump -c mytexttable 1 | sort -r

       myisam_ftdump supports the following options:

       •   --help, -h -?

           Display a help message and exit.

       •   --count, -c

           Calculate per-word statistics (counts and global weights).

       •   --dump, -d

           Dump the index, including data offsets and word weights.

       •   --length, -l

           Report the length distribution.

       •   --stats, -s

           Report global index statistics. This is the default operation
           if no other operation is specified.

       •   --verbose, -v

           Verbose mode. Print more output about what the program does.

COPYRIGHT         top

       Copyright 2007-2008 MySQL AB, 2008-2010 Sun Microsystems, Inc.,
       2010-2020 MariaDB Foundation

       This documentation is free software; you can redistribute it
       and/or modify it only under the terms of the GNU General Public
       License as published by the Free Software Foundation; version 2
       of the License.

       This documentation is distributed in the hope that it will be
       useful, but WITHOUT ANY WARRANTY; without even the implied
       See the GNU General Public License for more details.

       You should have received a copy of the GNU General Public License
       along with the program; if not, write to the Free Software
       Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
       02110-1335 USA or see

SEE ALSO         top

       For more information, please refer to the MariaDB Knowledge Base,
       available online at

AUTHOR         top

       MariaDB Foundation (

COLOPHON         top

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MariaDB 10.8                   15 May 2020              MYISAM_FTDUMP(1)

Pages that refer to this page: aria_ftdump(1)