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Updated: July 2014

myisam_ftdump (1)


myisam_ftdump - text index information


myisam_ftdump [options] tbl_name index_num


MySQL Database System                            MYISAM_FTDUMP(1)

     myisam_ftdump - display full-text index information

     myisam_ftdump [options] tbl_name index_num

     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 mytexttable that has the following definition:

         CREATE TABLE mytexttable
           id   INT NOT NULL,
           txt  TEXT NOT NULL,
           PRIMARY KEY (id),
           FULLTEXT (txt)
         ) ENGINE=MyISAM;

     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

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     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:

     o   --help, -h -?

         Display a help message and exit.

     o   --count, -c

         Calculate per-word statistics (counts and global

     o   --dump, -d

         Dump the index, including data offsets and word weights.

     o   --length, -l

         Report the length distribution.

     o   --stats, -s

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

     o   --verbose, -v

         Verbose mode. Print more output about what the program

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MySQL Database System                            MYISAM_FTDUMP(1)

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MySQL Database System                            MYISAM_FTDUMP(1)

     |Availability   | database/mysql-55 |
     |Stability      | Uncommitted       |
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