myisam_ftdump

myisam_ftdump is a utility for displaying information about MyISAM FULLTEXT indexes. It will scan and dump the entire index, and can be a lengthy process.

If the server is running, make sure you run a FLUSH TABLES statement first.

Usage

myisam_ftdump <table_name> <index_num>

The table_name can be specified with or without the .MYI index extension.

The index number refers to the number of the index when the table was defined, starting at zero. For example, take the following table definition:

CREATE TABLE IF NOT EXISTS `employees_example` (
  `id` INT(11) NOT NULL AUTO_INCREMENT,
  `first_name` VARCHAR(30) NOT NULL,
  `last_name` VARCHAR(40) NOT NULL,
  `position` VARCHAR(25) NOT NULL,
  `home_address` VARCHAR(50) NOT NULL,
  `home_phone` VARCHAR(12) NOT NULL,
  `employee_code` VARCHAR(25) NOT NULL,
  `bio` text NOT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `employee_code` (`employee_code`),
  FULLTEXT (`bio`)
) ENGINE=MyISAM;

The fulltext index is 2. The primary key is index 0, and the unique key index 1.

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

myisam_ftdump -c mytexttable 1 | sort -r

Options

Option	Description
-h, --help	Display help and exit.
-?, --help	Synonym for -h.
-c, --count	Calculate per-word stats (counts and global weights).
-d, --dump	Dump index (incl. data offsets and word weights).
-l, --length	Report length distribution.
-s, --stats	Report global stats.
-v, --verbose	Be verbose.

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