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:
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:
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:
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 on Unix-like systems:
myisam_ftdump -c mytexttable 1 | sort -r
On Windows, use:
myisam_ftdump -c mytexttable 1 | sort /R
myisam_ftdump supports the following options:
--help
,-h
-?
Command-Line Format --help
Display a help message and exit.
--count
,-c
Command-Line Format --count
Calculate per-word statistics (counts and global weights).
--dump
,-d
Command-Line Format --dump
Dump the index, including data offsets and word weights.
--length
,-l
Command-Line Format --length
Report the length distribution.
--stats
,-s
Command-Line Format --stats
Report global index statistics. This is the default operation if no other operation is specified.
--verbose
,-v
Command-Line Format --verbose
Verbose mode. Print more output about what the program does.