This section describes how to use mysqldump to create delimited-text dump files. For information about reloading such dump files, see Section 7.4.4, “Reloading Delimited-Text Format Backups”.
If you invoke mysqldump with the
option, it uses
dir_name as the
output directory and dumps tables individually in that directory
using two files for each table. The table name is the base name
for these files. For a table named
files are named
CREATE TABLE statement
for the table. The
.txt file contains the
table data, one line per table row.
The following command dumps the contents of the
db1 database to files in the
$> mysqldump --tab=/tmp db1
.txt files containing table data are
written by the server, so they are owned by the system account
used for running the server. The server uses
SELECT ... INTO
OUTFILE to write the files, so you must have the
FILE privilege to perform this
operation, and an error occurs if a given
.txt file already exists.
The server sends the
CREATE definitions for
dumped tables to mysqldump, which writes them
.sql files. These files therefore are
owned by the user who executes mysqldump.
It is best that
--tab be used
only for dumping a local server. If you use it with a remote
must exist on both the local and remote hosts, and the
.txt files are written by the server in the
remote directory (on the server host), whereas the
.sql files are written by
mysqldump in the local directory (on the
For mysqldump --tab, the server by default
writes table data to
.txt files one line
per row with tabs between column values, no quotation marks
around column values, and newline as the line terminator. (These
are the same defaults as for
SELECT ... INTO
To enable data files to be written using a different format, mysqldump supports these options:
The string for separating column values (default: tab).
The character within which to enclose column values (default: no character).
The character within which to enclose non-numeric column values (default: no character).
The character for escaping special characters (default: no escaping).
The line-termination string (default: newline).
Depending on the value you specify for any of these options, it
might be necessary on the command line to quote or escape the
value appropriately for your command interpreter. Alternatively,
specify the value using hex notation. Suppose that you want
mysqldump to quote column values within
double quotation marks. To do so, specify double quote as the
value for the
option. But this character is often special to command
interpreters and must be treated specially. For example, on
Unix, you can quote the double quote like this:
On any platform, you can specify the value in hex:
It is common to use several of the data-formatting options
together. For example, to dump tables in comma-separated values
format with lines terminated by carriage-return/newline pairs
\r\n), use this command (enter it on a
$> mysqldump --tab=/tmp --fields-terminated-by=, --fields-enclosed-by='"' --lines-terminated-by=0x0d0a db1
Should you use any of the data-formatting options to dump table data, you need to specify the same format when you reload data files later, to ensure proper interpretation of the file contents.