Unix/Linux Go Back    

CentOS 7.0 - man page for mysqldump (centos section 1)

Linux & Unix Commands - Search Man Pages
Man Page or Keyword Search:   man
Select Man Page Set:       apropos Keyword Search (sections above)

MYSQLDUMP(1)			      MySQL Database System			     MYSQLDUMP(1)

       mysqldump - a database backup program

       mysqldump [options] [db_name [tbl_name ...]]

       The mysqldump client is a backup program originally written by Igor Romanenko. It can be
       used to dump a database or a collection of databases for backup or transfer to another SQL
       server (not necessarily a MySQL server). The dump typically contains SQL statements to
       create the table, populate it, or both. However, mysqldump can also be used to generate
       files in CSV, other delimited text, or XML format.

       If you are doing a backup on the server and your tables all are MyISAM tables, consider
       using the mysqlhotcopy instead because it can accomplish faster backups and faster
       restores. See mysqlhotcopy(1).

       There are three general ways to invoke mysqldump:

	   shell> mysqldump [options] db_name [tbl_name ...]
	   shell> mysqldump [options] --databases db_name ...
	   shell> mysqldump [options] --all-databases

       If you do not name any tables following db_name or if you use the --databases or
       --all-databases option, entire databases are dumped.

       mysqldump does not dump the INFORMATION_SCHEMA database by default. As of MySQL 5.1.38,
       mysqldump dumps INFORMATION_SCHEMA if you name it explicitly on the command line, although
       currently you must also use the --skip-lock-tables option. Before 5.1.38, mysqldump
       silently ignores INFORMATION_SCHEMA even if you name it explicitly on the command line.

       To see a list of the options your version of mysqldump supports, execute mysqldump --help.

       Some mysqldump options are shorthand for groups of other options:

       o   Use of --opt is the same as specifying --add-drop-table, --add-locks,
	   --create-options, --disable-keys, --extended-insert, --lock-tables, --quick, and
	   --set-charset. All of the options that --opt stands for also are on by default because
	   --opt is on by default.

       o   Use of --compact is the same as specifying --skip-add-drop-table, --skip-add-locks,
	   --skip-comments, --skip-disable-keys, and --skip-set-charset options.

       To reverse the effect of a group option, uses its --skip-xxx form (--skip-opt or
       --skip-compact). It is also possible to select only part of the effect of a group option
       by following it with options that enable or disable specific features. Here are some

       o   To select the effect of --opt except for some features, use the --skip option for each
	   feature. To disable extended inserts and memory buffering, use --opt
	   --skip-extended-insert --skip-quick. (Actually, --skip-extended-insert --skip-quick is
	   sufficient because --opt is on by default.)

       o   To reverse --opt for all features except index disabling and table locking, use
	   --skip-opt --disable-keys --lock-tables.

       When you selectively enable or disable the effect of a group option, order is important
       because options are processed first to last. For example, --disable-keys --lock-tables
       --skip-opt would not have the intended effect; it is the same as --skip-opt by itself.

       mysqldump can retrieve and dump table contents row by row, or it can retrieve the entire
       content from a table and buffer it in memory before dumping it. Buffering in memory can be
       a problem if you are dumping large tables. To dump tables row by row, use the --quick
       option (or --opt, which enables --quick). The --opt option (and hence --quick) is enabled
       by default, so to enable memory buffering, use --skip-quick.

       If you are using a recent version of mysqldump to generate a dump to be reloaded into a
       very old MySQL server, you should not use the --opt or --extended-insert option. Use
       --skip-opt instead.

	   mysqldump from MySQL 5.1.21 cannot be used to create dumps from MySQL server 5.1.20
	   and older. This issue is fixed in MySQL 5.1.22. (Bug#30123[1])

       mysqldump supports the following options, which can be specified on the command line or in
       the [mysqldump] and [client] option file groups.  mysqldump also supports the options for
       processing option files described at Section, "Command-Line Options that Affect
       Option-File Handling".

       o   --help, -?

	   Display a help message and exit.

       o   --add-drop-database

	   Add a DROP DATABASE statement before each CREATE DATABASE statement. This option is
	   typically used in conjunction with the --all-databases or --databases option because
	   no CREATE DATABASE statements are written unless one of those options is specified.

       o   --add-drop-table

	   Add a DROP TABLE statement before each CREATE TABLE statement.

       o   --add-locks

	   Surround each table dump with LOCK TABLES and UNLOCK TABLES statements. This results
	   in faster inserts when the dump file is reloaded. See Section 7.2.21, "Speed of INSERT

       o   --all-databases, -A

	   Dump all tables in all databases. This is the same as using the --databases option and
	   naming all the databases on the command line.

       o   --all-tablespaces, -Y

	   Adds to a table dump all SQL statements needed to create any tablespaces used by an
	   NDBCLUSTER table. This information is not otherwise included in the output from
	   mysqldump. This option is currently relevant only to MySQL Cluster tables.

	   This option was added in MySQL 5.1.6.

       o   --allow-keywords

	   Allow creation of column names that are keywords. This works by prefixing each column
	   name with the table name.

       o   --character-sets-dir=path

	   The directory where character sets are installed. See Section 9.5, "Character Set

       o   --comments, -i

	   Write additional information in the dump file such as program version, server version,
	   and host. This option is enabled by default. To suppress this additional information,
	   use --skip-comments.

       o   --compact

	   Produce more compact output. This option enables the --skip-add-drop-table,
	   --skip-add-locks, --skip-comments, --skip-disable-keys, and --skip-set-charset

	       Prior to MySQL 5.1.21, this option did not create valid SQL if the database dump
	       contained views. The recreation of views requires the creation and removal of
	       temporary tables and this option suppressed the removal of those temporary tables.
	       As a workaround, use --compact with the --add-drop-table option and then manually
	       adjust the dump file.

       o   --compatible=name

	   Produce output that is more compatible with other database systems or with older MySQL
	   servers. The value of name can be ansi, mysql323, mysql40, postgresql, oracle, mssql,
	   db2, maxdb, no_key_options, no_table_options, or no_field_options. To use several
	   values, separate them by commas. These values have the same meaning as the
	   corresponding options for setting the server SQL mode. See Section 5.1.8, "Server SQL

	   This option does not guarantee compatibility with other servers. It only enables those
	   SQL mode values that are currently available for making dump output more compatible.
	   For example, --compatible=oracle does not map data types to Oracle types or use Oracle
	   comment syntax.

	   This option requires a server version of 4.1.0 or higher. With older servers, it does

       o   --complete-insert, -c

	   Use complete INSERT statements that include column names.

       o   --compress, -C

	   Compress all information sent between the client and the server if both support

       o   --create-options, -a

	   Include all MySQL-specific table options in the CREATE TABLE statements.

       o   --databases, -B

	   Dump several databases. Normally, mysqldump treats the first name argument on the
	   command line as a database name and following names as table names. With this option,
	   it treats all name arguments as database names.  CREATE DATABASE and USE statements
	   are included in the output before each new database.

       o   --debug[=debug_options], -# [debug_options]

	   Write a debugging log. A typical debug_options string is 'd:t:o,file_name'. The
	   default value is 'd:t:o,/tmp/mysqldump.trace'.

       o   --debug-check

	   Print some debugging information when the program exits. This option was added in
	   MySQL 5.1.21.

       o   --debug-info

	   Print debugging information and memory and CPU usage statistics when the program
	   exits. This option was added in MySQL 5.1.14.

       o   --default-character-set=charset_name

	   Use charset_name as the default character set. See Section 9.5, "Character Set
	   Configuration". If no character set is specified, mysqldump uses utf8, and earlier
	   versions use latin1.

	   Prior to MySQL 5.1.38, this option has no effect for output data files produced by
	   using the --tab option. See the description for that option.

       o   --defaults-extra-file=filename

	   Set filename as the file to read default options from after the global defaults files
	   has been read.  Must be given as first option.

       o   --defaults-file=filename

	   Set filename as the file to read default options from, override global defaults files.
	   Must be given as first option.

       o   --delayed-insert

	   Write INSERT DELAYED statements rather than INSERT statements.

       o   --delete-master-logs

	   On a master replication server, delete the binary logs by sending a PURGE BINARY LOGS
	   statement to the server after performing the dump operation. This option automatically
	   enables --master-data.

       o   --disable-keys, -K

	   For each table, surround the INSERT statements with /*!40000 ALTER TABLE tbl_name
	   DISABLE KEYS */; and /*!40000 ALTER TABLE tbl_name ENABLE KEYS */; statements. This
	   makes loading the dump file faster because the indexes are created after all rows are
	   inserted. This option is effective only for nonunique indexes of MyISAM tables.

       o   --dump-date

	   If the --comments option is given, mysqldump produces a comment at the end of the dump
	   of the following form:

	       -- Dump completed on DATE

	   However, the date causes dump files taken at different times to appear to be
	   different, even if the data are otherwise identical.  --dump-date and --skip-dump-date
	   control whether the date is added to the comment. The default is --dump-date (include
	   the date in the comment).  --skip-dump-date suppresses date printing. This option was
	   added in MySQL 5.1.23.

       o   --events, -E

	   Include Event Scheduler events for the dumped databases in the output. This option was
	   added in MySQL 5.1.8.

       o   --extended-insert, -e

	   Use multiple-row INSERT syntax that include several VALUES lists. This results in a
	   smaller dump file and speeds up inserts when the file is reloaded.

       o   --fields-terminated-by=..., --fields-enclosed-by=...,
	   --fields-optionally-enclosed-by=..., --fields-escaped-by=...

	   These options are used with the --tab option and have the same meaning as the
	   corresponding FIELDS clauses for LOAD DATA INFILE. See Section 12.2.6, "LOAD DATA
	   INFILE Syntax".

       o   --first-slave

	   Deprecated. Use --lock-all-tables instead.  --first-slave is removed in MySQL 5.5.

       o   --flush-logs, -F

	   Flush the MySQL server log files before starting the dump. This option requires the
	   RELOAD privilege. If you use this option in combination with the --all-databases
	   option, the logs are flushed for each database dumped. The exception is when using
	   --lock-all-tables or --master-data: In this case, the logs are flushed only once,
	   corresponding to the moment that all tables are locked. If you want your dump and the
	   log flush to happen at exactly the same moment, you should use --flush-logs together
	   with either --lock-all-tables or --master-data.

       o   --flush-privileges

	   Send a FLUSH PRIVILEGES statement to the server after dumping the mysql database. This
	   option should be used any time the dump contains the mysql database and any other
	   database that depends on the data in the mysql database for proper restoration. This
	   option was added in MySQL 5.1.12.

       o   --force, -f

	   Continue even if an SQL error occurs during a table dump.

	   One use for this option is to cause mysqldump to continue executing even when it
	   encounters a view that has become invalid because the definition refers to a table
	   that has been dropped. Without --force, mysqldump exits with an error message. With
	   --force, mysqldump prints the error message, but it also writes an SQL comment
	   containing the view definition to the dump output and continues executing.

       o   --host=host_name, -h host_name

	   Dump data from the MySQL server on the given host. The default host is localhost.

       o   --hex-blob

	   Dump binary columns using hexadecimal notation (for example, 'abc' becomes 0x616263).
	   The affected data types are BINARY, VARBINARY, the BLOB types, and BIT.

       o   --ignore-table=db_name.tbl_name

	   Do not dump the given table, which must be specified using both the database and table
	   names. To ignore multiple tables, use this option multiple times. This option also can
	   be used to ignore views.

       o   --insert-ignore

	   Write INSERT IGNORE statements rather than INSERT statements.

       o   --lines-terminated-by=...

	   This option is used with the --tab option and has the same meaning as the
	   corresponding LINES clause for LOAD DATA INFILE. See Section 12.2.6, "LOAD DATA INFILE

       o   --lock-all-tables, -x

	   Lock all tables across all databases. This is achieved by acquiring a global read lock
	   for the duration of the whole dump. This option automatically turns off
	   --single-transaction and --lock-tables.

       o   --lock-tables, -l

	   For each dumped database, lock all tables to be dumped before dumping them. The tables
	   are locked with READ LOCAL to allow concurrent inserts in the case of MyISAM tables.
	   For transactional tables such as InnoDB, --single-transaction is a much better option
	   than --lock-tables because it does not need to lock the tables at all.

	   Because --lock-tables locks tables for each database separately, this option does not
	   guarantee that the tables in the dump file are logically consistent between databases.
	   Tables in different databases may be dumped in completely different states.

       o   --log-error=file_name

	   Log warnings and errors by appending them to the named file. The default is to do no
	   logging. This option was added in MySQL 5.1.18.

       o   --master-data[=value]

	   Use this option to dump a master replication server to produce a dump file that can be
	   used to set up another server as a slave of the master. It causes the dump output to
	   include a CHANGE MASTER TO statement that indicates the binary log coordinates (file
	   name and position) of the dumped server. These are the master server coordinates from
	   which the slave should start replicating after you load the dump file into the slave.

	   If the option value is 2, the CHANGE MASTER TO statement is written as an SQL comment,
	   and thus is informative only; it has no effect when the dump file is reloaded. If the
	   option value is 1, the statement is not written as a comment and takes effect when the
	   dump file is reloaded. If no option value is specified, the default value is 1.

	   This option requires the RELOAD privilege and the binary log must be enabled.

	   The --master-data option automatically turns off --lock-tables. It also turns on
	   --lock-all-tables, unless --single-transaction also is specified, in which case, a
	   global read lock is acquired only for a short time at the beginning of the dump (see
	   the description for --single-transaction). In all cases, any action on logs happens at
	   the exact moment of the dump.

	   It is also possible to set up a slave by dumping an existing slave of the master. To
	   do this, use the following procedure on the existing slave:

	    1. Stop the slave's SQL thread and get its current status:

		   mysql> SHOW SLAVE STATUS;

	    2. From the output of the SHOW SLAVE STATUS statement, the binary log coordinates of
	       the master server from which the new slave should start replicating are the values
	       of the Relay_Master_Log_File and Exec_Master_Log_Pos fields. Denote those values
	       as file_name and file_pos.

	    3. Dump the slave server:

		   shell> mysqldump --master-data=2 --all-databases > dumpfile

	    4. Restart the slave:

		   mysql> START SLAVE;

	    5. On the new slave, load the dump file:

		   shell> mysql < dumpfile

	    6. On the new slave, set the replication coordinates to those of the master server
	       obtained earlier:

		   mysql> CHANGE MASTER TO
		       -> MASTER_LOG_FILE = 'file_name', MASTER_LOG_POS = file_pos;

	       The CHANGE MASTER TO statement might also need other parameters, such as
	       MASTER_HOST to point the slave to the correct master server host. Add any such
	       parameters as necessary.

       o   --max-allowed-packet=length

	   Sets the maximum packet length to send to or recieve from server.

       o   --net-buffer-length=length

	   Sets the buffer size for TCP/IP and socket communication.

       o   --no-autocommit

	   Enclose the INSERT statements for each dumped table within SET autocommit = 0 and
	   COMMIT statements.

       o   --no-create-db, -n

	   This option suppresses the CREATE DATABASE statements that are otherwise included in
	   the output if the --databases or --all-databases option is given.

       o   --no-create-info, -t

	   Do not write CREATE TABLE statements that re-create each dumped table.

       o   --no-data, -d

	   Do not write any table row information (that is, do not dump table contents). This is
	   useful if you want to dump only the CREATE TABLE statement for the table (for example,
	   to create an empty copy of the table by loading the dump file).

       o   --no-defaults

	   Do not read default options from any option file. This must be given as the first

       o   --no-set-names, -N

	   This has the same effect as --skip-set-charset.

       o   --opt

	   This option is shorthand. It is the same as specifying --add-drop-table --add-locks
	   --create-options --disable-keys --extended-insert --lock-tables --quick --set-charset.
	   It should give you a fast dump operation and produce a dump file that can be reloaded
	   into a MySQL server quickly.

	   The --opt option is enabled by default. Use --skip-opt to disable it.  See the
	   discussion at the beginning of this section for information about selectively enabling
	   or disabling a subset of the options affected by --opt.

       o   --order-by-primary

	   Dump each table's rows sorted by its primary key, or by its first unique index, if
	   such an index exists. This is useful when dumping a MyISAM table to be loaded into an
	   InnoDB table, but will make the dump operation take considerably longer.

       o   --password[=password], -p[password]

	   The password to use when connecting to the server. If you use the short option form
	   (-p), you cannot have a space between the option and the password. If you omit the
	   password value following the --password or -p option on the command line, mysqldump
	   prompts for one.

	   Specifying a password on the command line should be considered insecure. See
	   Section, "End-User Guidelines for Password Security". You can use an option
	   file to avoid giving the password on the command line.

       o   --pipe, -W

	   On Windows, connect to the server via a named pipe. This option applies only if the
	   server supports named-pipe connections.

       o   --port=port_num, -P port_num

	   The TCP/IP port number to use for the connection.

       o   --protocol={TCP|SOCKET|PIPE|MEMORY}

	   The connection protocol to use for connecting to the server. It is useful when the
	   other connection parameters normally would cause a protocol to be used other than the
	   one you want. For details on the allowable values, see Section 4.2.2, "Connecting to
	   the MySQL Server".

       o   --quick, -q

	   This option is useful for dumping large tables. It forces mysqldump to retrieve rows
	   for a table from the server a row at a time rather than retrieving the entire row set
	   and buffering it in memory before writing it out.

       o   --print-defaults

	   Print the program argument list and exit. This must begiven as the first argument.

       o   --quote-names, -Q

	   Quote identifiers (such as database, table, and column names) within "`" characters.
	   If the ANSI_QUOTES SQL mode is enabled, identifiers are quoted within """ characters.
	   This option is enabled by default. It can be disabled with --skip-quote-names, but
	   this option should be given after any option such as --compatible that may enable

       o   --replace

	   Write REPLACE statements rather than INSERT statements. This option was added in MySQL

       o   --result-file=file_name, -r file_name

	   Direct output to a given file. This option should be used on Windows to prevent
	   newline "\n" characters from being converted to "\r\n" carriage return/newline
	   sequences. The result file is created and its previous contents overwritten, even if
	   an error occurs while generating the dump.

       o   --routines, -R

	   Included stored routines (procedures and functions) for the dumped databases in the
	   output. Use of this option requires the SELECT privilege for the mysql.proc table. The
	   output generated by using --routines contains CREATE PROCEDURE and CREATE FUNCTION
	   statements to re-create the routines. However, these statements do not include
	   attributes such as the routine creation and modification timestamps. This means that
	   when the routines are reloaded, they will be created with the timestamps equal to the
	   reload time.

	   If you require routines to be re-created with their original timestamp attributes, do
	   not use --routines. Instead, dump and reload the contents of the mysql.proc table
	   directly, using a MySQL account that has appropriate privileges for the mysql

	   This option was added in MySQL 5.1.2. Before that, stored routines are not dumped.
	   Routine DEFINER values are not dumped until MySQL 5.1.8. This means that before 5.1.8,
	   when routines are reloaded, they will be created with the definer set to the reloading
	   user. If you require routines to be re-created with their original definer, dump and
	   load the contents of the mysql.proc table directly as described earlier.

       o   --set-charset

	   Add SET NAMES default_character_set to the output. This option is enabled by default.
	   To suppress the SET NAMES statement, use --skip-set-charset.

       o   --single-transaction

	   This option sends a START TRANSACTION SQL statement to the server before dumping data.
	   It is useful only with transactional tables such as InnoDB, because then it dumps the
	   consistent state of the database at the time when BEGIN was issued without blocking
	   any applications.

	   When using this option, you should keep in mind that only InnoDB tables are dumped in
	   a consistent state. For example, any MyISAM or MEMORY tables dumped while using this
	   option may still change state.

	   While a --single-transaction dump is in process, to ensure a valid dump file (correct
	   table contents and binary log coordinates), no other connection should use the
	   TABLE. A consistent read is not isolated from those statements, so use of them on a
	   table to be dumped can cause the SELECT that is performed by mysqldump to retrieve the
	   table contents to obtain incorrect contents or fail.

	   The --single-transaction option and the --lock-tables option are mutually exclusive
	   because LOCK TABLES causes any pending transactions to be committed implicitly.

	   This option is not supported for MySQL Cluster tables; the results cannot be
	   guaranteed to be consistent due to the fact that the NDBCLUSTER storage engine
	   supports only the READ_COMMITTED transaction isolation level. You should always use
	   NDB backup and restore instead.

	   To dump large tables, you should combine the --single-transaction option with --quick.

       o   --skip-comments

	   See the description for the --comments option.

       o   --skip-opt

	   See the description for the --opt option.

       o   --socket=path, -S path

	   For connections to localhost, the Unix socket file to use, or, on Windows, the name of
	   the named pipe to use.

       o   --ssl*

	   Options that begin with --ssl specify whether to connect to the server via SSL and
	   indicate where to find SSL keys and certificates. See Section, "SSL Command

       o   --tab=path, -T path

	   Produce tab-separated text-format data files. For each dumped table, mysqldump creates
	   a tbl_name.sql file that contains the CREATE TABLE statement that creates the table,
	   and the server writes a tbl_name.txt file that contains its data. The option value is
	   the directory in which to write the files.

	       This option should be used only when mysqldump is run on the same machine as the
	       mysqld server. You must have the FILE privilege, and the server must have
	       permission to write files in the directory that you specify.
	   By default, the .txt data files are formatted using tab characters between column
	   values and a newline at the end of each line. The format can be specified explicitly
	   using the --fields-xxx and --lines-terminated-by options.

	   As of MySQL 5.1.38, column values are converted to the character set specified by the
	   --default-character-set option. Prior to 5.1.38 or if no such option is present,
	   values are dumped using the binary character set. In effect, there is no character set
	   conversion. If a table contains columns in several character sets, the output data
	   file will as well and you may not be able to reload the file correctly.

       o   --tables

	   Override the --databases or -B option.  mysqldump regards all name arguments following
	   the option as table names.

       o   --triggers

	   Include triggers for each dumped table in the output. This option is enabled by
	   default; disable it with --skip-triggers.

       o   --tz-utc

	   This option enables TIMESTAMP columns to be dumped and reloaded between servers in
	   different time zones.  mysqldump sets its connection time zone to UTC and adds SET
	   TIME_ZONE='+00:00' to the dump file. Without this option, TIMESTAMP columns are dumped
	   and reloaded in the time zones local to the source and destination servers, which can
	   cause the values to change if the servers are in different time zones.  --tz-utc also
	   protects against changes due to daylight saving time.  --tz-utc is enabled by default.
	   To disable it, use --skip-tz-utc. This option was added in MySQL 5.1.2.

       o   --user=user_name, -u user_name

	   The MySQL user name to use when connecting to the server.

       o   --verbose, -v

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

       o   --version, -V

	   Display version information and exit.

       o   --where='where_condition', -w 'where_condition'

	   Dump only rows selected by the given WHERE condition. Quotes around the condition are
	   mandatory if it contains spaces or other characters that are special to your command



       o   --xml, -X

	   Write dump output as well-formed XML.

	   NULL, 'NULL', and Empty Values: For a column named column_name, the NULL value, an
	   empty string, and the string value 'NULL' are distinguished from one another in the
	   output generated by this option as follows.

	   |Value:		  | XML Representation: 	    |
	   |NULL (unknown value)  | <field name="column_name"	    |
	   |			  | xsi:nil="true" />		    |
	   |'' (empty string)	  | <field			    |
	   |			  | name="column_name"></field>     |
	   |'NULL' (string value) | <field			    |
	   |			  | name="column_name">NULL</field> |
	   Beginning with MySQL 5.1.12, the output from the mysql client when run using the --xml
	   option also follows the preceding rules. (See the section called "MYSQL OPTIONS".)

	   Beginning with MySQL 5.1.18, XML output from mysqldump includes the XML namespace, as
	   shown here:

	       shell> mysqldump --xml -u root world City
	       <?xml version="1.0"?>
	       <mysqldump xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
	       <database name="world">
	       <table_structure name="City">
	       <field Field="ID" Type="int(11)" Null="NO" Key="PRI" Extra="auto_increment" />
	       <field Field="Name" Type="char(35)" Null="NO" Key="" Default="" Extra="" />
	       <field Field="CountryCode" Type="char(3)" Null="NO" Key="" Default="" Extra="" />
	       <field Field="District" Type="char(20)" Null="NO" Key="" Default="" Extra="" />
	       <field Field="Population" Type="int(11)" Null="NO" Key="" Default="0" Extra="" />
	       <key Table="City" Non_unique="0" Key_name="PRIMARY" Seq_in_index="1" Column_name="ID"
	       Collation="A" Cardinality="4079" Null="" Index_type="BTREE" Comment="" />
	       <options Name="City" Engine="MyISAM" Version="10" Row_format="Fixed" Rows="4079"
	       Avg_row_length="67" Data_length="273293" Max_data_length="18858823439613951"
	       Index_length="43008" Data_free="0" Auto_increment="4080"
	       Create_time="2007-03-31 01:47:01" Update_time="2007-03-31 01:47:02"
	       Collation="latin1_swedish_ci" Create_options="" Comment="" />
	       <table_data name="City">
	       <field name="ID">1</field>
	       <field name="Name">Kabul</field>
	       <field name="CountryCode">AFG</field>
	       <field name="District">Kabol</field>
	       <field name="Population">1780000</field>
	       <field name="ID">4079</field>
	       <field name="Name">Rafah</field>
	       <field name="CountryCode">PSE</field>
	       <field name="District">Rafah</field>
	       <field name="Population">92020</field>

       You can also set the following variables by using --var_name=value syntax:

       o   max_allowed_packet

	   The maximum size of the buffer for client/server communication. The maximum is 1GB.

       o   net_buffer_length

	   The initial size of the buffer for client/server communication. When creating
	   multiple-row INSERT statements (as with the --extended-insert or --opt option),
	   mysqldump creates rows up to net_buffer_length length. If you increase this variable,
	   you should also ensure that the net_buffer_length variable in the MySQL server is at
	   least this large.

       A common use of mysqldump is for making a backup of an entire database:

	   shell> mysqldump db_name > backup-file.sql

       You can load the dump file back into the server like this:

	   shell> mysql db_name < backup-file.sql

       Or like this:

	   shell> mysql -e "source /path-to-backup/backup-file.sql" db_name

       mysqldump is also very useful for populating databases by copying data from one MySQL
       server to another:

	   shell> mysqldump --opt db_name | mysql --host=remote_host -C db_name

       It is possible to dump several databases with one command:

	   shell> mysqldump --databases db_name1 [db_name2 ...] > my_databases.sql

       To dump all databases, use the --all-databases option:

	   shell> mysqldump --all-databases > all_databases.sql

       For InnoDB tables, mysqldump provides a way of making an online backup:

	   shell> mysqldump --all-databases --single-transaction > all_databases.sql

       This backup acquires a global read lock on all tables (using FLUSH TABLES WITH READ LOCK)
       at the beginning of the dump. As soon as this lock has been acquired, the binary log
       coordinates are read and the lock is released. If long updating statements are running
       when the FLUSH statement is issued, the MySQL server may get stalled until those
       statements finish. After that, the dump becomes lock free and does not disturb reads and
       writes on the tables. If the update statements that the MySQL server receives are short
       (in terms of execution time), the initial lock period should not be noticeable, even with
       many updates.

       For point-in-time recovery (also known as "roll-forward," when you need to restore an old
       backup and replay the changes that happened since that backup), it is often useful to
       rotate the binary log (see Section 5.2.4, "The Binary Log") or at least know the binary
       log coordinates to which the dump corresponds:

	   shell> mysqldump --all-databases --master-data=2 > all_databases.sql


	   shell> mysqldump --all-databases --flush-logs --master-data=2
			 > all_databases.sql

       The --master-data and --single-transaction options can be used simultaneously, which
       provides a convenient way to make an online backup suitable for use prior to point-in-time
       recovery if tables are stored using the InnoDB storage engine.

       For more information on making backups, see Section 6.2, "Database Backup Methods", and
       Section 6.3, "Example Backup and Recovery Strategy".

       If you encounter problems backing up views, please read the section that covers
       restrictions on views which describes a workaround for backing up views when this fails
       due to insufficient privileges. See Section D.4, "Restrictions on Views".

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

       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 warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
       PURPOSE. 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 02110-1301 USA or see http://www.gnu.org/licenses/.

	1. Bug#30123

       For more information, please refer to the MySQL Reference Manual, which may already be
       installed locally and which is also available online at http://dev.mysql.com/doc/.

       Sun Microsystems, Inc. (http://www.mysql.com/).

MySQL 5.1				    04/06/2010				     MYSQLDUMP(1)
Unix & Linux Commands & Man Pages : ©2000 - 2018 Unix and Linux Forums

All times are GMT -4. The time now is 05:40 AM.