mysql


SYNOPSIS
       mysql [options] db_name

DESCRIPTION
       mysql is a simple SQL shell (with GNU readline capabilities). It
       supports interactive and non-interactive use. When used interactively,
       query results are presented in an ASCII-table format. When used
       non-interactively (for example, as a filter), the result is presented
       in tab-separated format. The output format can be changed using command
       options.

       If you have problems due to insufficient memory for large result sets,
       use the --quick option. This forces mysql to retrieve results from the
       server a row at a time rather than retrieving the entire result set and
       buffering it in memory before displaying it. This is done by returning
       the result set using the mysql_use_result() C API function in the
       client/server library rather than mysql_store_result().

       Using mysql is very easy. Invoke it from the prompt of your command
       interpreter as follows:

          shell> mysql db_name

       Or:

          shell> mysql --user=user_name --password=your_password db_name

       Then type an SQL statement, end it with ";", \g, or \G and press Enter.

       As of MySQL 5.0.25, typing Control-C causes mysql to attempt to kill
       the current statement. If this cannot be done, or Control-C is typed
       again before the statement is killed, mysql exits. Previously,
       Control-C caused mysql to exit in all cases.

       You can execute SQL statements in a script file (batch file) like this:

          shell> mysql db_name < script.sql > output.tab

MYSQL OPTIONS
       mysql supports the options in the following list. It also reads option
       files and supports the options for processing them described at
       Section 4.2.3.2.1, "Command-Line Options that Affect Option-File
       Handling".

       o  --help, -?

          Display a help message and exit.

       o  --auto-rehash

          Enable automatic rehashing. This option is on by default, which
          enables database, table, and column name completion. Use
          --disable-auto-rehash to disable rehashing. That causes mysql to

          Batch mode results in non-tabular output format and escaping of
          special characters. Escaping may be disabled by using raw mode; see
          the description for the --raw option.

       o  --character-sets-dir=path

          The directory where character sets are installed. See Section 9.2,
          "The Character Set Used for Data and Sorting".

       o  --column-names

          Write column names in results.

       o  --comments, -c

          Whether to preserve comments in statements sent to the server. The
          default is --skip-comments (discard comments), enable with
          --comments (preserve comments). This option was added in MySQL
          5.0.52.

       o  --compress, -C

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

       o  --database=db_name, -D db_name

          The database to use. This is useful primarily in an option file.

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

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

       o  --debug-info, -T

          Print some debugging information when the program exits.

       o  --default-character-set=charset_name

          Use charset_name as the default character set. See Section 9.2, "The
          Character Set Used for Data and Sorting".

       o  --delimiter=str

          Set the statement delimiter. The default is the semicolon character
          (";").

       o  --disable-named-commands

          Disable named commands. Use the \* form only, or use named commands
          only at the beginning of a line ending with a semicolon (";").
          mysql starts with this option enabled by default. However, even with

       o  --host=host_name, -h host_name

          Connect to the MySQL server on the given host.

       o  --html, -H

          Produce HTML output.

       o  --ignore-spaces, -i

          Ignore spaces after function names. The effect of this is described
          in the discussion for the IGNORE_SPACE SQL mode (see Section 5.1.7,
          "Server SQL Modes").

       o  --line-numbers

          Write line numbers for errors. Disable this with
          --skip-line-numbers.

       o  --local-infile[={0|1}]

          Enable or disable LOCAL capability for LOAD DATA INFILE. With no
          value, the option enables LOCAL. The option may be given as
          --local-infile=0 or --local-infile=1 to explicitly disable or enable
          LOCAL. Enabling LOCAL has no effect if the server does not also
          support it.

       o  --named-commands, -G

          Enable named mysql commands. Long-format commands are allowed, not
          just short-format commands. For example, quit and \q both are
          recognized. Use --skip-named-commands to disable named commands. See
          the section called "MYSQL COMMANDS".

       o  --no-auto-rehash, -A

          Deprecated form of -skip-auto-rehash. Use --disable-auto-rehash
          instead. See the description for --auto-rehash.

       o  --no-beep, -b

          Do not beep when errors occur.

       o  --no-named-commands, -g

          Deprecated, use --disable-named-commands instead.

       o  --no-pager

          Deprecated form of --skip-pager. See the --pager option.

       o  --no-tee

          omitted, the default pager is the value of your PAGER environment
          variable. Valid pagers are less, more, cat [> filename], and so
          forth. This option works only on Unix. It does not work in batch
          mode. To disable paging, use --skip-pager.  the section called
          "MYSQL COMMANDS", discusses output paging further.

       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, you are prompted for
          one.

          Specifying a password on the command line should be considered
          insecure. See Section 5.5.6.2, "End-User Guidelines for Password
          Security".

       o  --pipe, -W

          On Windows, connect to the server via a named pipe. This option
          applies only for connections to a local server, and 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  --prompt=format_str

          Set the prompt to the specified format. The default is mysql>. The
          special sequences that the prompt can contain are described in the
          section called "MYSQL COMMANDS".

       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

          Do not cache each query result, print each row as it is received.
          This may slow down the server if the output is suspended. With this
          option, mysql does not use the history file.

       o  --raw, -r

          For tabular output, the "boxing" around columns enables one column
          value to be distinguished from another. For non-tabular output (such
          as is produced in batch mode or when the --batch or --silent option
          is given), special characters are escaped in the output so they can
          | \        |
          +----------+
          % mysql -s
          mysql> SELECT CHAR(92);
          CHAR(92)
          \\
          % mysql -s -r
          mysql> SELECT CHAR(92);
          CHAR(92)
          \

       o  --reconnect

          If the connection to the server is lost, automatically try to
          reconnect. A single reconnect attempt is made each time the
          connection is lost. To suppress reconnection behavior, use
          --skip-reconnect.

       o  --safe-updates, --i-am-a-dummy, -U

          Allow only those UPDATE and DELETE statements that specify which
          rows to modify by using key values. If you have set this option in
          an option file, you can override it by using --safe-updates on the
          command line. See the section called "MYSQL TIPS", for more
          information about this option.

       o  --secure-auth

          Do not send passwords to the server in old (pre-4.1.1) format. This
          prevents connections except for servers that use the newer password
          format.

       o  --show-warnings

          Cause warnings to be shown after each statement if there are any.
          This option applies to interactive and batch mode. This option was
          added in MySQL 5.0.6.

       o  --sigint-ignore

          Ignore SIGINT signals (typically the result of typing Control-C).

       o  --silent, -s

          Silent mode. Produce less output. This option can be given multiple
          times to produce less and less output.

          This option results in non-tabular output format and escaping of
          special characters. Escaping may be disabled by using raw mode; see
          the description for the --raw option.

       o  --skip-column-names, -N

          Do not write column names in results. The short format, -N is

       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 5.5.7.3, "SSL Command Options".

       o  --table, -t

          Display output in table format. This is the default for interactive
          use, but can be used to produce table output in batch mode.

       o  --tee=file_name

          Append a copy of output to the given file. This option does not work
          in batch mode.  the section called "MYSQL COMMANDS", discusses tee
          files further.

       o  --unbuffered, -n

          Flush the buffer after each query.

       o  --user=user_name, -u user_name

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

       o  --verbose, -v

          Verbose mode. Produce more output about what the program does. This
          option can be given multiple times to produce more and more output.
          (For example, -v -v -v produces table output format even in batch
          mode.)

       o  --version, -V

          Display version information and exit.

       o  --vertical, -E

          Print query output rows vertically (one line per column value).
          Without this option, you can specify vertical output for individual
          statements by terminating them with \G.

       o  --wait, -w

          If the connection cannot be established, wait and retry instead of
          aborting.

       o  --xml, -X

          Produce XML output.

          Note
          Prior to MySQL 5.0.26, there was no differentiation in the output
          <?xml version="1.0"?>
          <resultset statement="SHOW VARIABLES LIKE 'version%'" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
          <row>
          <field name="Variable_name">version</field>
          <field name="Value">5.0.40-debug</field>
          </row>
          <row>
          <field name="Variable_name">version_comment</field>
          <field name="Value">Source distribution</field>
          </row>
          <row>
          <field name="Variable_name">version_compile_machine</field>
          <field name="Value">i686</field>
          </row>
          <row>
          <field name="Variable_name">version_compile_os</field>
          <field name="Value">suse-linux-gnu</field>
          </row>
          </resultset>

       (See [1]Bug#25946.)


       You can also set the following variables by using --var_name=value. The
       --set-variable format is deprecated.

       o  connect_timeout

          The number of seconds before connection timeout. (Default value is
          0.)

       o  max_allowed_packet

          The maximum packet length to send to or receive from the server.
          (Default value is 16MB.)

       o  max_join_size

          The automatic limit for rows in a join when using --safe-updates.
          (Default value is 1,000,000.)

       o  net_buffer_length

          The buffer size for TCP/IP and socket communication. (Default value
          is 16KB.)

       o  select_limit

          The automatic limit for SELECT statements when using --safe-updates.
          (Default value is 1,000.)


       It is also possible to set variables by using --var_name=value. The
       --set-variable format is deprecated.
       .mysql_history if it exists, and then use either of the following
       techniques:

       o  Set the MYSQL_HISTFILE variable to /dev/null. To cause this setting
          to take effect each time you log in, put the setting in one of your
          shell's startup files.

       o  Create .mysql_history as a symbolic link to /dev/null:

          shell> ln -s /dev/null $HOME/.mysql_history
       You need do this only once.

MYSQL COMMANDS
       mysql sends each SQL statement that you issue to the server to be
       executed. There is also a set of commands that mysql itself interprets.
       For a list of these commands, type help or \h at the mysql> prompt:

          mysql> help
          List of all MySQL commands:
          Note that all text commands must be first on line and end with ';'
          ?         (\?) Synonym for `help'.
          clear     (\c) Clear command.
          connect   (\r) Reconnect to the server. Optional arguments are db and host.
          delimiter (\d) Set statement delimiter.
          edit      (\e) Edit command with $EDITOR.
          ego       (\G) Send command to mysql server, display result vertically.
          exit      (\q) Exit mysql. Same as quit.
          go        (\g) Send command to mysql server.
          help      (\h) Display this help.
          nopager   (\n) Disable pager, print to stdout.
          notee     (\t) Don't write into outfile.
          pager     (\P) Set PAGER [to_pager]. Print the query results via PAGER.
          print     (\p) Print current command.
          prompt    (\R) Change your mysql prompt.
          quit      (\q) Quit mysql.
          rehash    (\#) Rebuild completion hash.
          source    (\.) Execute an SQL script file. Takes a file name as an argument.
          status    (\s) Get status information from the server.
          system    (\!) Execute a system shell command.
          tee       (\T) Set outfile [to_outfile]. Append everything into given
                         outfile.
          use       (\u) Use another database. Takes database name as argument.
          charset   (\C) Switch to another charset. Might be needed for processing
                         binlog with multi-byte charsets.
          warnings  (\W) Show warnings after every statement.
          nowarning (\w) Don't show warnings after every statement.
          For server side help, type 'help contents'

       Each command has both a long and short form. The long form is not case
       sensitive; the short form is. The long form can be followed by an
       optional semicolon terminator, but the short form should not.

       The use of short-form commands within multi-line /* ... */ comments is
       not supported.
          The charset command changes the default character set and issues a
          SET NAMES statement. This enables the character set to remain
          synchronized on the client and server if mysql is run with
          auto-reconnect enabled (which is not recommended), because the
          specified character set is used for reconnects. This command was
          added in MySQL 5.0.19.

       o  clear, \c

          Clears the current input. Use this if you change your mind about
          executing the statement that you are entering.

       o  connect [db_name host_name]], \r [db_name host_name]]

          Reconnects to the server. The optional database name and host name
          arguments may be given to specify the default database or the host
          where the server is running. If omitted, the current values are
          used.

       o  delimiter str, \d str

          The delimiter command changes the string that mysql interprets as
          the separator between SQL statements. The default is the semicolon
          character (";").

          The delimiter can be specified as an unquoted or quoted argument.
          Quoting can be done with either single quote (') or douple quote (")
          characters. To include a quote within a quoted string, either quote
          the string with the other quote character or escape the quote with a
          backslash ("\") character. Backslash should be avoided outside of
          quoted strings because it is the escape character for MySQL. For an
          unquoted argument, the delmiter is read up to the first space or end
          of line. For a quoted argument, the delimiter is read up to the
          matching quote on the line.

          When the delimiter recognized by mysql is set to something other
          than the default of ";", instances of that character are sent to the
          server without interpretation. However, the server itself still
          interprets ";" as a statement delimiter and processes statements
          accordingly. This behavior on the server side comes into play for
          multiple-statement execution (see Section 20.9.12, "C API Support
          for Multiple Statement Execution"), and for parsing the body of
          stored procedures and functions and triggers (see Section 18.1,
          "Defining Stored Programs").

       o  edit, \e

          Edits the current input statement.  mysql checks the values of the
          EDITOR and VISUAL environment variables to determine which editor to
          use. The default editor is vi if neither variable is set.

          The edit command works only in Unix.

       o  ego, \G
       o  nopager, \n

          Disables output paging. See the description for pager.

          The nopager command works only in Unix.

       o  notee, \t

          Disables output copying to the tee file. See the description for
          tee.

       o  nowarning, \w

          Enables display of warnings after each statement. This command was
          added in MySQL 5.0.6.

       o  pager [command], \P [command]

          By using the --pager option when you invoke mysql, it is possible to
          browse or search query results in interactive mode with Unix
          programs such as less, more, or any other similar program. If you
          specify no value for the option, mysql checks the value of the PAGER
          environment variable and sets the pager to that.

          Output paging can be enabled interactively with the pager command
          and disabled with nopager. The command takes an optional argument;
          if given, the paging program is set to that. With no argument, the
          pager is set to the pager that was set on the command line, or
          stdout if no pager was specified.

          Output paging works only in Unix because it uses the popen()
          function, which does not exist on Windows. For Windows, the tee
          option can be used instead to save query output, although it is not
          as convenient as pager for browsing output in some situations.

       o  print, \p

          Prints the current input statement without executing it.

       o  prompt [str], \R [str]

          Reconfigures the mysql prompt to the given string. The special
          character sequences that can be used in the prompt are described
          later in this section.

          If you specify the prompt command with no argument, mysql resets the
          prompt to the default of mysql>.

       o  quit, \q

          Exits mysql.

       o  rehash, \#

          and the server you are using. If you are running in --safe-updates
          mode, status also prints the values for the mysql variables that
          affect your queries.

       o  system command, \! command

          Executes the given command using your default command interpreter.

          The system command works only in Unix.

       o  tee [file_name], \T [file_name]

          By using the --tee option when you invoke mysql, you can log
          statements and their output. All the data displayed on the screen is
          appended into a given file. This can be very useful for debugging
          purposes also.  mysql flushes results to the file after each
          statement, just before it prints its next prompt.

          You can enable this feature interactively with the tee command.
          Without a parameter, the previous file is used. The tee file can be
          disabled with the notee command. Executing tee again re-enables
          logging.

       o  use db_name, \u db_name

          Uses db_name as the default database.

       o  warnings, \W

          Enables display of warnings after each statement (if there are any).
          This command was added in MySQL 5.0.6.


       Here are a few tips about the pager command:

       o  You can use it to write to a file and the results go only to the
          file:

          mysql> pager cat > /tmp/log.txt
       You can also pass any options for the program that you want to use as
       your pager:

          mysql> pager less -n -i -S

       o  In the preceding example, note the -S option. You may find it very
          useful for browsing wide query results. Sometimes a very wide result
          set is difficult to read on the screen. The -S option to less can
          make the result set much more readable because you can scroll it
          horizontally using the left-arrow and right-arrow keys. You can also
          use -S interactively within less to switch the horizontal-browse
          mode on and off. For more information, read the less manual page:

          shell> man less

       two different directories on two different file systems mounted on /dr1
       and /dr2, yet still display the results onscreen via less.


       You can also combine the tee and pager functions. Have a tee file
       enabled and pager set to less, and you are able to browse the results
       using the less program and still have everything appended into a file
       the same time. The difference between the Unix tee used with the pager
       command and the mysql built-in tee command is that the built-in tee
       works even if you do not have the Unix tee available. The built-in tee
       also logs everything that is printed on the screen, whereas the Unix
       tee used with pager does not log quite that much. Additionally, tee
       file logging can be turned on and off interactively from within mysql.
       This is useful when you want to log some queries to a file, but not
       others.

       The prompt command reconfigures the default mysql> prompt. The string
       for defining the prompt can contain the following special sequences.

       +---------------------+-------------------------------------+
       |Option               | Description                         |
       +---------------------+-------------------------------------+
       |\o                   | The current month in                |
       |                     | numeric format                      |
       +---------------------+-------------------------------------+
       |\P                   | am/pm                               |
       +---------------------+-------------------------------------+
       |\p                   | The current TCP/IP port or          |
       |                     | socket file                         |
       +---------------------+-------------------------------------+
       |\R                   | The current time, in                |
       |                     | 24-hour military time               |
       |                     | (0-23)                              |
       +---------------------+-------------------------------------+
       |\r                   | The current time, standard          |
       |                     | 12-hour time (1-12)                 |
       +---------------------+-------------------------------------+
       |\S                   | Semicolon                           |
       +---------------------+-------------------------------------+
       |\s                   | Seconds of the current              |
       |                     | time                                |
       +---------------------+-------------------------------------+
       |\t                   | A tab character                     |
       +---------------------+-------------------------------------+
       |\U                   | Your full                           |
       |                     |                 user_name@host_name |
       |                     |                 account             |
       |                     | name                                |
       +---------------------+-------------------------------------+
       |\u                   | Your user name                      |
       +---------------------+-------------------------------------+
       |\c                   | A counter that increments for each  |
       |                     | statement you issue                 |
       +---------------------+-------------------------------------+
       |                     | backslash)                          |
       +---------------------+-------------------------------------+
       |\'                   | Single quote                        |
       +---------------------+-------------------------------------+
       |\"                   | Double quote                        |
       +---------------------+-------------------------------------+
       |\T}:T{ A literal "\" |                                     |
       |backslash character  |                                     |
       +---------------------+-------------------------------------+
       |\x                   | x, for any                          |
       |                     |                 "x" not listed      |
       |                     |                 above               |
       +---------------------+-------------------------------------+
       |\D                   | The full current date               |
       +---------------------+-------------------------------------+
       |\d                   | The default database                |
       +---------------------+-------------------------------------+
       |\h                   | The server host                     |
       +---------------------+-------------------------------------+
       |\l                   | The current delimiter (new in       |
       |                     | 5.0.25)                             |
       +---------------------+-------------------------------------+
       |\m                   | Minutes of the current time         |
       +---------------------+-------------------------------------+
       |\n                   | A newline character                 |
       +---------------------+-------------------------------------+
       |\O                   | The current month in three-letter   |
       |                     | format (Jan, Feb, ...)              |
       +---------------------+-------------------------------------+

       You can set the prompt in several ways:

       o  Use an environment variable.  You can set the MYSQL_PS1 environment
          variable to a prompt string. For example:

          shell> export MYSQL_PS1="(\u@\h) [\d]> "

       o  Use a command-line option.  You can set the --prompt option on the
          command line to mysql. For example:

          shell> mysql --prompt="(\u@\h) [\d]> "
          (user@host) [database]>

       o  Use an option file.  You can set the prompt option in the [mysql]
          group of any MySQL option file, such as /etc/my.cnf or the .my.cnf
          file in your home directory. For example:

          [mysql]
          prompt=(\\u@\\h) [\\d]>\\_
       In this example, note that the backslashes are doubled. If you set the
       prompt using the prompt option in an option file, it is advisable to
       double the backslashes when using the special prompt options. There is
       some overlap in the set of allowable prompt options and the set of
       special escape sequences that are recognized in option files. (These
          mysql> prompt (\u@\h) [\d]>\_
          PROMPT set to '(\u@\h) [\d]>\_'
          (user@host) [database]>
          (user@host) [database]> prompt
          Returning to default PROMPT of mysql>
          mysql>

MYSQL SERVER-SIDE HELP
          mysql> help search_string

       If you provide an argument to the help command, mysql uses it as a
       search string to access server-side help from the contents of the MySQL
       Reference Manual. The proper operation of this command requires that
       the help tables in the mysql database be initialized with help topic
       information (see Section 5.1.8, "Server-Side Help").

       If there is no match for the search string, the search fails:

          mysql> help me
          Nothing found
          Please try to run 'help contents' for a list of all accessible topics

       Use help contents to see a list of the help categories:

          mysql> help contents
          You asked for help about help category: "Contents"
          For more information, type 'help <item>', where <item> is one of the
          following categories:
             Account Management
             Administration
             Data Definition
             Data Manipulation
             Data Types
             Functions
             Functions and Modifiers for Use with GROUP BY
             Geographic Features
             Language Structure
             Storage Engines
             Stored Routines
             Table Maintenance
             Transactions
             Triggers

       If the search string matches multiple items, mysql shows a list of
       matching topics:

          mysql> help logs
          Many help items for your request exist.
          To make a more specific request, please type 'help <item>',
          where <item> is one of the following topics:
             SHOW
             SHOW BINARY LOGS
             SHOW ENGINE
             SHOW LOGS

          mysql> SHOW BINARY LOGS;
          +---------------+-----------+
          | Log_name      | File_size |
          +---------------+-----------+
          | binlog.000015 |    724935 |
          | binlog.000016 |    733481 |
          +---------------+-----------+

EXECUTING SQL STATEMENTS FROM A TEXT FILE
       The mysql client typically is used interactively, like this:

          shell> mysql db_name

       However, it is also possible to put your SQL statements in a file and
       then tell mysql to read its input from that file. To do so, create a
       text file text_file that contains the statements you wish to execute.
       Then invoke mysql as shown here:

          shell> mysql db_name < text_file

       If you place a USE db_name statement as the first statement in the
       file, it is unnecessary to specify the database name on the command
       line:

          shell> mysql < text_file

       If you are already running mysql, you can execute an SQL script file
       using the source command or \.  command:

          mysql> source file_name
          mysql> \. file_name

       Sometimes you may want your script to display progress information to
       the user. For this you can insert statements like this:

          SELECT '<info_to_display>' AS ' ';

       The statement shown outputs <info_to_display>.

       As of MySQL 5.0.54, mysql ignores Unicode byte order mark (BOM)
       characters at the beginning of input files. Previously, it read them
       and sent them to the server, resulting in a syntax error. Presence of a
       BOM does not cause mysql to change its default character set. To do
       that, invoke mysql with an option such as --default-character-set=utf8.

       For more information about batch mode, see Section 3.5, "Using mysql in
       Batch Mode".

MYSQL TIPS
       This section describes some techniques that can help you use mysql more
       effectively.

   Displaying Query Results Vertically
       Some query results are much more readable when displayed vertically,
            mail_to: "Thimble Smith" <tim@no.spam.com>
                sbj: UTF-8
                txt: >>>>> "Thimble" == Thimble Smith writes:
          Thimble> Hi.  I think this is a good idea.  Is anyone familiar
          Thimble> with UTF-8 or Unicode? Otherwise, I'll put this on my
          Thimble> TODO list and see what happens.
          Yes, please do that.
          Regards,
          Monty
               file: inbox-jani-1
               hash: 190402944
          1 row in set (0.09 sec)

   Using the --safe-updates Option
       For beginners, a useful startup option is --safe-updates (or
       --i-am-a-dummy, which has the same effect). It is helpful for cases
       when you might have issued a DELETE FROM tbl_name statement but
       forgotten the WHERE clause. Normally, such a statement deletes all rows
       from the table. With --safe-updates, you can delete rows only by
       specifying the key values that identify them. This helps prevent
       accidents.

       When you use the --safe-updates option, mysql issues the following
       statement when it connects to the MySQL server:

          SET sql_safe_updates=1, sql_select_limit=1000, sql_max_join_size=1000000;

       See Section 5.1.4, "Session System Variables".

       The SET statement has the following effects:

       o  You are not allowed to execute an UPDATE or DELETE statement unless
          you specify a key constraint in the WHERE clause or provide a LIMIT
          clause (or both). For example:

          UPDATE tbl_name SET not_key_column=val WHERE key_column=val;
          UPDATE tbl_name SET not_key_column=val LIMIT 1;

       o  The server limits all large SELECT results to 1,000 rows unless the
          statement includes a LIMIT clause.

       o  The server aborts multiple-table SELECT statements that probably
          need to examine more than 1,000,000 row combinations.


       To specify limits different from 1,000 and 1,000,000, you can override
       the defaults by using the --select_limit and --max_join_size options:

          shell> mysql --safe-updates --select_limit=500 --max_join_size=10000

   Disabling mysql Auto-Reconnect
       If the mysql client loses its connection to the server while sending a
       statement, it immediately and automatically tries to reconnect once to
       the server and send the statement again. However, even if mysql
          No connection. Trying to reconnect...
          Connection id:    1
          Current database: test
          Query OK, 1 row affected (1.30 sec)
          mysql> SELECT * FROM t;
          +------+
          | a    |
          +------+
          | NULL |
          +------+
          1 row in set (0.05 sec)

       The @a user variable has been lost with the connection, and after the
       reconnection it is undefined. If it is important to have mysql
       terminate with an error if the connection has been lost, you can start
       the mysql client with the --skip-reconnect option.

       For more information about auto-reconnect and its effect on state
       information when a reconnection occurs, see Section 20.9.11,
       "Controlling Automatic Reconnection Behavior".

COPYRIGHT
       Copyright 2007-2008 MySQL AB, 2009 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/.

REFERENCES
       1. Bug#25946
          http://bugs.mysql.com/25946

SEE ALSO
       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/.

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



MySQL 5.0                         05/29/2009                          MYSQL(1)
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