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Full Discussion: Confused maybe about MySQL Dump & PHP
Top Forums Web Development Confused maybe about MySQL Dump & PHP Post 302321791 by otheus on Tuesday 2nd of June 2009 06:17:41 AM
Old 06-02-2009
If he'll put it in a cronjob, you cannot rightly assume what the PWD (present working directory) will be, so that the line:
Code:
sql_bDir="./sql_backups/" #LOCATION FOR SQL BACKUPS TO LAND

Doesn't make sense. You need a full path, or maybe something prefixed with $HOME.

Second, the mysqldump line should be:
Code:
mysqldump -u NAME -p PASS  DBASENAME

Finally, you should understand that the output is not automatically compressed. Do that separately, via a pipe
Code:
mysqldump -u NAME -p PASS  | gzip -c > $sql_bName.gz

Finally, you might gain some performance by buffering the output through a program called "dd". This allows mysqldump to do its work for a longer time before switching over to do the compression.
Code:
mysqldump -u NAME -p PASS DBASENAME  | dd bs=1M | gzip -c > $sql_bName.gz

For my dump, I make sure the dump is done in a "single-transaction" to ensure that the dump represents a recoverable state. (ie, transactions don't take place during the dump). I also send the output to bzip2 for higher compression.
Code:
mysqldump -u NAME -p PASS --single-transaction DBASENAME | dd bs=1M | bzip2 -c >dumpfile

 

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LEARN ABOUT REDHAT

perror

PERROR(1)						      General Commands Manual							 PERROR(1)

NAME

       perror  can  be	used  to display a description for a system error code, or an MyISAM/ISAM table handler error code. The error messages are
       mostly system dependent.

USAGE

       perror [OPTIONS] [ERRORCODE [ERRORCODE...]]

SYNOPSIS

       perror [-?|--help] [-I|--info] [-s|--silent] [-v|--verbose] [-V|--version]

DESCRIPTION

       -?|--help
	      Displays this help and exits.

       -I|--info
	      Synonym for the above.

       -s|--silent
	      Only print the error message

       -v|--verbose
	      Print error code and message (default).

       -V|--version
	      Displays version information and exits.

EXAMPLE

       shell> perror 64 79 Error code  64:  Machine is not on the network Error code  79:  Can not access a needed shared library

SEE ALSO

       isamchk (1), isamlog (1), mysqlaccess (1), mysqladmin (1), mysqlbug (1), mysqld (1), mysqldump (1), mysqlshow (1), msql2mysql  (1),  perror
       (1), replace (1), safe_mysqld (1), which1 (1), zap (1),

AUTHOR

       Ver  1.0,  distribution 3.23.29a Michael (Monty) Widenius (monty@tcx.se), TCX Datakonsult AB (http://www.tcx.se).  This software comes with
       no warranty.  Manual page by L. (Kill-9) Pedersen (kill-9@kill-9.dk), Mercurmedia Data Model Architect / system developer  (http://www.mer-
       curmedia.com)

								 19 December 2000							 PERROR(1)
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