Monster Oasis

覺得累就是進步的開始!

Sets the default timezone used by all date/time functions in a script

date_default_timezone_set( “Asia/Taipei” );

show status like ‘Qcache%’;

explain select …..

分析 schema 

echo “select * from tbl_item procedure analyse()\G” | mysql db_name > ana.txt

set GLOBAL query_cache_size=0

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On Unix, each TCP/IP connection uses a file descriptor, so you must increase the total number of descriptors available to the operating system, and also increase the maximum number of descriptors each process is allowed to use. All Unix style operating systems have a “ulimit” shell command (sh and bash) which can allow more open file descriptors to commands started in that shell, once the appropriate kernel tweak has been made. We recommend “ulimit -n 8192″. Here are our recommended kernel tweaks:

Linux: “echo 65536 > /proc/sys/fs/file-max” changes the number of system-wide file descriptors

FreeBSD: append to /etc/sysctl (or you can use sysctl -w to add these)

kern.maxfiles=65536
kern.maxfilesperproc=32768

Solaris: add the following to /etc/system and reboot:

set rlim_fd_max=0×8000
set rlim_fd_cur=0×8000

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You can check the same tips from here.Here is very useful tips for all mysql DBA’s,

Developers these tips are noted from MySQL Camp 2006 suggested by mysql community experts. (more…)