运行环境： centos5.0 mysql5.0.45-log

php语言

my.cnf 配置如下：[mysqld]

default-character-set = gbk

port= 3306

socket= /tmp/mysql.sock

skip-locking

key_buffer = 32M

key_buffer_size = 256M

max_allowed_packet = 1M

table_cache = 256

sort_buffer_size = 512K

net_buffer_length = 8K

read_buffer_size = 256K

read_rnd_buffer_size = 512K

myisam_sort_buffer_size = 8M

log-slow-queries = /data/www/wwwroot/bbs/mysqld-slow-query.log

log = /data/www/wwwroot/bbs/mysqld-general-query.log

long-query-time = 5

log-long-format

log-queries-not-using-indexes

server-id= 1

[mysqldump]

quick

max_allowed_packet = 16M

[mysql]

default-character-set = gbk

no-auto-rehash

[isamchk]

key_buffer = 20M

sort_buffer_size = 20M

read_buffer = 2M

write_buffer = 2M

[myisamchk]

key_buffer = 20M

sort_buffer_size = 20M

read_buffer = 2M

write_buffer = 2M

[mysqlhotcopy]

interactive-timeout

query_cache_type = 1

query_cache_size = 200M

query_cache_limit = 1048576

表结构：

cdb_lu_digestimages_images  CREATE TABLE `cdb_lu_digestimages_images` (

`id` int(10) unsigned NOT NULL auto_increment,

`aid` int(10) unsigned NOT NULL,

`title` char(100) NOT NULL,

`description` char(100) NOT NULL,

`tid` int(10) NOT NULL,

`uid` int(8) unsigned NOT NULL default '0',

`fid` smallint(6) unsigned NOT NULL default '0',

`pid` int(10) NOT NULL,

`typeid` smallint(5) unsigned NOT NULL,

`thumbnail` char(60) NOT NULL,

`dateline` int(10) unsigned NOT NULL default '0',

`adddateline` int(10) unsigned NOT NULL default '0',

`adduid` mediumint(8) unsigned NOT NULL default '0',

`isshow` tinyint(1) NOT NULL,

`iscall` tinyint(1) NOT NULL,

`width` smallint(5) unsigned NOT NULL default '180',

`height` smallint(5) unsigned NOT NULL default '180',

PRIMARY KEY  (`id`),

UNIQUE KEY `aid` (`aid`),

KEY `title` (`title`),

KEY `description` (`description`),

KEY `tid` (`tid`),

KEY `typeid` (`typeid`),

KEY `isshow` (`isshow`),

KEY `iscall` (`iscall`),

KEY `isshow_orderby` (`tid`,`aid`)

) ENGINE=MyISAM AUTO_INCREMENT=475737 DEFAULT CHARSET=gbk

/*Index Information For - redocn.cdb_lu_digestimages_images*/

-------------------------------------------------------------

Table                       Non_unique  Key_name        Seq_in_index  Column_name  Collation  Cardinality  Sub_part  Packed  Null    Index_type  Comment

--------------------------  ----------  --------------  ------------  -----------  ---------  -----------  --------  ------  ------  ----------  -------

cdb_lu_digestimages_images           0  PRIMARY                    1  id           A               398113    (NULL)  (NULL)          BTREE

cdb_lu_digestimages_images           0  aid                        1  aid          A               398113    (NULL)  (NULL)          BTREE

cdb_lu_digestimages_images           1  title                      1  title        A                39811    (NULL)  (NULL)          BTREE

cdb_lu_digestimages_images           1  description                1  description  A               199056    (NULL)  (NULL)          BTREE

cdb_lu_digestimages_images           1  tid                        1  tid          A                39811    (NULL)  (NULL)          BTREE

cdb_lu_digestimages_images           1  typeid                     1  typeid       A                  632    (NULL)  (NULL)          BTREE

cdb_lu_digestimages_images           1  isshow                     1  isshow       A                    2    (NULL)  (NULL)          BTREE

cdb_lu_digestimages_images           1  iscall                     1  iscall       A                    2    (NULL)  (NULL)          BTREE

cdb_lu_digestimages_images           1  isshow_orderby             1  tid          A                39811    (NULL)  (NULL)          BTREE

cdb_lu_digestimages_images           1  isshow_orderby             2  aid          A               398113    (NULL)  (NULL)          BTREE

表明：cdb_lu_digestimages_images  其中共有398113条记录

语句1：SELECT * FROM cdb_lu_digestimages_images WHERE 1 AND isshow='1' ORDER BY iscall DESC, tid DESC, aid ASC LIMIT 0, 36

语句2：SELECT * FROM cdb_lu_digestimages_images WHERE 1 AND isshow='1' AND typeid='403' AND (title LIKE '%中国%' OR description LIKE '%中国%') ORDER BY iscall DESC, tid DESC, aid ASC LIMIT 0, 36

我应该如何优化？

现在查询至少9秒？

为了减轻服务器压力翻页限制在100页以内，一旦放开，mysql压力立马增加。

我应该怎么样建索引，以及设置mysql参数

2009年7月03日 16:22