在ubuntu8。04环境下用新立得安装了mysql，启动服务器没有问题，登录创建数据库，创建表也没有问题
就是有一点，我describe 表的时候出现错误：
mysql> desc pet;
ERROR 1 (HY000): Can't create/write to file '/tmp/#sql_157f_0.MYI' (Errcode: 13)；
sudo /etc/init.d/mysql start启动服务器
mysql -u root -p ＋密码登录
我已经给root用户增设了权限
mysql> grant allprivileges on *.* to root@localhost;
对于下面我附加的我的my.cnf文件中的
tmpdir = /tmp
我已经修改了她的权限
桌面$ sudo chown root:root /tmp
桌面$ sudo chmod 1777 /tmp
但是无论如何还是不能desc ＋表；
还有就是我向表中添加数据，删除数据，查询数据都没有问题，真是急死人。
下面是我的附加的my.cnf文件
我的是在／etc/mysql目录下
#
# The MySQL database server configuration file.
#
# You can copy this to one of:
# - "/etc/mysql/my.cnf" to set global options,
# - "~/.my.cnf" to set user-specific options.
#
# One can use all long options that the program supports.
# Run program with --help to get a list of available options and with
# --print-defaults to see which it would actually understand and use.
#
# For explanations see
# http://dev.mysql.com/doc/mysql/en/serve ... ables.html
# This will be passed to all mysql clients
# It has been reported that passwords should be enclosed with ticks/quotes
# escpecially if they contain "#" chars...
# Remember to edit /etc/mysql/debian.cnf when changing the socket location.
[client]
port = 3306
socket = /var/run/mysqld/mysqld.sock
# Here is entries for some specific programs
# The following values assume you have at least 32M ram
# This was formally known as [safe_mysqld]. Both versions are currently parsed.
[mysqld_safe]
socket = /var/run/mysqld/mysqld.sock
nice = 0
[mysqld]
#
# * Basic Settings
#
#
# * IMPORTANT
# If you make changes to these settings and your system uses apparmor, you may
# also need to also adjust /etc/apparmor.d/usr.sbin.mysqld.
#
user = mysql
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld.sock
port = 3306
basedir = /usr
datadir = /var/lib/mysql
tmpdir = /tmp
language = /usr/share/mysql/english
skip-external-locking
#
# Instead of skip-networking the default is now to listen only on
# localhost which is more compatible and is not less secure.
bind-address = 127.0.0.1
#
# * Fine Tuning
#
key_buffer = 16M
max_allowed_packet = 16M
thread_stack = 128K
thread_cache_size = 8
#max_connections = 100
#table_cache = 64
#thread_concurrency = 10
#
# * Query Cache Configuration
#
query_cache_limit = 1M
query_cache_size = 16M
#
# * Logging and Replication
#
# Both location gets rotated by the cronjob.
# Be aware that this log type is a performance killer.
#log = /var/log/mysql/mysql.log
#
# Error logging goes to syslog. This is a Debian improvement 
#
# Here you can see queries with especially long duration
#log_slow_queries = /var/log/mysql/mysql-slow.log
#long_query_time = 2
#log-queries-not-using-indexes
#
# The following can be used as easy to replay backup logs or for replication.
# note: if you are setting up a replication slave, see README.Debian about
# other settings you may need to change.
#server-id = 1
#log_bin = /var/log/mysql/mysql-bin.log
expire_logs_days = 10
max_binlog_size = 100M
#binlog_do_db = include_database_name
#binlog_ignore_db = include_database_name
#
# * BerkeleyDB
#
# Using BerkeleyDB is now discouraged as its support will cease in 5.1.12.
skip-bdb
#
# * InnoDB
#
# InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/.
# Read the manual for more InnoDB related options. There are many!
# You might want to disable InnoDB to shrink the mysqld process by circa 100MB.
#skip-innodb
#
# * Security Features
#
# Read the manual, too, if you want chroot!
# chroot = /var/lib/mysql/
#
# For generating SSL certificates I recommend the OpenSSL GUI "tinyca".
#
# ssl-ca=/etc/mysql/cacert.pem
# ssl-cert=/etc/mysql/server-cert.pem
# ssl-key=/etc/mysql/server-key.pem
[mysqldump]
quick
quote-names
max_allowed_packet = 16M
[mysql]
#no-auto-rehash # faster start of mysql but no tab completition
[isamchk]
key_buffer = 16M
#
# * NDB Cluster
#
# See /usr/share/doc/mysql-server-*/README.Debian for more information.
#
# The following configuration is read by the NDB Data Nodes (ndbd processes)
# not from the NDB Management Nodes (ndb_mgmd processes).
#
# [MYSQL_CLUSTER]
# ndb-connectstring=127.0.0.1
#
# * IMPORTANT: Additional settings that can override those from this file!
# The files must end with '.cnf', otherwise they'll be ignored.
#
!includedir /etc/mysql/conf.d/
解决方法:
Try the following:
1.mkdir /var/lib/mysql/tmp
2.chmod mysql:mysql /var/lib/mysql/tmp
3.Add the following line into the[mysql]section:tmpdir = /var/lib/mysql/tmp
4.restart the server
我尝试上面建议的操作：
1.肯定没有问题，创建一个文件夹/var/lib/mysql/tmp
2.肯定有问题，压根就没有发现过这样的用法,可能这个帖子是给高手看的，反思了半天，我才知道说的是：
chown mysql:mysql /var/lib/mysql/tmp（自己查看chmod和chown的作用和用法）
3.看似没有问题，其实是有问题，他说的是Add，其实不是添加的意思，而是修改的意思
4.没有问题
经过修改中的修改我的mysql正常运行了
mysql> desc pet;
+---------+----------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+---------+----------+------+-----+---------+-------+
| name | char(10) | YES | | NULL | |
| address | char(20) | YES | | NULL | |
+---------+----------+------+-----+---------+-------+
这个问题困扰了我一个月之久，希望对遇到或者将来有可能遇到这类问题的有志之士有所帮助。
当然，系统和机子不一样可能有所不同，望因事而异！
