为什么我设置的key_buffer_size 为0？

aaronvox

mysql> show variables like 'key_%';
+--------------------------+-------+
| Variable_name            | Value |
+--------------------------+-------+
| key_buffer_size          | 0     |
| key_cache_age_threshold  | 0     |
| key_cache_block_size     | 0     |
| key_cache_division_limit | 0     |
+--------------------------+-------+
4 rows in set (0.00 sec)

为什么我设置的key_buffer_size 为0？？？？？？？？？？？？？？？

但是 mysqld --help --verbose中显示确实正常的 怎么回事呢？？

1.   
   
2. mysql> show variables like 'key_buffer_size';
   
3. +-----------------+-------+
   
4. | Variable_name   | Value |
   
5. +-----------------+-------+
   
6. | key_buffer_size | 0     |
   
7. +-----------------+-------+
   
8. 1 row in set (0.00 sec)
   
9. 
   

复制代码

1.   
   
2. mysqld --help --verbose
   
3. key_buffer_size                   402653184
   
4. key_cache_block_size              1024
   
5. key_cache_division_limit          100
   

复制代码

晕

手工设置 可以

SET GLOBAL key_buffer_size=402653184
| key_buffer_size                 | 402653184

1.   
   
2. 
   
3. /opt/mysql> more .my.cnf
   
4. # Example mysql config file for large systems.
   
5. #
   
6. # This is for large system with memory = 512M where the system runs mainly
   
7. # MySQL.
   
8. #
   
9. # You can copy this file to
   
10. # /etc/my.cnf to set global options,
    
11. # mysql-data-dir/my.cnf to set server-specific options (in this
    
12. # installation this directory is /opt/dc_mysql/var) or
    
13. # ~/.my.cnf to set user-specific options.
    
14. #
    
15. # One can in this file use all long options that the program supports.
    
16. # If you want to know which options a program supports, run the program
    
17. # with the --help option.
    
18. 
    
19. # The following options will be passed to all MySQL clients
    
20. [client]
    
21. password        = root
    
22. user           = root
    
23. port            = 3306
    
24. socket          = /opt/mysql/var/mysql.sock
    
25. 
    
26. # Here follows entries for some specific programs
    
27. 
    
28. # The MySQL server
    
29. [mysqld]
    
30. port            = 3306
    
31. socket          = /opt/mysql/var/mysql.sock
    
32. skip-locking
    
33. back_log = 100
    
34. key_buffer_size = 384M
    
35. max_allowed_packet = 2M
    
36. table_cache = 1024
    
37. sort_buffer_size = 2M
    
38. read_buffer_size = 2M
    
39. read_rnd_buffer_size = 8M
    
40. myisam_sort_buffer_size = 64M
    
41. thread_cache = 8
    
42. query_cache_size= 32M
    
43. max_connections = 500
    
44. open_files_limit = 4096
    
45. wait_timeout = 28800
    
46. 
    
47. skip-name-resolv
    
48. 
    
49. # Try number of CPU's*2 for thread_concurrency
    
50. thread_concurrency = 8
    
51. 
    
52. # Don't listen on a TCP/IP port at all. This can be a security enhancement,
    
53. # if all processes that need to connect to mysqld run on the same host.
    
54. # All interaction with mysqld must be made via Unix sockets or named pipes.
    
55. # Note that using this option without enabling named pipes on Windows
    
56. # (via the "enable-named-pipe" option) will render mysqld useless!
    
57. #
    
58. #skip-networking
    
59. 
    
60. # Replication Master Server (default)
    
61. # binary logging is required for replication
    
62. log-bin
    
63. 
    
64. # required unique id between 1 and 2^32 - 1
    
65. # defaults to 1 if master-host is not set
    
66. # but will not function as a master if omitted
    
67. server-id       = 1
    
68. 
    
69. # Replication Slave (comment out master section to use this)
    
70. #
    
71. # To configure this host as a replication slave, you can choose between
    
72. # two methods :
    
73. #
    
74. # 1) Use the CHANGE MASTER TO command (fully described in our manual) -
    
75. #    the syntax is:
    
76. #
    
77. #    CHANGE MASTER TO MASTER_HOST=<host>, MASTER_PORT=<port>,
    
78. #    MASTER_USER=<user>, MASTER_PASSWORD=<password> ;
    
79. #
    
80. #    where you replace <host>, <user>, <password> by quoted strings and
    
81. #    <port> by the master's port number (3306 by default).
    
82. #
    
83. #    Example:
    
84. #
    
85. #    CHANGE MASTER TO MASTER_HOST='125.564.12.1', MASTER_PORT=3306,
    
86. #    MASTER_USER='joe', MASTER_PASSWORD='secret';
    
87. #
    
88. # OR
    
89. #
    
90. # 2) Set the variables below. However, in case you choose this method, then
    
91. #    start replication for the first time (even unsuccessfully, for example
    
92. #    if you mistyped the password in master-password and the slave fails to
    
93. #    connect), the slave will create a master.info file, and any later
    
94. #    change in this file to the variables' values below will be ignored and
    
95. #    overridden by the content of the master.info file, unless you shutdown
    
96. #    the slave server, delete master.info and restart the slaver server.
    
97. #    For that reason, you may want to leave the lines below untouched
    
98. #    (commented) and instead use CHANGE MASTER TO (see above)
    
99. #
    
100. # required unique id between 2 and 2^32 - 1
     
101. # (and different from the master)
     
102. # defaults to 2 if master-host is set
     
103. # but will not function as a slave if omitted
     
104. #server-id       = 2
     
105. #
     
106. # The replication master for this slave - required
     
107. #master-host     =   <hostname>
     
108. #
     
109. # The username the slave will use for authentication when connecting
     
110. # to the master - required
     
111. #master-user     =   <username>
     
112. #
     
113. # The password the slave will authenticate with when connecting to
     
114. # the master - required
     
115. #master-password =   <password>
     
116. #
     
117. # The port the master is listening on.
     
118. # optional - defaults to 3306
     
119. #master-port     =  <port>
     
120. #
     
121. # binary logging - not required for slaves, but recommended
     
122. #log-bin
     
123. 
     
124. # Point the following paths to different dedicated disks
     
125. #tmpdir         = /tmp/         
     
126. #log-update     = /path-to-dedicated-directory/hostname
     
127. 
     
128. # Uncomment the following if you are using BDB tables
     
129. #bdb_cache_size = 64M
     
130. #bdb_max_lock = 100000
     
131. 
     
132. # Uncomment the following if you are using InnoDB tables
     
133. #innodb_data_home_dir = /opt/dc_mysql/var/
     
134. #innodb_data_file_path = ibdata1:10M:autoextend
     
135. #innodb_log_group_home_dir = /opt/dc_mysql/var/
     
136. #innodb_log_arch_dir = /opt/dc_mysql/var/
     
137. # You can set .._buffer_pool_size up to 50 - 80 %
     
138. # of RAM but beware of setting memory usage too high
     
139. #innodb_buffer_pool_size = 256M
     
140. #innodb_additional_mem_pool_size = 20M
     
141. # Set .._log_file_size to 25 % of buffer pool size
     
142. #innodb_log_file_size = 64M
     
143. #innodb_log_buffer_size = 8M
     
144. #innodb_flush_log_at_trx_commit = 1
     
145. #innodb_lock_wait_timeout = 50
     
146. 
     
147. [mysqldump]
     
148. quick
     
149. max_allowed_packet = 16M
     
150. 
     
151. [mysql]
     
152. no-auto-rehash
     
153. # Remove the next comment character if you are not familiar with SQL
     
154. #safe-updates
     
155. 
     
156. [isamchk]
     
157. key_buffer = 256M
     
158. sort_buffer_size = 256M
     
159. read_buffer = 2M
     
160. write_buffer = 2M
     
161. 
     
162. [myisamchk]
     
163. key_buffer = 256M
     
164. sort_buffer_size = 256M
     
165. read_buffer = 2M
     
166. write_buffer = 2M
     
167. 
     
168. [mysqlhotcopy]
     
169. interactive-timeout
     
170. 
     

复制代码

[ 本帖最后由 aaronvox 于 2006-7-26 15:33 编辑 ]

yejr

原帖由 aaronvox 于 2006-7-26 10:29 发表
mysql> show variables like 'key_%';
+--------------------------+-------+
| Variable_name            | Value |
+--------------------------+-------+
| key_buffer_size          | 0     |
| key ...

因为你没设置

aaronvox

原帖由 yejr 于 2006-7-26 11:58 发表
因为你没设置

请问我需要在哪里设置
非常感谢

saiunix

我的wait_timeout = 9 就是不成功,很奇怪

yejr

参见 SET 语法，http://imysql.cn/?q=node/13

aaronvox

原帖由 yejr 于 2006-7-26 15:14 发表
参见 SET 语法，http://imysql.cn/?q=node/13

我只是想设置全局变量 而不是session的 所以想配置文件配置好久ok

可是这个参数始终就不能成功显示出来

我设置的max_connections =500 都成功了

我的内存是8G 所以大点可以

晕

手工设置 可以

SET GLOBAL key_buffer_size=402653184
| key_buffer_size                 | 402653184

[ 本帖最后由 aaronvox 于 2006-7-26 15:33 编辑 ]

yejr

你怎么修改配置文件的？