Orbeon MySQL连接不断下降

Question

几分钟后我经常失去MySQL连接。在我尝试连接之前，我在日志中看到没有错误。

我很高兴发布任何有助于调试的设置，只是让我知道你需要看到什么。

的context.xml：

<Resource name="jdbc/mysql" auth="Container" type="javax.sql.DataSource" 
     initialSize="10" maxActive="50" maxIdle="20" maxWait="60000" 
     driverClassName="com.mysql.jdbc.Driver" 
     poolPreparedStatements="true" 
     username="orbeon" 
     password="pw" 
     url="jdbc:mysql://localhost:3306/orbeon"/> 

的my.cnf：

[client] 
port = 3306 
socket = /var/run/mysqld/mysqld.sock 


[mysqld_safe] 
socket = /var/run/mysqld/mysqld.sock 
nice = 0 

[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 
skip-external-locking 
skip-name-resolve 

bind-address   = 0.0.0.0 


key-buffer   = 256M 
thread_stack   = 256K 
thread_cache_size  = 8 
max_allowed_packet = 16M 
max_connections  = 200 
myisam-recover  = BACKUP 
wait_timeout   = 180 
net_read_timeout  = 30 
net_write_timeout  = 30 
back_log    = 128 
table_cache   = 128 
max_heap_table_size = 32M 
lower_case_table_names = 0 


query_cache_limit   = 1M 
query_cache_size  = 16M 



log_error    = /var/log/mysql/error.log 

log_slow_queries   = /var/log/mysql/slow.log 
long-query-time  = 5 
log-queries-not-using-indexes 



[mysqldump] 
quick 
quote-names 
max_allowed_packet = 16M 

[mysql] 

[isamchk] 
key-buffer   = 256M 
max_allowed_packet = 16M 

!includedir /etc/mysql/conf.d/ 

Answer 1

尝试添加以下两个属性到现有的<Resource>为MySQL。通过这些，Tomcat中的连接池将在从池中获取连接后检查连接是否仍然可用。

validationQuery="select 1 from dual" 
testOnBorrow="true" 

所以你<Resource>应该是这个样子（当然用适当的用户名，密码和服务器）：

<Resource name="jdbc/mysql" auth="Container" type="javax.sql.DataSource" 
    initialSize="3" maxActive="10" maxIdle="20" maxWait="30000" 
    driverClassName="com.mysql.jdbc.Driver" 
    poolPreparedStatements="true" 
    validationQuery="select 1 from dual" 
    testOnBorrow="true" 
    username="orbeon" 
    password="orbeon" 
    url="jdbc:mysql://localhost:3306/orbeon?useUnicode=true&amp;characterEncoding=UTF8"/> 

Answer 2

为什么你有你的WAIT_TIMEOUT设置这么低???

http://dev.mysql.com/doc/refman/5.0/en/server-system-variables.html#sysvar_wait_timeout