关于Linux系统下遇到的MySql问题，求指导
问题1：
Mysql是安装在linux体统中，操作是通过使用WindowsXP 下的软件Navicat 8 for MySQL，在连接上Linux中的数据库之后，打开了我使用的库，然后在事件中增加了一个事件，在事件的计划任务中，勾选了Every 1 Hour, Starts 2010-07-14 10:00:00。这个计划任务主要是调用了一个存储过程，存储过程语句如下：
begin
delete from GJ_VEH1L where JGSJ < date_sub( now(), interval 3 month) order by JGSJ;
delete from GJ_VEH1L_BACK where JGSJ < date_sub( now(), interval 3 month) order by JGSJ;
end
症状是，有的机器突然就不执行这个计划任务了，求解决方法及可能原因。
问题2：
在Linux系统中 配置 /etc/my.cnf文件，在【mysqld】下 加入了如下代码：
log=/data/GKJManager/mysql_log/log.log
slow-query-log_file=/data/GKJManager/mysql_log/slow-query-log.log
log-error=/data/GKJManager/mysql_log/log-err.log
log-queries-not-using-indexes = /data/GKJManager/mysql_log/nouseindex.log
希望能够打开 我计划任务执行时的日志，但是加了如下代码之后，在/data/GKJManager/mysql_log这个文件夹中，只产生了log-err.log，而且貌似只生成了 我输入service mysql restart 之后的错误信息，错误信息如下：
120917 11:41:11 mysqld_safe mysqld from pid file /usr/local/mysql/data/localhost.localdomain.pid ended
120917 11:41:12 mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql/data
120917 11:41:12 [Warning] /usr/local/mysql/bin/mysqld: ignoring option ‘–log-queries-not-using-indexes’ due to invalid value ‘/data/GKJManager/mysql_log/nouseindex.log’
120917 11:41:12 [Note] Plugin ‘FEDERATED’ is disabled.
120917 11:41:12 InnoDB: Started; log sequence number 0 46459
120917 11:41:12 [Note] Event Scheduler: Loaded 1 event
120917 11:41:12 [Note] Event Scheduler: scheduler thread started with id 1
120917 11:41:12 [Note] /usr/local/mysql/bin/mysqld: ready for connections.
Version: ‘5.1.36-log’ socket: ‘/tmp/mysql.sock’ port: 3306 MySQL Community Server (GPL)
120917 13:32:03 [Note] /usr/local/mysql/bin/mysqld: Normal shutdown
120917 13:32:03 [Note] Event Scheduler: Killing the scheduler thread, thread id 1
120917 13:32:03 [Note] Event Scheduler: Waiting for the scheduler thread to reply
120917 13:32:03 [Note] Event Scheduler: Stopped
120917 13:32:03 [Note] Event Scheduler: Purging the queue. 1 events
120917 13:32:03 InnoDB: Starting shutdown…
120917 13:32:04 InnoDB: Shutdown completed; log sequence number 0 46459
120917 13:32:04 [Warning] Forcing shutdown of 1 plugins
120917 13:32:04 [Note] /usr/local/mysql/bin/mysqld: Shutdown complete
120917 13:32:04 mysqld_safe mysqld from pid file /usr/local/mysql/data/localhost.localdomain.pid ended
120917 13:32:04 mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql/data
120917 13:32:04 [Warning] The syntax ‘–log’ is deprecated and will be removed in MySQL 7.0. Please use ‘–general_log’/’–general_log_file’ instead.
120917 13:32:04 [Warning] /usr/local/mysql/bin/mysqld: ignoring option ‘–log-queries-not-using-indexes’ due to invalid value ‘/data/GKJManager/mysql_log/nouseindex.log’
120917 13:32:04 [Note] Plugin ‘FEDERATED’ is disabled.
120917 13:32:05 InnoDB: Started; log sequence number 0 46459
/usr/local/mysql/bin/mysqld: File ‘/data/GKJManager/mysql_log/log.log’ not found (Errcode: 13)
120917 13:32:05 [ERROR] Could not use /data/GKJManager/mysql_log/log.log for logging (error 13). Turning logging off for the whole duration of the MySQL server process. To turn it on again: fix the cause, shutdown the MySQL server and restart it.
120917 13:32:05 [Note] Event Scheduler: Loaded 1 event
120917 13:32:05 [Note] Event Scheduler: scheduler thread started with id 1
120917 13:32:05 [Note] /usr/local/mysql/bin/mysqld: ready for connections.
想知道为什么没有生成其他的日志信息，有知道的麻烦回答我一下，谢谢了！！
症状是，有的机器突然就不执行这个计划任务了，求解决方法及可能原因。
show events 检查一下。另外检查
