shell脚本定时清理mysql表空间和logs数据清空

1、需求

线下开发机器数据log表数据增长很快，机器磁盘空间经常满，导致问题，现需要写个crontab脚本定时清理表数据。

2、定时任务添加

crontab -e

*/1 * * * * source /etc/profile; sh /Data/apps/clean_db.sh >> /tmp/crontab.log 2>&1

3、clean_db.sh

#!/bash/bin
# execute sql stat
mysql -h10.1.210.168 -uadmin -pswh123456 -e use cachecloud;truncate table standard_statistics

4、执行报错

/Data/apps/clean_db.sh: line 3: mysql: command not found

解决1：注意是因为crontab环境变量没有导入

*/1 * * * * source /etc/profile; sh /Data/apps/clean_db.sh >> /tmp/crontab.log 2>&1

解决2：shell脚本mysql命令写全路径

5、SQL语句直接嵌入到shell脚本

--演示环境
[root@SZDB ~]# more /etc/issue
CentOS release 5.9 (Final)
Kernel 
 on an m
 
root@localhost[(none)]> show variables like version;
+---------------+------------+
| Variable_name | Value      |
+---------------+------------+
| version       | 5.6.12-log |
+---------------+------------+
 
[root@SZDB ~]# more shell_call_sql1.sh 
#!/bin/bash
# Define log
TIMESTAMP=`date +%Y%m%d%H%M%S`
LOG=call_sql_${TIMESTAMP}.log
echo "Start execute sql statement at `date`." >>${LOG}
# execute sql stat
mysql -uroot -p123456 -e "
tee /tmp/temp.log
drop database if exists tempdb;
create database tempdb;
use tempdb
create table if not exists tb_tmp(id smallint,val varchar(20));
insert into tb_tmp values (1,jack),(2,robin),(3,mark);
select * from tb_tmp;
notee
quit"
 
echo -e "
">>${LOG}
echo "below is output result.">>${LOG}
cat /tmp/temp.log>>${LOG}
echo "script executed successful.">>${LOG}
exit;
 
[root@SZDB ~]# ./shell_call_sql1.sh 
Logging to file /tmp/temp.log
+------+-------+
| id   | val   |
+------+-------+
|    1 | jack  |
|    2 | robin |
|    3 | mark  |
+------+-------+
Outfile disabled.
--Author : Leshami
--Blog   : http://blog..net/leshami

6、清理日志脚本：clean_log.sh

#!/bash/bin
# execute sql stat
for log in `find /Data/apps/ -name *.log`
do
`echo  > $log`
done