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MySQL Server has gone away ??????????????????????????

1. MySQL ???????

??????? MySQL ?????????

• ???????????????MySQL??????

  mysql -uroot -p -e "SHOW GLOBAL STATUS LIKE 'uptime'"

  ????? uptime ???????MySQL???????????????????

• ????????MySQL??????????????????

  tail /var/log/mysql/error.log

  ???????????MySQL????????

2. ?????

????????????????????????MySQL server has gone away ???

• ???????MySQL???????????????

  mysql -uroot -p -e "SHOW GLOBAL VARIABLES LIKE '%timeout%;'"

  ?????

  • connect_timeout: 30?
  • interactive_timeout: 28800?
  • wait_timeout: 28800?
  • innodb_lock_wait_timeout: 50?
• ???????

  mysql -uroot -p -e "SET SESSION wait_timeout=5; SELECT NOW()"

  ??????????????????

3. ??? server ? kill

????????? server ??? kill ????????????

• ??????????? kill ????

  mysql -uroot -p -e "SHOW GLOBAL STATUS LIKE 'com_kill'"

  ?? com_kill ??? 0?????????? kill?

4. SQL ???????

? SQL ?????????? max_allowed_packet ??????????

• ??????? max_allowed_packet ???

  mysql -uroot -p -e "SHOW GLOBAL VARIABLES LIKE 'max_allowed_packet'"

  ??????????????????

  mysql -uroot -p -e "SET GLOBAL max_allowed_packet=16777216;"

  ?????????????????????

5. ??????

???????????????????

• ????????? pinging MySQL ???????????????????????

??

MySQL Server has gone away ?????????????????? kill ? SQL ???????????????????????????

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