mysql 案例 ~ mysql常见日志错误

一 简介: mysql note级别日志汇总
二错误系列
  1 Aborted connection
    1 [Note] Aborted connection 61 to db: 'unconnected' user: ‘mha’ host: ‘197.xx.xx.xx(Got an error reading communication packets)
    2 [Note] Aborted connection 61 to db: 'unconnected’' user: ‘mha’ host: ‘197.xx.xx.xx(Got timeout reading communication packets)
    分析
    1 表明因为网络中断致使的链接断开
     2 表明因为超过timeout时间致使的链接断开
  2 SLAVE多线程同步的信息
    [Note]Multi-threaded slave statistics for channel ”: seconds elapsed = 121; eventsassigned = 100374529; worker queues filled over overrun level = 0; waited due aWorker queue full = 0; waited due the total size = 0; waited at clock conflicts= 1451875661700 waited (count) when Workers occupied =     3211993 waited whenWorkers occupied = 445032386000
    分析 此信息常见于并行复制的循环打印,几乎每隔120秒，就有上述日志的输出 一般出如今slave并行复制有延迟的状况下
  3 page_cleaner线程的输出日志
   [Note] InnoDB:page_cleaner: 1000ms intended loop took 4750ms.The settings might not beoptimal. (flushed=1519 and evicted=0, during the time.)
   分析 此信息表明page_cleaner刷新比原定的循环时间next_loop_time多3000毫秒