memory_summary_by_host_by_event_name 详解

系统表介绍

memory_summary_by_host_by_event_name 记录了事件对内存的使用,按照客户端IP与事件进行分组统计.

列名	含义
HOST	客户端IP
EVENT_NAME	事件名
COUNT_ALLOC	内存分配次数
COUNT_FREE	内存释放次数
SUM_NUMBER_OF_BYTES_ALLOC	总内存分配大小
SUM_NUMBER_OF_BYTES_FREE	总内存释放大小
LOW_COUNT_USED	当前持有的内存块数量
CURRENT_COUNT_USED	持有内存块的低水位线
HIGH_COUNT_USED	持有内存块的高水位线
LOW_NUMBER_OF_BYTES_USED	持有内存字节数的低水位线
CURRENT_NUMBER_OF_BYTES_USED	当前持有内存的数量
HIGH_NUMBER_OF_BYTES_USED	持有内存字节数的高水位线

实例

mysql>  select * from memory_summary_by_host_by_event_name   order by CURRENT_NUMBER_OF_BYTES_USED desc  limit 2 \G;
*************************** 1. row ***************************
                        HOST: 192.168.2.1
                  EVENT_NAME: memory/sql/String::value
                 COUNT_ALLOC: 3410
                  COUNT_FREE: 3340
   SUM_NUMBER_OF_BYTES_ALLOC: 1685184
    SUM_NUMBER_OF_BYTES_FREE: 1445528
              LOW_COUNT_USED: 0
          CURRENT_COUNT_USED: 70
             HIGH_COUNT_USED: 86
    LOW_NUMBER_OF_BYTES_USED: 0
CURRENT_NUMBER_OF_BYTES_USED: 239656
   HIGH_NUMBER_OF_BYTES_USED: 630072
*************************** 2. row ***************************
                        HOST: localhost
                  EVENT_NAME: memory/sql/String::value
                 COUNT_ALLOC: 1659
                  COUNT_FREE: 1615
   SUM_NUMBER_OF_BYTES_ALLOC: 414808
    SUM_NUMBER_OF_BYTES_FREE: 226016
              LOW_COUNT_USED: 0
          CURRENT_COUNT_USED: 44
             HIGH_COUNT_USED: 52
    LOW_NUMBER_OF_BYTES_USED: 0
CURRENT_NUMBER_OF_BYTES_USED: 188792
   HIGH_NUMBER_OF_BYTES_USED: 262656
2 rows in set (0.01 sec)