mysql如何查看缓冲池命中率
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方法一：
mysql> show engine innodb status\G;
*************************** 1. row ***************************
Type: InnoDB
Name:
Status:
=====================================
2016-06-07 09:40:38 7f593136f700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 6 seconds #以下信息是最近6秒的平均值
.............................................
.............................................
Buffer pool size 393208
Buffer pool size, bytes 6442319872
Free buffers 8807
Database pages 373575
Old database pages 137869
Modified db pages 43
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 1132357, not young 92318292
2.33 youngs/s, 2496.75 non-youngs/s
Pages read 2127203, created 1317816, written 1762250
18.00 reads/s, 3.83 creates/s, 14.33 writes/s
Buffer pool hit rate 998 / 1000, young-making rate 0 / 1000 not 314 / 1000 #缓冲池命中率
结果：最近6秒缓冲池命中率是99.8%
方法二：
mysql> show global status like 'innodb%read%';
+---------------------------------------+-------------+
| Variable_name | Value |
+---------------------------------------+-------------+
| Innodb_buffer_pool_read_ahead_rnd | 0 |
| Innodb_buffer_pool_read_ahead | 839015 | #预读次数
| Innodb_buffer_pool_read_ahead_evicted | 0 |
| Innodb_buffer_pool_read_requests | 1497697965 | #从缓冲池中读取页的次数
| Innodb_buffer_pool_reads | 1227641 | #从物理磁盘读取页的次数
| Innodb_data_pending_reads | 0 |
| Innodb_data_read | 34861846528 | #总共读入的字节数
| Innodb_data_reads | 2128711 | #总共读取的次数
| Innodb_master_thread_active_loops | 63667 |
| Innodb_master_thread_idle_loops | 24896 |
| Innodb_pages_read | 2127692 |
| Innodb_rows_read | 803908452 |
| Innodb_read_views_memory | 2176 |
+---------------------------------------+-------------+
13 rows in set (0.00 sec)
缓冲池命中率= Innodb_buffer_pool_read_requests/（Innodb_buffer_pool_read_requests+Innodb_buffer_pool_reads+Innodb_buffer_pool_read_ahead）=1497697965/(1497697965+1227641+839015)=99.85%
平均读取的字节数=Innodb_data_read/ Innodb_data_reads=16376
可以看出系统的内存使用效率还是很高的
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