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  • MySQL 内存和CPU优化相关的参数

    mysql> SHOW GLOBAL STATUS LIKE 'innodb%read%';
    +---------------------------------------+---------+
    | Variable_name                         | Value   |
    +---------------------------------------+---------+
    | Innodb_buffer_pool_read_ahead_rnd     | 0       |
    | Innodb_buffer_pool_read_ahead         | 0       |
    | Innodb_buffer_pool_read_ahead_evicted | 0       |
    | Innodb_buffer_pool_read_requests      | 612     |
    | Innodb_buffer_pool_reads              | 179     |
    | Innodb_data_pending_reads             | 0       |
    | Innodb_data_read                      | 5115904 |
    | Innodb_data_reads                     | 189     |
    | Innodb_pages_read                     | 178     |
    | Innodb_rows_read                      | 0       |
    +---------------------------------------+---------+
    10 rows in set (0.00 sec)
    
    #多核CPU
    innodb_read_io_threads
    innodb_write_io_threads
    
    #内存
    缓冲池命中率=
    Innodb_buffer_pool_read_requests/(
    Innodb_buffer_pool_read_requests+Innodb_buffer_pool_read_ahead+Innodb_buffer_pool_reads)
    平均每次读取字节数
    Innodb_data_read/Innodb_data_reads
    
    Innodb_data_reads:表示从物理磁盘读取页的次数
    Innodb_buffer_pool_read_ahead:预读的次数
    Innodb_buffer_pool_read_ahead_evicted:预读的页,但是没有被读取就从缓冲池中被替换的页的数量,一般用来判断预读的频率
    Innodb_buffer_pool_read_requests:从缓冲池中读取页的次数
    Innodb_data_read:一共读取的字节数
    Innodb_data_reads:发起读取请求的次数,每次读取可能需要读取多个页
    

      

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  • 原文地址:https://www.cnblogs.com/xiaoit/p/4551676.html
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