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知乎专栏多维度架构

第 27 章 Optimization

目录

27.1. Limit 状态
27.2. 使用 Btrfs 文件系统存储mysql数据
27.3. 打开表的数量
27.4. Buffering and Caching
27.4.1. Query Cache SELECT Options
27.5. where 优化
27.6. SHOW PROFILE Syntax SQL性能分析器
27.7. PROCEDURE ANALYSE()

27.1. Limit 状态

		
$ sudo cat /proc/`pidof mysqld`/limits
Limit                     Soft Limit           Hard Limit           Units     
Max cpu time              unlimited            unlimited            seconds   
Max file size             unlimited            unlimited            bytes     
Max data size             unlimited            unlimited            bytes     
Max stack size            10485760             unlimited            bytes     
Max core file size        0                    unlimited            bytes     
Max resident set          unlimited            unlimited            bytes     
Max processes             62662                62662                processes 
Max open files            20480                20480                files     
Max locked memory         65536                65536                bytes     
Max address space         unlimited            unlimited            bytes     
Max file locks            unlimited            unlimited            locks     
Max pending signals       62662                62662                signals   
Max msgqueue size         819200               819200               bytes     
Max nice priority         0                    0                    
Max realtime priority     0                    0                    
Max realtime timeout      unlimited            unlimited            us