问题描述
我是具有6GB RAM的服务器上的MySQL.我需要知道myisam_sort_buffer_size和sort_buffer_size有什么区别吗?
I am MySQL on server with 6GB RAM. I need to know what is the difference between myisam_sort_buffer_size and sort_buffer_size?
我为他们设置了以下尺寸:
I have following size set to them:
myisam_sort_buffer_size = 8M
myisam_sort_buffer_size = 8M
sort_buffer_size = 256M
sort_buffer_size = 256M
请还提及这些值是否合适或需要调整?
Please also mention if these values are fine or need adjustments?
谢谢
推荐答案
sort_buffer_size:
MySQL文档:
您的sort_buffer_size值似乎很高.默认值为2M.我建议不要超过此值，因为提高性能会降低性能. 有人建议使用较小的值，例如256kB.要记住的一件事是，这是每个客户端会话，不是全局值.较大的值将快速累加.
Your sort_buffer_size value seems extremely high. The default is 2M. I'd recommend going no larger than that since there is a performance penalty for going higher. Some people recommend smaller values such as 256kB. One thing to remember is this is per-client-session, it's not a global value. Large values will add up fast.
myisam_sort_buffer_size:
MySQL文档:
您的myisam_sort_buffer_size看起来不错.除非您要使用ALTER TABLE或REPAIR TABLE等重建索引，否则这将无关紧要.
Your myisam_sort_buffer_size seems fine. This won't be relevant unless you are rebuilding indexes using ALTER TABLE or REPAIR TABLE etc.
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