【发布时间】：2015-05-12 23:59:53
【问题描述】：
MySQLTuner 中的建议 嗨，我已经运行了 MySQLTuner - perl，我采取了
安全建议
Warning: Using unique option prefix pass instead of password is deprecated and will be removed in a future release. Please use the full name instead.
[OK] All database users have passwords assigned
Warning: Using unique option prefix pass instead of password is deprecated and will be removed in a future release. Please use the full name instead.
性能指标
[--] Up for: 22m 28s (463K q [344.006 qps], 1K conn, TX: 857M, RX: 90M)
[--] Reads / Writes: 99% / 1%
[--] Total buffers: 168.0M global + 2.8M per thread (151 max threads)
[OK] Maximum possible memory usage: 583.2M (1% of installed RAM)
[OK] Slow queries: 0% (0/463K)
[OK] Highest usage of available connections: 12% (19/151)
[OK] Key buffer size / total MyISAM indexes: 8.0M/146.0M
[OK] Key buffer hit rate: 100.0% (184M cached / 55K reads)
[!!] Query cache is disabled
[OK] Sorts requiring temporary tables: 0% (34 temp sorts / 738K sorts)
[!!] Joins performed without indexes: 543
[OK] Temporary tables created on disk: 23% (30K on disk / 131K total)
[!!] Thread cache is disabled
[!!] Table cache hit rate: 0% (400 open / 58K opened)
[OK] Open file limit used: 0% (759/500K)
[OK] Table locks acquired immediately: 99% (842K immediate / 842K locks)
[OK] InnoDB buffer pool / data size: 128.0M/92.3M
[OK] InnoDB log waits: 0
建议
Run OPTIMIZE TABLE to defragment tables for better performance
MySQL started within last 24 hours - recommendations may be inaccurate
Enable the slow query log to troubleshoot bad queries
Adjust your join queries to always utilize indexes
Set thread_cache_size to 4 as a starting value
Increase table_open_cache gradually to avoid file descriptor limits
Read this before increasing table_open_cache over 64:
要调整的变量：
query_cache_size (>= 8M)
join_buffer_size (> 128.0K, or always use indexes with joins)
thread_cache_size (start at 4)
table_open_cache (> 400)
服务器运行 48gb 和 i7 cpu 在 my.cnf 我有
[mysqld]
max_allowed_packet=268435456
open_files_limit=500000
local-infile=0
有什么建议吗？
【问题讨论】：
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关于什么的建议？您从该工具中获得了很多建议。你有什么问题？
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是的，建议是“不要使用调整脚本”。使用默认值，除非您有特定的理由要更改它们。只改变你理解的价值观，一次只改变一件事。
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附加信息请求。在 pastebin.com 上发布并分享链接。文本结果： B) SHOW GLOBAL STATUS；至少 24 小时正常运行时间后 C) 显示全局变量； D) 显示完整的处理程序； E) 完成 MySQLTuner 报告 F) SHOW ENGINE INNODB STATUS；和 可选的非常有用的信息，如果可用，包括 - htop 或 top 或 mytop 用于大多数活动应用程序，ulimit -a 用于 linux/unix 限制列表，iostat -xm 5 3 用于按设备和核心/cpu 计数的 IOPS，用于服务器工作负载调整分析。
标签： mysql mysqltuner