16gbram服务器中的MySQL优化

我有一个CentOS6.5VM和16GB内存

我觉得MySQL的响应非常慢，我已经运行了MySQLTuner脚本，根据给出的建议，我如何更改my.cny配置文件以提高性能

以下是上次MySQL重启2天后的结果：

[--] Skipped version check for MySQLTuner script
running supported MySQL version 5.7.17-log
[OK] Operating on 64-bit architecture

-------- Storage Engine Statistics -----------------------------------------------------------------
[--] Status: +ARCHIVE +BLACKHOLE +CSV -FEDERATED +InnoDB +MEMORY +MRG_MYISAM +MyISAM +PERFORMANCE_SCHEMA
[--] Data in InnoDB tables: 111M (Tables: 88)
[OK] Total fragmented tables: 0

-------- Performance Metrics -----------------------------------------------------------------------
[--] Up for: 1d 20h 44m 5s (178K q [1.111 qps], 20K conn, TX: 260M, RX: 24M)
[--] Reads / Writes: 84% / 16%
[--] Binary logging is enabled (GTID MODE: OFF)
[--] Physical Memory     : 15.5G
[--] Max MySQL memory    : 76.2G
[--] Other process memory: 40.8M
[--] Total buffers: 10.1G global + 448.2M per thread (151 max threads)
[--] P_S Max memory usage: 72B
[--] Galera GCache Max memory usage: 0B
[!!] Maximum reached memory usage: 19.3G (124.21% of installed RAM)
[!!] Maximum possible memory usage: 76.2G (490.99% of installed RAM)
[!!] Overall possible memory usage with other process exceeded memory
[OK] Slow queries: 0% (0/178K)
[OK] Highest usage of available connections: 13% (21/151)
[OK] Aborted connections: 0.04%  (8/20336)
[OK] Query cache is disabled by default due to mutex contention on multiprocessor machines.
[OK] Sorts requiring temporary tables: 0% (0 temp sorts / 4K sorts)
[OK] No joins without indexes
[OK] Temporary tables created on disk: 24% (420 on disk / 1K total)
[OK] Thread cache hit rate: 93% (1K created / 20K connections)
[OK] Table cache hit rate: 21% (416 open / 1K opened)
[OK] Open file limit used: 0% (3/1K)
[OK] Table locks acquired immediately: 100% (167 immediate / 167 locks)
[OK] Binlog cache memory access: 100.00% (4605 Memory / 4605 Total)

-------- Performance schema ------------------------------------------------------------------------
[--] Memory used by P_S: 72B
[--] Sys schema is installed.

-------- MyISAM Metrics ----------------------------------------------------------------------------
[!!] Key buffer used: 18.2% (3M used / 16M cache)
[OK] Key buffer size / total MyISAM indexes: 16.0M/43.0K
[!!] Read Key buffer hit rate: 85.5% (62 cached / 9 reads)

-------- InnoDB Metrics ----------------------------------------------------------------------------
[--] InnoDB is enabled.
[--] InnoDB Thread Concurrency: 0
[OK] InnoDB File per table is activated
[OK] InnoDB buffer pool / data size: 10.0G/111.5M
[OK] InnoDB log file size / InnoDB Buffer pool size: 28.0M * 100/10.0G should be equal 25%
[OK] InnoDB buffer pool instances: 10
[--] Number of InnoDB Buffer Pool Chunk : 80 for 10 Buffer Pool Instance(s)
[OK] Innodb_buffer_pool_size aligned with Innodb_buffer_pool_chunk_size & Innodb_buffer_pool_instances
[OK] InnoDB Read buffer efficiency: 99.99% (41669876 hits/ 41674787 total)
[!!] InnoDB Write Log efficiency: 34.26% (17312 hits/ 50528 total)
[OK] InnoDB log waits: 0.00% (0 waits / 33216 writes)

-------- Replication Metrics -----------------------------------------------------------------------
[--] Galera Synchronous replication: NO
[--] This server is acting as master for 1 server(s).
[--] No replication setup for this server.

-------- Recommendations ---------------------------------------------------------------------------
General recommendations:
Control warning line(s) into /var/log/mysqld-error.log file
Control error line(s) into /var/log/mysqld-error.log file
Reduce your overall MySQL memory footprint for system stability
Dedicate this server to your database for highest performance.

这是我的人民币

[mysqld]
innodb_buffer_pool_size = 10G
innodb_log_file_size = 28M
innodb_log_files_in_group = 28M
innodb_buffer_pool_instances=10
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
binlog_cache_size = 32M
key_buffer_size = 16M
table_open_cache = 64M
sort_buffer_size = 128M
read_buffer_size = 64M
read_rnd_buffer_size = 128M
join_buffer_size = 128M
myisam_sort_buffer_size = 32M
thread_cache_size = 4
query_cache_size= 32M
query_cache_limit = 1M
log-error=/var/log/mysqld-error.log
pid-file=/var/run/mysqld/mysqld.pid
skip-name-resolve
symbolic-links=0

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谢谢

@user3659206您的配置请求非常极端。 innodb_log_files_in_group=28M应为2，默认值 如果将#放在接下来的4行前面（因此系统使用默认值）

#排序缓冲区大小=128M

#读取缓冲区大小=64M

#读取缓冲区大小=128M

\join\u buffer\u size=128M

你会惊讶的。关闭/重新启动后

使用mysqlcalculator.com查看您当前的配置是否已准备好将82GB与您请求的值一起使用

再次运行mysqltuner以查看减少的内存占用。

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请发布您的新mysqltuner，以便我们都能识别您的进度。

也许应该询问此问题，以获取更多答案，请按照中的建议进行慢记和调整。是否完成了my.cnf更改？它没有，请考虑9月5日，17的答案，并考虑这个变化，NuiBudBuffelyPoLosiSosig＝1G，从10G支持少于120米的数据，该服务器只有16GB RAM，在7天的正常运行时间后，请重新发布完整的MySqtUnER报告并完成My.CNF。