16GB RAMサーバーでのMySQLの最適化

Question

私にはCentOS 6.5 VMと16 GB RAMがあります。

私はMySQLのかなり遅い応答を感じ、私はMySQLTunerスクリプトを実行した、と私はパフォーマンスを向上させるために、私のmy.cnyの設定ファイルに変更を加えることができますどのように与えられた勧告からきましたか？

ここでは、最後のMySQLの再起動後に2日間の結果、次のとおりです。

[--] 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. 

、これが私のmy.cny

[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 

感謝です！

Answer 1

@ user3659206設定リクエストは非常に極端です。あなたは次の4行の前に＃を置くならば28Mは、デフォルト 2でなければなりません= innodb_log_files_in_group（ので、システムはデフォルト値を使用しています） # sort_buffer_size = 128M # read_buffer_size = 64M # read_rnd_buffer_size = 128M # join_buffer_size = 128M あなたは驚かれることでしょう。シャットダウン/再起動後。

mysqlcalculator.comを使用して、現在の設定が、要求した値で82GBを使用する準備ができていることを確認します。

mysqltunerをもう一度実行すると、メモリフットプリントが縮小されます。
新しいmysqltunerを投稿してください。皆さんの進歩を認識できるようにしてください。