概要
- mysqltunerは、MySQLの統計情報を使ってパフォーマンスチューニングのアドバイスをしてくれる。
- 最近はCVE（セキュリティ情報）も教えてくれるみたい。
- 調べた背景は、64GBのRAMが載ったApacheやbatchプログラムが共存したEC2インスタンスに48GBも
innodb_buffer_poolを盲目的に割り当てたベンダーが居て、それってどうなのよ？と思った。ベンダーに丸投げって怖いな。- 案の定、「2周間後にメモリが100％になりそうになってOOM Killerが発動されてmysqlが落ちるよ」と3回ぐらい警告したら設定値を変更してくれた。
インストール
cd /tmp wget https://github.com/major/MySQLTuner-perl/zipball/master unzip master cd major-MySQLTuner-perl-b828a6e/ ./mysqltuner.pl
実行
自分のサーバはどうなんだろうと思って実行してみたけど、まぁ、適当に設定している割には良い感じ。
[OK] Currently running supported MySQL version 5.7.18-log [OK] Operating on 64-bit architecture -------- Log file Recommendations ------------------------------------------------------------------ [--] Log file: /usr/local/var/mysql/teraren.local.err(0B) [!!] Log file /usr/local/var/mysql/teraren.local.err doesn't exist [!!] Log file /usr/local/var/mysql/teraren.local.err isn't readable. -------- Storage Engine Statistics ----------------------------------------------------------------- [--] Status: +ARCHIVE +BLACKHOLE +CSV -FEDERATED +InnoDB +MEMORY +MRG_MYISAM +MyISAM +PERFORMANCE_SCHEMA [--] Data in InnoDB tables: 15G (Tables: 490) [--] Data in MyISAM tables: 60M (Tables: 161) [!!] Total fragmented tables: 1 -------- Security Recommendations ------------------------------------------------------------------ [OK] There are no anonymous accounts for any database users [OK] All database users have passwords assigned [!!] User 'tel@%' hasn't specific host restriction. [--] There are 612 basic passwords in the list. -------- CVE Security Recommendations -------------------------------------------------------------- [OK] NO SECURITY CVE FOUND FOR YOUR VERSION -------- Performance Metrics ----------------------------------------------------------------------- [--] Up for: 60d 2h 32m 18s (124M q [23.963 qps], 1M conn, TX: 409G, RX: 16G) [--] Reads / Writes: 91% / 9% [--] Binary logging is enabled (GTID MODE: OFF) [--] Physical Memory : 8.0G [--] Max MySQL memory : 496.0M [--] Other process memory: 6.3G [--] Total buffers: 424.0M global + 1.1M per thread (64 max threads) [--] P_S Max memory usage: 72B [--] Galera GCache Max memory usage: 0B [OK] Maximum reached memory usage: 430.8M (5.26% of installed RAM) [OK] Maximum possible memory usage: 496.0M (6.05% of installed RAM) [OK] Overall possible memory usage with other process is compatible with memory available [OK] Slow queries: 0% (66/124M) [OK] Highest usage of available connections: 9% (6/64) [OK] Aborted connections: 0.00% (4/1550671) [!!] name resolution is active : a reverse name resolution is made for each new connection and can reduce performance [!!] Query cache may be disabled by default due to mutex contention. [OK] Query cache efficiency: 74.9% (81M cached / 109M selects) [!!] Query cache prunes per day: 100750 [OK] Sorts requiring temporary tables: 0% (4K temp sorts / 3M sorts) [OK] No joins without indexes [!!] Temporary tables created on disk: 30% (2M on disk / 6M total) [OK] Thread cache hit rate: 99% (6 created / 1M connections) [!!] Table cache hit rate: 19% (1K open / 9K opened) [OK] Open file limit used: 0% (323/65K) [OK] Table locks acquired immediately: 99% (985K immediate / 986K locks) [OK] Binlog cache memory access: 99.93% (2455619 Memory / 2457387 Total) -------- Performance schema ------------------------------------------------------------------------ [--] Memory used by P_S: 72B [--] Sys schema is installed. -------- ThreadPool Metrics ------------------------------------------------------------------------ [--] ThreadPool stat is disabled. -------- MyISAM Metrics ---------------------------------------------------------------------------- [!!] Key buffer used: 19.9% (1M used / 8M cache) [OK] Key buffer size / total MyISAM indexes: 8.0M/4.2M [OK] Read Key buffer hit rate: 100.0% (8M cached / 134 reads) [OK] Write Key buffer hit rate: 99.3% (462K cached / 458K writes) -------- InnoDB Metrics ---------------------------------------------------------------------------- [--] InnoDB is enabled. [--] InnoDB Thread Concurrency: 0 [OK] InnoDB File per table is activated [!!] InnoDB buffer pool / data size: 256.0M/15.5G [!!] Ratio InnoDB log file size / InnoDB Buffer pool size (37.5 %): 48.0M * 2/256.0M should be equal 25% [OK] InnoDB buffer pool instances: 1 [--] Number of InnoDB Buffer Pool Chunk : 2 for 1 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: 99.91% (53923725522 hits/ 53974926093 total) [!!] InnoDB Write Log efficiency: 66.99% (7965306 hits/ 11890918 total) [OK] InnoDB log waits: 0.00% (0 waits / 3925612 writes) -------- AriaDB Metrics ---------------------------------------------------------------------------- [--] AriaDB is disabled. -------- TokuDB Metrics ---------------------------------------------------------------------------- [--] TokuDB is disabled.
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