mysql性能优化脚本mysqltuner.pl使用介绍
2024-07-24 12:41:02
供稿：网友
MySQLTuner 下载地址： MySQLTuner 使用方法： Downloading and using MySQLTuner is actually a very simple process: wget mysqltuner.pl perl mysqltuner.pl If you'd rather not invoke perl every time, just make it executable: chmod u+x mysqltuner.pl ./mysqltuner.pl » Latest development version If you want to get the bleeding edge commits, you can check out the latest code with git: git clone git://github.com/rackerhacker/MySQLTuner-perl.git 看看我的运行结果 复制代码 代码如下: >> MySQLTuner 1.1.1 - Major Hayden >> Bug reports, feature requests, and downloads at >> Run with '--help' for additional options and output filtering -------- General Statistics -------------------------------------------------- [--] Skipped version check for MySQLTuner script [OK] Currently running supported MySQL version 5.1.43-log [OK] Operating on 64-bit architecture -------- Storage Engine Statistics ------------------------------------------- [--] Status: -Archive -BDB -Federated -InnoDB -ISAM -NDBCluster [--] Data in MyISAM tables: 889M (Tables: 479) [--] Data in MEMORY tables: 1M (Tables: 4) [!!] Total fragmented tables: 29 -------- Security Recommendations ------------------------------------------- [OK] All database users have passwords assigned -------- Performance Metrics ------------------------------------------------- [--] Up for: 12h 55m 27s (4M q [105.230 qps], 295K conn, TX: 9B, RX: 546M) [--] Reads / Writes: 82% / 18% [--] Total buffers: 432.0M global + 6.3M per thread (500 max threads) [!!] Maximum possible memory usage: 3.5G (175% of installed RAM) [OK] Slow queries: 0% (48K/4M) [OK] Highest usage of available connections: 3% (16/500) [OK] Key buffer size / total MyISAM indexes: 384.0M/332.6M [OK] Key buffer hit rate: 100.0% (2B cached / 205K reads) [OK] Query cache efficiency: 49.3% (1M cached / 3M selects) [!!] Query cache prunes per day: 268042 [OK] Sorts requiring temporary tables: 0% (10 temp sorts / 122K sorts) [OK] Temporary tables created on disk: 19% (4K on disk / 22K total) [OK] Thread cache hit rate: 99% (16 created / 295K connections) [!!] Table cache hit rate: 18% (256 open / 1K opened) [OK] Open file limit used: 19% (497/2K) [!!] Table locks acquired immediately: 88% -------- Recommendations ----------------------------------------------------- General recommendations: Run OPTIMIZE TABLE to defragment tables for better performance MySQL started within last 24 hours - recommendations may be inaccurate Reduce your overall MySQL memory footprint for system stability Increase table_cache gradually to avoid file descriptor limits Optimize queries and/or use InnoDB to reduce lock wait Variables to adjust: *** MySQL's maximum memory usage is dangerously high *** *** Add RAM before increasing MySQL buffer variables *** query_cache_size (> 32M) table_cache (> 256)
