MySQL Optimisation advice

Irksome73

• September 17, 2014 11:33

Please may I have some optimisation advice on the following MySQL Tuner report : Server specs : Dual AMD Opteron @ 2.1GHz with 4GB RAM >> MySQLTuner 1.3.0 - Major Hayden >> Bug reports, feature requests, and downloads at http://mysqltuner.com/ >> Run with '--help' for additional options and output filtering [OK] Currently running supported MySQL version 5.5.37-cll [OK] Operating on 64-bit architecture -------- Storage Engine Statistics ------------------------------------------- [--] Status: +ARCHIVE +BLACKHOLE +CSV -FEDERATED +InnoDB +MRG_MYISAM [--] Data in MyISAM tables: 690M (Tables: 396) [--] Data in InnoDB tables: 760M (Tables: 3549) [--] Data in PERFORMANCE_SCHEMA tables: 0B (Tables: 17) [!!] Total fragmented tables: 144 -------- Security Recommendations ------------------------------------------- [OK] All database users have passwords assigned -------- Performance Metrics ------------------------------------------------- [--] Up for: 6d 8h 50m 58s (15M q [27.783 qps], 214K conn, TX: 48B, RX: 2B) [--] Reads / Writes: 74% / 26% [--] Total buffers: 168.0M global + 2.8M per thread (151 max threads) [OK] Maximum possible memory usage: 583.2M (15% of installed RAM) [OK] Slow queries: 0% (78/15M) [OK] Highest usage of available connections: 70% (107/151) [!!] Key buffer size / total MyISAM indexes: 8.0M/170.2M [!!] Key buffer hit rate: 93.1% (26M cached / 1M reads) [OK] Query cache efficiency: 79.0% (10M cached / 13M selects) [!!] Query cache prunes per day: 263687 [OK] Sorts requiring temporary tables: 0% (68 temp sorts / 435K sorts) [OK] Temporary tables created on disk: 20% (106K on disk / 525K total) [!!] Thread cache is disabled [!!] Table cache hit rate: 0% (400 open / 15M opened) [OK] Open file limit used: 3% (373/11K) [OK] Table locks acquired immediately: 99% (4M immediate / 4M locks) [!!] InnoDB buffer pool / data size: 118.0M/760.4M [OK] InnoDB log waits: 0 -------- Recommendations ----------------------------------------------------- General recommendations: Run OPTIMIZE TABLE to defragment tables for better performance 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: http://bit.ly/1mi7c4C Variables to adjust: key_buffer_size (> 170.2M) query_cache_size (> 10M) thread_cache_size (start at 4) table_open_cache (> 400) innodb_buffer_pool_size (>= 760M)
and my.cnf cat my.cnf [mysqld] innodb_file_per_table=1 open_files_limit=11790 log-slow-queries="/var/lib/mysql/slow.log" max_allowed_packet=268435456 innodb_buffer_pool_size=123731968 query_cache_size=10485760
MTIA

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  cPanelMichael

  • September 17, 2014 17:03

  Hello :) Sometimes it's helpful to provide information about what lead you to seeking assistance with optimization. Are you experiencing a specific issue with speed, or is it simply a matter of wanting to optimize the performance the most you can? Thank you.

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  Irksome73

  • September 17, 2014 18:36

  Dear Micheal, Yes indeed I quite understand. Some of the sites hosted on this VM are very peaky - they go from little traffic to relatively large amounts for short spaces of time (5-10 mins). We're finding the load averages are getting very very high - I saw 80+ today! The code of these sites appears very sub-optimal - I don't think the client has undertaken any optimisation, and therefore there seem to be very large numbers of SQL hits - I want to ensure that the SQL performance is optimised for the websites we host so that I can convince the client to optimise the website code. Of course they don't want to pay for further resources!

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