MySql Opmimzation

Legin76

• June 05, 2014 11:15

Hi I've been trying to optimise my server. It has two 2GHz processors and 4gb of ram on CentOS 5.10 with 2.6.18-371.8.1.el5PAE I've kept the join_buffer_size at 256K as I read that it was not good to have it to high but set key_buffer_size = 256M to compensate. I also tried to avoid increasing query_cache_size to much but I MySQLTuner still seems to thing I needs more. What should I be setting to get the best out of it? [mysqld] set-variable = max_connections=500 safe-show-database set-variable = max_allowed_packet=16M local-infile=0 open_files_limit=19990 query_cache_size = 128M query_cache_limit = 16M join_buffer_size = 256K key_buffer_size = 256M thread_cache_size = 16 table_cache = 64 innodb_buffer_pool_size = 120M innodb_log_buffer_size = 4M
root@srv04 [~]# perl mysqltuner.pl >> 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 5.1.73-cll [!!] Switch to 64-bit OS - MySQL cannot currently use all of your RAM -------- Storage Engine Statistics ------------------------------------------- [--] Status: +ARCHIVE +BLACKHOLE +CSV -FEDERATED +InnoDB +MRG_MYISAM [--] Data in MyISAM tables: 1G (Tables: 2451) [--] Data in InnoDB tables: 88M (Tables: 418) [--] Data in MEMORY tables: 126K (Tables: 6) [!!] Total fragmented tables: 454 -------- Security Recommendations ------------------------------------------- [OK] All database users have passwords assigned -------- Performance Metrics ------------------------------------------------- [--] Up for: 1d 15h 17m 1s (8M q [59.379 qps], 159K conn, TX: 15B, RX: 1B) [--] Reads / Writes: 76% / 24% [--] Total buffers: 525.0M global + 2.8M per thread (500 max threads) [OK] Maximum possible memory usage: 1.9G (47% of installed RAM) [OK] Slow queries: 0% (67/8M) [OK] Highest usage of available connections: 13% (66/500) [OK] Key buffer size / total MyISAM indexes: 256.0M/210.3M [OK] Key buffer hit rate: 99.0% (102M cached / 1M reads) [OK] Query cache efficiency: 75.1% (5M cached / 7M selects) [!!] Query cache prunes per day: 434558 [OK] Sorts requiring temporary tables: 0% (75 temp sorts / 616K sorts) [!!] Joins performed without indexes: 1617 [OK] Temporary tables created on disk: 23% (118K on disk / 510K total) [OK] Thread cache hit rate: 99% (102 created / 159K connections) [!!] Table cache hit rate: 0% (64 open / 2M opened) [OK] Open file limit used: 0% (124/19K) [OK] Table locks acquired immediately: 99% (2M immediate / 2M locks) [OK] InnoDB buffer pool / data size: 120.0M/88.7M [OK] InnoDB log waits: 0 -------- Recommendations ----------------------------------------------------- General recommendations: Run OPTIMIZE TABLE to defragment tables for better performance Enable the slow query log to troubleshoot bad queries Adjust your join queries to always utilize indexes Increase table_cache gradually to avoid file descriptor limits Read this before increasing table_cache over 64: http://bit.ly/1mi7c4C Variables to adjust: query_cache_size (> 128M) join_buffer_size (> 256.0K, or always use indexes with joins) table_cache (> 64)

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  cPanelMichael

  • June 05, 2014 16:18

  Hello :) You could try increasing the values as suggested by the MySQL tuner. However, overall, are you experiencing issues with slowness with MySQL, or are you simply trying to optimize performance as best as possible? Thank you.

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  Legin76

  • June 05, 2014 16:25

  Hi I had some issues so have increased the ram and set up PAE to get the most out of it. Now I'm just trying to get the best possible. [COLOR="silver">- - - Updated - - - table_cache was getting really high, but when I read the info on it I thought that I may be better off keeping that at 64.

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