-- MYSQL PERFORMANCE TUNING PRIMER -- - By: Matthew Montgomery - MySQL Version 5.0.92-community i686 Uptime = 0 days 1 hrs 2 min 35 sec Avg. qps = 165 Total Questions = 622172 Threads Connected = 3 Warning: Server has not been running for at least 48hrs. It may not be safe to use these recommendations To find out more information on how each of these runtime variables effects performance visit: http://dev.mysql.com/doc/refman/5.0/en/server-system-variables.html Visit http://www.mysql.com/products/enterprise/advisors.html for info about MySQL's Enterprise Monitoring and Advisory Service SLOW QUERIES The slow query log is NOT enabled. Current long_query_time = 4 sec. You have 1 out of 622214 that take longer than 4 sec. to complete Your long_query_time seems to be fine BINARY UPDATE LOG The binary update log is NOT enabled. You will not be able to do point in time recovery See http://dev.mysql.com/doc/refman/5.0/en/point-in-time-recovery.html WORKER THREADS Current thread_cache_size = 200 Current threads_cached = 21 Current threads_per_sec = 0 Historic threads_per_sec = 0 Your thread_cache_size is fine MAX CONNECTIONS Current max_connections = 600 Current threads_connected = 1 Historic max_used_connections = 22 The number of used connections is 3% of the configured maximum. You are using less than 10% of your configured max_connections. Lowering max_connections could help to avoid an over-allocation of memory See "MEMORY USAGE" section to make sure you are not over-allocating INNODB STATUS Current InnoDB index space = 224 K Current InnoDB data space = 160 K Current InnoDB buffer pool free = 90 % Current innodb_buffer_pool_size = 8 M Depending on how much space your innodb indexes take up it may be safe to increase this value to up to 2 / 3 of total system memory MEMORY USAGE Max Memory Ever Allocated : 1.79 G Configured Max Per-thread Buffers : 20.61 G Configured Max Global Buffers : 1.04 G Configured Max Memory Limit : 21.65 G Physical Memory : 3.95 G nMax memory limit exceeds 90% of physical memory KEY BUFFER Current MyISAM index space = 110 M Current key_buffer_size = 32 M Key cache miss rate is 1 : 206 Key buffer free ratio = 48 % Your key_buffer_size seems to be too high. Perhaps you can use these resources elsewhere QUERY CACHE Query cache is enabled Current query_cache_size = 1.00 G Current query_cache_used = 17 M Current query_cache_limit = 512 M Current Query cache Memory fill ratio = 1.70 % Current query_cache_min_res_unit = 4 K Your query_cache_size seems to be too high. Perhaps you can use these resources elsewhere MySQL won't cache query results that are larger than query_cache_limit in size SORT OPERATIONS Current sort_buffer_size = 16 M Current read_rnd_buffer_size = 8 M Sort buffer seems to be fine JOINS Current join_buffer_size = 3.00 M You have had 2 queries where a join could not use an index properly You should enable "log-queries-not-using-indexes" Then look for non indexed joins in the slow query log. If you are unable to optimize your queries you may want to increase your join_buffer_size to accommodate larger joins in one pass. Note! This script will still suggest raising the join_buffer_size when ANY joins not using indexes are found. OPEN FILES LIMIT Current open_files_limit = 16344 files The open_files_limit should typically be set to at least 2x-3x that of table_cache if you have heavy MyISAM usage. Your open_files_limit value seems to be fine TABLE CACHE Current table_cache value = 768 tables You have a total of 761 tables You have 768 open tables. Current table_cache hit rate is 49% , while 100% of your table cache is in use You should probably increase your table_cache TEMP TABLES Current max_heap_table_size = 256 M Current tmp_table_size = 512 M Of 5403 temp tables, 10% were created on disk Effective in-memory tmp_table_size is limited to max_heap_table_size. Created disk tmp tables ratio seems fine TABLE SCANS Current read_buffer_size = 8 M Current table scan ratio = 24 : 1 read_buffer_size seems to be fine TABLE LOCKING Current Lock Wait ratio = 1 : 1204 You may benefit from selective use of InnoDB. If you have long running SELECT's against MyISAM tables and perform frequent updates consider setting 'low_priority_updates=1'