today i was optimizing my mariadb since my website was running too slow My machine is a Centos 7 , 4 gbs ram 3 cpu
i runned a script called mysql_tuner.pl and the results were:
-- MYSQL PERFORMANCE TUNING PRIMER -- - By: Matthew Montgomery - MySQL Version 5.5.40-MariaDB x86_64 Uptime = 0 days 0 hrs 0 min 12 sec Avg. qps = 1 Total Questions = 16 Threads Connected = 1 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/5.5/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 = 10.000000 sec. You have 0 out of 37 that take longer than 10.000000 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/5.5/en/point-in-time-recovery.html WORKER THREADS Current thread_cache_size = 0 Current threads_cached = 0 Current threads_per_sec = 1 Historic threads_per_sec = 1 Your thread_cache_size is fine MAX CONNECTIONS Current max_connections = 151 Current threads_connected = 1 Historic max_used_connections = 1 The number of used connections is 0% 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 = 110 M Current InnoDB data space = 1.39 G Current InnoDB buffer pool free = 71 % Current innodb_buffer_pool_size = 128 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 : 274 M Configured Max Per-thread Buffers : 419 M Configured Max Global Buffers : 272 M Configured Max Memory Limit : 691 M Physical Memory : 4.00 G Max memory limit seem to be within acceptable norms KEY BUFFER No key reads?! Seriously look into using some indexes Current MyISAM index space = 58 M Current key_buffer_size = 128 M Key cache miss rate is 1 : 0 Key buffer free ratio = 81 % Your key_buffer_size seems to be fine QUERY CACHE Query cache is supported but not enabled Perhaps you should set the query_cache_size SORT OPERATIONS Current sort_buffer_size = 2 M Current read_rnd_buffer_size = 256 K No sort operations have been performed Sort buffer seems to be fine JOINS ./mysql_tuner.pl: line 402: export: `2097152': not a valid identifier Current join_buffer_size = 132.00 K You have had 0 queries where a join could not use an index properly Your joins seem to be using indexes properly OPEN FILES LIMIT Current open_files_limit = 1024 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_open_cache = 400 tables Current table_definition_cache = 400 tables You have a total of 801 tables You have 400 open tables. Current table_cache hit rate is 16% , while 100% of your table cache is in use You should probably increase your table_cache You should probably increase your table_definition_cache value. TEMP TABLES Current max_heap_table_size = 16 M Current tmp_table_size = 16 M Of 347 temp tables, 9% were created on disk Created disk tmp tables ratio seems fine TABLE SCANS Current read_buffer_size = 128 K Current table scan ratio = 28 : 1 read_buffer_size seems to be fine TABLE LOCKING Current Lock Wait ratio = 0 : 295 Your table locking seems to be fine
so, i realized that i should raise table_open_cache... even i confirmed throught mysql command line
+--------------------+ | @@table_open_cache | +--------------------+ | 400 | +--------------------+ 1 row in set (0.00 sec) MariaDB [(none)]>
ok , so i ran into my.cnf
and edited like this:
[mysqld] datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock #table_cache = 1000 #max_open_files = 4000 #max_connections = 800 key_buffer_size = 60M max_allowed_packet = 1G table_open_cache = 2000 table_definition_cache = 2000 #sort_buffer_size = 2M #read_buffer_size = 1M #read_rnd_buffer_size = 8M #myisam_sort_buffer_size = 64M #thread_cache_size = 15 #query_cache_size = 32M #thread_concurrency = 8 innodb_buffer_pool_size = 2G # Disabling symbolic-links is recommended to prevent assorted security risks symbolic-links=0 # Recommended in standard MySQL setup sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES [mysqld_safe] log-error=/var/log/mysqld.log pid-file=/var/run/mysqld/mysqld.pid [client] default-character-set=utf8 [mysql] default-character-set=utf8
but table_open_cache is still 400! my server is reading all the other variables, except table_open_cache
results after changing the cnf file
TABLE CACHE Current table_open_cache = 400 tables Current table_definition_cache = 400 tables You have a total of 801 tables You have 400 open tables. Current table_cache hit rate is 16% , while 100% of your table cache is in use You should probably increase your table_cache You should probably increase your table_definition_cache value.
tried everything, any help?