我的MySQL服务器消耗了大量的内存。

内存占用1.内存消耗降序（前4）

MySQL的内存消耗特别是 –

• 针对大型服务器和数据集的PostgreSQL调优build议
• ApacheTop喜欢Nginx的测量命中内容的工具？
• 由于txg_sync在Ubuntu 14.04上的ZFS 0.6.3性能下降
• 在ZFS上调整电子邮件备份数据集
• 我应该如何设置My.cnf中的初始MySQL值来提高性能？

为什么有这么多的mysqld进程？ 他们是进程/线程吗？ 他们消耗了大量的记忆。 我在哪里设置了这个号码？

此外，我的查询花了很多时间来执行，因此我的网站变得越来越慢。

我my.cnf的一个片段 –

 [mysqld] key_buffer = 16M max_allowed_packet = 16M thread_stack = 192K thread_cache_size = 8 myisam-recover = BACKUP query_cache_limit = 1M query_cache_size = 16M innodb_lock_wait_timeout = 120 innodb_buffer_pool_size = 500M [mysqldump] max_allowed_packet = 16M [mysql] #no-auto-rehash # faster start of mysql but no tab completition [isamchk] key_buffer = 16M wait_timeout = 60 

我已经运行tuning-primer.sh来检查我做错了什么。 tuning-primer.sh相关部分结果 –

 MySQL Version 5.1.63-0ubuntu0.10.04.1 i486 Uptime = 176 days 0 hrs 24 min 31 sec Avg. qps = 8 Total Questions = 128972512 Threads Connected = 6 SLOW QUERIES The slow query log is NOT enabled. Current long_query_time = 10.000000 sec. You have 55628 out of 128972533 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/5.1/en/point-in-time-recovery.html WORKER THREADS Current thread_cache_size = 8 Current threads_cached = 7 Current threads_per_sec = 0 Historic threads_per_sec = 0 Your thread_cache_size is fine MAX CONNECTIONS Current max_connections = 151 Current threads_connected = 5 Historic max_used_connections = 147 The number of used connections is 97% of the configured maximum. You should raise max_connections INNODB STATUS Current InnoDB index space = 109 M Current InnoDB data space = 10.32 G Current InnoDB buffer pool free = 0 % Current innodb_buffer_pool_size = 500 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 : 929 M Configured Max Per-thread Buffers : 405 M Configured Max Global Buffers : 534 M Configured Max Memory Limit : 939 M Physical Memory : 3.94 G Max memory limit seem to be within acceptable norms KEY BUFFER Current MyISAM index space = 1 M Current key_buffer_size = 16 M Key cache miss rate is 1 : 204 Key buffer free ratio = 88 % Your key_buffer_size seems to be fine QUERY CACHE Query cache is enabled Current query_cache_size = 16 M Current query_cache_used = 8 M Current query_cache_limit = 1 M Current Query cache Memory fill ratio = 50.29 % Current query_cache_min_res_unit = 4 K MySQL won't cache query results that are larger than query_cache_limit in size SORT OPERATIONS Current sort_buffer_size = 2 M Current read_rnd_buffer_size = 256 K Sort buffer seems to be fine JOINS Current join_buffer_size = 132.00 K You have had 10728 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 = 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 = 64 tables Current table_definition_cache = 256 tables You have a total of 130 tables You have 64 open tables. Current table_cache hit rate is 0% , while 100% of your table cache is in use You should probably increase your table_cache TEMP TABLES Current max_heap_table_size = 16 M Current tmp_table_size = 16 M Of 6404640 temp tables, 48% were created on disk Perhaps you should increase your tmp_table_size and/or max_heap_table_size to reduce the number of disk-based temporary tables Note! BLOB and TEXT columns are not allow in memory tables. If you are using these columns raising these values might not impact your ratio of on disk temp tables. TABLE SCANS Current read_buffer_size = 128 K Current table scan ratio = 206 : 1 read_buffer_size seems to be fine TABLE LOCKING Current Lock Wait ratio = 1 : 84225 Your table locking seems to be fine 

我的服务器规格 –

 Disk Size 80GB ( Used = 50GB ) RAM 4GB Swap 4GB Number of CPUs 8 OS type 32 bit OS Ubuntu 10.04 

 SET GLOBAL max_connections = 500;