☰

Mysql占用内存过多，如何解决

tag-icon • tag-icon mysql memory
Mysql占用内存过多，如何解决

我在测试箱上有一个 Drupal 网站，我是唯一的访问者。

当我什么都不做时，Mysql 占用了大约 7% 的内存。当我单击主页时，我可以通过 top 命令看到内存占用率上升到 15%。

然后它就剩下 15% 了，然后就一直卡在那里。所以之前我有大约 200M 的可用内存，现在只剩下 10M 的可用内存了。

一切都很慢，这不是开玩笑。内存不够。

内存总共是 1.5GB。它可能不大，但它是一台具有良好 CPU 的优质戴尔服务器。

有没有什么 mysql 变量可以研究？或者有什么工具可以帮助我让 mysql 更加真实。

附件是 my.cnf

[client]
default-character-set=utf8
port    = 3306
socket  = /tmp/mysql.sock

[mysqld]
character-set-server = utf8
replicate-ignore-db = mysql
replicate-ignore-db = test
replicate-ignore-db = information_schema
user    = mysql
port    = 3306
socket  = /data0/mysql/mysql.sock
basedir = /usr/local/webserver/mysql
datadir = /data0/mysql/data
log-error = /data0/mysql/mysql_error.log
pid-file = /data0/mysql/mysql.pid
open_files_limit    = 10240
back_log = 600
max_connections = 5000
max_connect_errors = 6000
table_cache = 614
external-locking = FALSE
max_allowed_packet = 32M
sort_buffer_size = 1M
join_buffer_size = 1M
thread_cache_size = 300
#thread_concurrency = 8
query_cache_size = 512M
query_cache_limit = 2M
query_cache_min_res_unit = 2k
default-storage-engine = MyISAM
thread_stack = 192K
transaction_isolation = READ-COMMITTED
tmp_table_size = 512M
max_heap_table_size = 246M
long_query_time = 3
log-slave-updates
log-bin = /data0/mysql/binlog/binlog
binlog_cache_size = 4M
binlog_format = MIXED
max_binlog_cache_size = 64M
max_binlog_size = 1G
relay-log-index = /data0/mysql/relaylog/relaylog
relay-log-info-file = /data0/mysql/relaylog/relaylog
relay-log = /data0/mysql/relaylog/relaylog
expire_logs_days = 30
key_buffer_size = 256M
read_buffer_size = 1M
read_rnd_buffer_size = 16M
bulk_insert_buffer_size = 64M
myisam_sort_buffer_size = 128M
myisam_max_sort_file_size = 10G
myisam_repair_threads = 1
myisam_recover

interactive_timeout = 120
wait_timeout = 120

skip-name-resolve
slave-skip-errors = 1032,1062,126,1114,1146,1048,1396

server-id = 1

innodb_additional_mem_pool_size = 16M
innodb_buffer_pool_size = 256M
innodb_data_file_path = ibdata1:256M:autoextend
innodb_file_io_threads = 4
innodb_thread_concurrency = 8
innodb_flush_log_at_trx_commit = 2
innodb_log_buffer_size = 16M
innodb_log_file_size = 128M
innodb_log_files_in_group = 3
innodb_max_dirty_pages_pct = 90
innodb_lock_wait_timeout = 120
innodb_file_per_table = 0

log-slow-queries = /data0/mysql/slow.log
long_query_time = 10
log-queries-not-using-indexes

[mysqldump]
quick
max_allowed_packet = 32M

答案1

如果您只想为数据库服务器使用少量内存，则 MySQL 配置无法适应这种情况。在您的 MySQL 发行版中，应该有一组my.cnf针对不同级别的内存使用情况进行优化的预写文件。我建议从版本开始my-small.cnf，看看它如何满足您的性能/内存使用要求。

相关内容