优化MySQL占用内存过高总结

虾米哥 阅读:145 2022-04-20 15:48:56 评论:0
本文章主要介绍了优化MySQL占用内存过高,具有不错的的参考价值,希望对您有所帮助,如解说有误或未考虑完全的地方,请您留言指出,谢谢!

打开mysql 的配置文件  my.cnf 查找方式:IT虾米网

在[mysqld]后面修改或添加

# The maximum amount of concurrent sessions the MySQL server will 
# allow. One of these connections will be reserved for a user with 
# SUPER privileges to allow the administrator to login even if the 
# connection limit has been reached. 
max_connections=888 
 
# Query cache is used to cache SELECT results and later return them 
# without actual executing the same query once again. Having the query 
# cache enabled may result in significant speed improvements, if your 
# have a lot of identical queries and rarely changing tables. See the 
# "Qcache_lowmem_prunes" status variable to check if the current value 
# is high enough for your load. 
# Note: In case your tables change very often or if your queries are 
# textually different every time, the query cache may result in a 
# slowdown instead of a performance improvement. 
query_cache_size=128M 
 
# The number of open tables for all threads. Increasing this value 
# increases the number of file descriptors that mysqld requires. 
# Therefore you have to make sure to set the amount of open files 
# allowed to at least 4096 in the variable "open-files-limit" in 
# section [mysqld_safe] 
table_open_cache=512 
 
# Maximum size for internal (in-memory) temporary tables. If a table 
# grows larger than this value, it is automatically converted to disk 
# based table This limitation is for a single table. There can be many 
# of them. 
tmp_table_size=64M 
 
 
# How many threads we should keep in a cache for reuse. When a client 
# disconnects, the client's threads are put in the cache if there aren't 
# more than thread_cache_size threads from before.  This greatly reduces 
# the amount of thread creations needed if you have a lot of new 
# connections. (Normally this doesn't give a notable performance 
# improvement if you have a good thread implementation.) 
thread_cache_size=8 
 
#*** MyISAM Specific options 
 
# The maximum size of the temporary file MySQL is allowed to use while 
# recreating the index (during REPAIR, ALTER TABLE or LOAD DATA INFILE. 
# If the file-size would be bigger than this, the index will be created 
# through the key cache (which is slower). 
myisam_max_sort_file_size=100G 
 
# If the temporary file used for fast index creation would be bigger 
# than using the key cache by the amount specified here, then prefer the 
# key cache method.  This is mainly used to force long character keys in 
# large tables to use the slower key cache method to create the index. 
myisam_sort_buffer_size=35M 
 
# Size of the Key Buffer, used to cache index blocks for MyISAM tables. 
# Do not set it larger than 30% of your available memory, as some memory 
# is also required by the OS to cache rows. Even if you're not using 
# MyISAM tables, you should still set it to 8-64M as it will also be 
# used for internal temporary disk tables. 
key_buffer_size=25M 
 
# Size of the buffer used for doing full table scans of MyISAM tables. 
# Allocated per thread, if a full scan is needed. 
read_buffer_size=64K 
read_rnd_buffer_size=256K 
 
# This buffer is allocated when MySQL needs to rebuild the index in 
# REPAIR, OPTIMZE, ALTER table statements as well as in LOAD DATA INFILE 
# into an empty table. It is allocated per thread so be careful with 
# large settings. 
sort_buffer_size=256K

然后重启MySQL服务

linux重启

service mysqld restart

标签:数据库
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