优化Mysql参数的具体步骤-创新互联

不知道大家之前对类似优化Mysql参数的具体步骤的文章有无了解，今天我在这里给大家再简单的讲讲。感兴趣的话就一起来看看正文部分吧，相信看完优化Mysql参数的具体步骤你一定会有所收获的。

一、优化的配置文件

[client]
port=3306
socket=/tmp/mysql.sock

[mysqld]

# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
innodb_buffer_pool_size = 3G

# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# log_bin

# These are commonly set, remove the # and set as required.
user = mysql
basedir = /app/mysql
datadir = /app/mysql/data
port=3307
server-id = 1
socket=/tmp/mysql.sock

#允许创建函数
log_bin_trust_function_creators = 1

character-set-server = utf8
#log-error = /var/log/mysql/error.log
#pid-file = /var/log/mysql/mysql.pid
general_log = 1
skip-name-resolve
#skip-networking
back_log = 300

max_connections = 1000
max_connect_errors = 6000
open_files_limit = 65535
table_open_cache = 4096 
max_allowed_packet = 100M
binlog_cache_size = 10M
max_heap_table_size = 32M
tmp_table_size = 64M

read_buffer_size = 8M
read_rnd_buffer_size = 8M
sort_buffer_size = 8M
join_buffer_size = 128M
key_buffer_size = 8M

thread_cache_size = 64

query_cache_type = 1
query_cache_size = 128M
query_cache_limit = 2M

ft_min_word_len = 4

log_bin = mysql-bin
binlog_format = mixed
expire_logs_days = 30

performance_schema = 0
explicit_defaults_for_timestamp

lower_case_table_names = 1

myisam_sort_buffer_size = 8M
myisam_repair_threads = 1

interactive_timeout = 28800
wait_timeout = 28800

# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M

# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0

# Recommended in standard MySQL setup
sql_mode=NO_ENGINE_SUBSTITUTION,NO_AUTO_CREATE_USER,STRICT_TRANS_TABLES

[mysqldump]
quick
max_allowed_packet = 16M

二、参数解释查看

max_connections = 1000       #客户端连接数
max_connect_errors = 6000     #错误连接数
-----
mysql> show variables like '%conn%';
+-----------------------------------------------+-----------------+
| Variable_name                 | Value      |
+-----------------------------------------------+-----------------+
| character_set_connection            | utf8       |
| collation_connection              | utf8_general_ci |
| connect_timeout                | 10        |
| disconnect_on_expired_password         | ON        |
| init_connect                  |         |
| max_connect_errors               | 6000       |
| max_connections                | 1000       |
| max_user_connections              | 0        |
| performance_schema_session_connect_attrs_size | 0        |
+-----------------------------------------------+-----------------+
9 rows in set (0.01 sec)
-----
查看系统当前连接数
mysql> show status like 'Threads%';
+-------------------+-------+
| Variable_name   | Value |
+-------------------+-------+
| Threads_cached   | 9   |
| Threads_connected | 3   |   #连接数
| Threads_created  | 12   |
| Threads_running  | 2   |
+-------------------+-------+
4 rows in set (0.01 sec)
----------------------------------------------------------------------------------------------------
table_open_cache=4096   
#通常此值需要大于Opened_tables值
查看当前Opened_tables值
mysql> show status like '%Opened%';
+--------------------------+-------+
| Variable_name       | Value |
+--------------------------+-------+
| Opened_files       | 2979  |
| Opened_table_definitions | 1   |
| Opened_tables       | 1   |     #对比
+--------------------------+-------+
3 rows in set (0.00 sec)
----------------------------------------------------------------------------------------------------
max_heap_table_size = 32M
tmp_table_size = 64M
#参考文档：https://www.jb51.net/article/85341.htm
mysql> show status like '%created_tmp%';    #查看当前情况
+-------------------------+-------+
| Variable_name      | Value |
+-------------------------+-------+
| Created_tmp_disk_tables | 2921  |
| Created_tmp_files    | 11   |
| Created_tmp_tables    | 8476  |
+-------------------------+-------+
3 rows in set (0.00 sec)
----------------------------------------------------------------------------------------------------
read_buffer_size = 8M
read_rnd_buffer_size = 8M
sort_buffer_size = 8M
join_buffer_size = 128M
key_buffer_size = 8M
参考文档：https://www.jb51.net/article/84170.htm

----------------------------------------------------------------------------------------------------
innodb_buffer_pool_size = 3G         #大建议值为内存的75%

---------------------------------------------------------------------------------------------------
thread_cache_size = 64
系统参数：
mysql> show global status like 'Threads_%';
+-------------------+-------+
| Variable_name   | Value |
+-------------------+-------+
| Threads_cached   | 9   |     #这就是thread_cache_size
| Threads_connected | 3   |
| Threads_created  | 12   |
| Threads_running  | 2   |
+-------------------+-------+
4 rows in set (0.00 sec)
参考文档：https://www.jianshu.com/p/47adb747652d

---------------------------------------------------------------------------------------------------
query_cache_type = 1
query_cache_size = 128M
query_cache_limit = 2M

mysql> SHOW VARIABLES LIKE 'have_query_cache'; 
+------------------+-------+
| Variable_name   | Value |
+------------------+-------+
| have_query_cache | YES  |
+------------------+-------+
1 row in set (0.00 sec)

mysql> SHOW STATUS LIKE 'Qcache%'; 
+-------------------------+-----------+
| Variable_name      | Value   |
+-------------------------+-----------+
| Qcache_free_blocks    | 1     |
| Qcache_free_memory    | 134200384 |
| Qcache_hits       | 0     |
| Qcache_inserts      | 0     |
| Qcache_lowmem_prunes   | 0     |
| Qcache_not_cached    | 6     |
| Qcache_queries_in_cache | 0     |
| Qcache_total_blocks   | 1     |
+-------------------------+-----------+
8 rows in set (0.00 sec)

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