mysql内存计算公式

Mysql内存计算公式，有一定的参考意义，存起来

mysql内存计算公式

mysql used mem =key_buffer_size + query_cache_size + tmp_table_size

+ innodb_buffer_pool_size + innodb_additional_mem_pool_size

+ innodb_log_buffer_size

+ max_connections * (

read_buffer_size + read_rnd_buffer_size

+ sort_buffer_size+ join_buffer_size

+ binlog_cache_size + thread_stack

)

在mysql 中输入如下命令，可显示各占内存参数大小SHOW VARIABLES LIKE 'key_buffer_size';

SHOW VARIABLES LIKE 'query_cache_size';

SHOW VARIABLES LIKE 'tmp_table_size';

SHOW VARIABLES LIKE 'innodb_buffer_pool_size';

SHOW VARIABLES LIKE 'innodb_additional_mem_pool_size';

SHOW VARIABLES LIKE 'innodb_log_buffer_size';

SHOW VARIABLES LIKE 'read_buffer_size';

SHOW VARIABLES LIKE 'read_rnd_buffer_size';

SHOW VARIABLES LIKE 'sort_buffer_size';

SHOW VARIABLES LIKE 'join_buffer_size';

SHOW VARIABLES LIKE 'binlog_cache_size';

SHOW VARIABLES LIKE 'thread_stack';

在mysql 中输入如下命令，可自动计算自己的当前配置最大的内存消耗

SHOW VARIABLES LIKE'innodb_buffer_pool_size';

SHOW VARIABLES LIKE 'innodb_additional_mem_pool_size';

SHOW VARIABLES LIKE 'innodb_log_buffer_size';

SHOW VARIABLES LIKE 'thread_stack';

SET @kilo_bytes = 1024;

SET @mega_bytes = @kilo_bytes * 1024;

SET @giga_bytes = @mega_bytes * 1024;

SET @innodb_buffer_pool_size = 2 * @giga_bytes;

SET @innodb_additional_mem_pool_size = 16 * @mega_bytes;

SET @innodb_log_buffer_size = 8 * @mega_bytes;

SET @thread_stack = 192 * @kilo_bytes;

SELECT

( @@key_buffer_size + @@query_cache_size + @@tmp_table_size

+ @innodb_buffer_pool_size + @innodb_additional_mem_pool_size

+ @innodb_log_buffer_size

+ @@max_connections * (

@@read_buffer_size + @@read_rnd_buffer_size + @@sort_buffer_size + @@join_buffer_size + @@binlog_cache_size + @thread_stack

) ) / @giga_bytes AS MAX_MEMORY_GB;