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1)查看MySQL全局占用多少内存
- SELECT (@@innodb_buffer_pool_size
- +@@innodb_log_buffer_size
- +@@key_buffer_size) / 1024 /1024 AS MEMORY_MB;
查询结果为：
- +----------------+
- | MEMORY_MB |
- +----------------+
- | 20512.00000000 |
- +----------------+
2）查看performance_schema占用多少内存
- SELECT SUBSTRING_INDEX(event_name,'/',2) AS
- code_area, sys.format_bytes(SUM(current_alloc))
- AS current_alloc
- FROM sys.x$memory_global_by_current_bytes
- GROUP BY SUBSTRING_INDEX(event_name,'/',2)
- ORDER BY SUM(current_alloc) DESC;
查询结果为：
- +---------------------------+---------------+
- | code_area | current_alloc |
- +---------------------------+---------------+
- | memory/performance_schema | 349.80 MiB |
- +---------------------------+---------------+
3）查看每个线程占用多少内存
- SELECT ( ( @@read_buffer_size
- + @@read_rnd_buffer_size
- + @@sort_buffer_size
- + @@join_buffer_size
- + @@binlog_cache_size
- + @@thread_stack
- + @@max_allowed_packet
- + @@net_buffer_length )
- ) / (1024*1024) AS MEMORY_MB;
查询结果为：
- +-----------+
- | MEMORY_MB |
- +-----------+
- | 87.5156 |
- +-----------+
查看当前线程
- show full processlist
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