Question

我面临高CPU利用率问题，并发create temporary table语句太多导致CPU利用率过高？

是否有任何查询可以捕获导致高CPU利用率的查询？

我们设置的变量： -

tmp_table_size = 1G

max_heap_table_size = 1G

innodb_buffer_pool_size = 145 G

innodb_buffer_pool_instance = 8

innodb_page_cleaner = 8

状态变量： -

        mysql> show global status like '%tmp%';
    +-------------------------+-----------+
    | Variable_name           | Value     |
    +-------------------------+-----------+
    | Created_tmp_disk_tables | 60844516  |
    | Created_tmp_files       | 135751    |
    | Created_tmp_tables      | 107643364 |
    +-------------------------+-----------+
mysql> show global status like '%innodb_buffer%';
+---------------------------------------+--------------------------------------------------+
| Variable_name                         | Value                                            |
+---------------------------------------+--------------------------------------------------+
| Innodb_buffer_pool_dump_status        | Dumping of buffer pool not started               |
| Innodb_buffer_pool_load_status        | Buffer pool(s) load completed at 170917 19:11:45 |
| Innodb_buffer_pool_resize_status      |                                                  |
| Innodb_buffer_pool_pages_data         | 8935464                                          |
| Innodb_buffer_pool_bytes_data         | 146398642176                                     |
| Innodb_buffer_pool_pages_dirty        | 18824                                            |
| Innodb_buffer_pool_bytes_dirty        | 308412416                                        |
| Innodb_buffer_pool_pages_flushed      | 122454921                                        |
| Innodb_buffer_pool_pages_free         | 188279                                           |
| Innodb_buffer_pool_pages_misc         | 377817                                           |
| Innodb_buffer_pool_pages_total        | 9501560                                          |
| Innodb_buffer_pool_read_ahead_rnd     | 0                                                |
| Innodb_buffer_pool_read_ahead         | 585245                                           |
| Innodb_buffer_pool_read_ahead_evicted | 14383                                            |
| Innodb_buffer_pool_read_requests      | 304878851665                                     |
| Innodb_buffer_pool_reads              | 10537188                                         |
| Innodb_buffer_pool_wait_free          | 0                                                |
| Innodb_buffer_pool_write_requests     | 14749510186                                      |
+---------------------------------------+--------------------------------------------------+

Answer 1

第1步 - 显示进程列表如果是，则查找任何进程是锁定表，而不是将其更改为myisam。
第2步 - 检查Ram和你的数据库大小
第3步 - 解释复杂的查询并检查文件排序或行的最大数量是否扫描通过使表格平坦，不超过4个子查询来删除它
第4步 - 有效使用联接

RDS CPU利用率高

1 个答案: