两种方法：

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一、通过show status

MySQL> show status like 'innodb_buffer_pool_pages_data';
+-------------------------------+---------+
| Variable_name                 | Value   |
+-------------------------------+---------+
| Innodb_buffer_pool_pages_data | 3226366 |
+-------------------------------+---------+
1 row in set (0.00 sec)
mysql> show status like 'innodb_buffer_pool_pages_total';
+--------------------------------+---------+
| Variable_name                  | Value   |
+--------------------------------+---------+
| Innodb_buffer_pool_pages_total | 3244032 |
+--------------------------------+---------+
1 row in set (0.00 sec)

val=innodb_buffer_pool_pages_data/innodb_buffer_pool_pages_total x 100%=3226366/3244032 x 100%=99.46%

二、通过SQL查看

mysql> select * from performance_schema.global_status where variable_name in ('innodb_buffer_pool_pages_data','innodb_buffer_pool_pages_total');
+--------------------------------+----------------+
| VARIABLE_NAME                  | VARIABLE_VALUE |
+--------------------------------+----------------+
| Innodb_buffer_pool_pages_data  | 3226437        |
| Innodb_buffer_pool_pages_total | 3244032        |
+--------------------------------+----------------+
2 rows in set (0.00 sec)

val=innodb_buffer_pool_pages_data/innodb_buffer_pool_pages_total x 100%=3226437/3244032 x 100%= 99.46%

文章标题：计算innodb_buffer_pool使用率
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