High cpu usage on server by mysql process (3 replies)

Hello all,

On a dedicated server for Mysql, I am facing issue with CPU usage of Mysql process. When we are running jobs that retrieves data from Mysql server, CPU usage jumps from 0.3 upto maximum value of 170%.

When the job gets finished , CPU usage comes back to normal again.

Below are server specifications :

RAM - 8GB
Intel(R) Xeon(R) CPU E5-2680 0 @ 2.70GHz

We are running select queries as part of job run.

SHOW VARIABLES LIKE '%buffer%';
+-------------------------------------+----------------+
| Variable_name | Value |
+-------------------------------------+----------------+
| bulk_insert_buffer_size | 8388608 |
| innodb_buffer_pool_dump_at_shutdown | OFF |
| innodb_buffer_pool_dump_now | OFF |
| innodb_buffer_pool_filename | ib_buffer_pool |
| innodb_buffer_pool_instances | 8 |
| innodb_buffer_pool_load_abort | OFF |
| innodb_buffer_pool_load_at_startup | OFF |
| innodb_buffer_pool_load_now | OFF |
| innodb_buffer_pool_size | 4294967296 |
| innodb_change_buffer_max_size | 25 |
| innodb_change_buffering | all |
| innodb_log_buffer_size | 67108864 |
| innodb_sort_buffer_size | 1048576 |
| join_buffer_size | 8388608 |
| key_buffer_size | 33554432 |
| myisam_sort_buffer_size | 8388608 |
| net_buffer_length | 16384 |
| preload_buffer_size | 32768 |
| read_buffer_size | 2097152 |
| read_rnd_buffer_size | 16777216 |
| sort_buffer_size | 8388608 |
| sql_buffer_result | OFF |
+-------------------------------------+----------------+

Please help me to bring down this utilization.