# Read Bottleneck Analysis

![left](./student-guide/diagram/08-Troubleshooting-reading-bottleneck-01-01.png)
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Read bottleneck analysis
- Check the CPU utilization of the unified read pool
  - If the unified pool is not turned on, you need to check the coprocessor CPU and storage read pool separately
- Check coprocessor handle and wait delays, the reason for the high latency
  - Scan a wide area
  - Unbalanced request
  - Thread pool configuration is too small
  - Abnormal execution plan
- Check block cache hit rate