Troubleshooting SQL congestion of time series chart

My time series chart has trouble with connecting to SQL. I have clicked multiple times into the flex (column) component. Please help me troubleshoot the problem. I think the problem happened because the chart meets trouble connecting to SQL (there were lots of reminiscent data connecting to the chart). Someone please understand and help me solve this problem.
In conclusion, I have deep selected all components in the screen, but nothing happened because the data has been congested due to connecting troubles via SQL