# The value of Seconds\_Behind\_Master is increasing

**URL:** <https://forums.percona.com/t/the-value-of-seconds-behind-master-is-increasing/5799>\
**Category:** Other MySQL® Questions\
**Created:** [August 8, 2017, 10:01pm UTC](https://forums.percona.com/t/the-value-of-seconds-behind-master-is-increasing/5799 "2017-08-08T22:01:17Z")\
**Posts on this page:** 1\
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**Author:** ![keith](https://avatars.discourse-cdn.com/v4/letter/k/f05b48/32.png) [@keith](https://forums.percona.com/u/keith)\
**Post date:** [August 20, 2017, 8:36pm UTC](https://forums.percona.com/t/the-value-of-seconds-behind-master-is-increasing/5799/3 "2017-08-20T20:36:13Z")

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> [@nvngpt31&#64;gmail.com;49384](#):
>
> Can you confirm like Exec\_Master\_Log\_Pos: is changing?

Thank you for helping me .  
Yes , It is changing. I found the reason for the problem. Scheduled tasks on the master server is working without index. And the disk of master server is SSD , the slave is HHD. Each modification of a record requires a full table scan.I stopped the scheduled task and returned to normal.

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