[question]master-slave sync delay

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Hi, all:

There is a problem about master-slave sync delay,
I find some infomations from 'show processlist', some like that:

1051 system user ns Connect 10 update xxx

what does Connect mean, mysql manual explained:

Connect

A replication slave is connected to its master.
Then, There is 10s delay from master to slave.
I want to know why does this happend, slow network I/O? or something wrong
with this update SQL?

Thanks
Regards

W.J

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