Why does MySQL hang after many inserts?

Question

PHP

There are 6 sites.
5 sites updates the product catalog from the main site.
Update: a MySQL dump of the product catalog is generated on the main site (18 tables, on average ~ 10th records per table), then the dump is inserted on the updated site. In the dump - a table drop and an insert of records.
Update one takes 12-15 seconds.
MySQL hangs after all updates. Not at the time of the updates, but after, it may take 5 minutes, maybe 10 ... Or it may not freeze.

Can someone tell me which way to dig?

Answer 1

Probably, in the direction of the architecture of the entire bunch of six sites. I'm sorry if my question seems stupid. However, would it make sense for the five slave sites to simply use the original site's database rather than clone it permanently to itself?