How to read the mobile cache in PHP

Single-user Android mobile terminal 5S submits data once and PC terminal 5S updates data once
Considering that in the later multi-user situation, there will be more data and the pressure on the database will be greater
One solution I thought of is to create a cache when the Android mobile terminal submits data
So how does the PC side read and identify which user submitted the cache and read it into the web page

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Single-user Android mobile terminal 5S submits data once and PC terminal 5S updates data once
Considering that in the later multi-user situation, there will be more data and the pressure on the database will be greater
One solution I thought of is to create a cache when the Android mobile terminal submits data
So how does the PC side read and identify which user submitted the cache and read it into the web page

The mobile terminal can consider websocket instead of polling