avalon566 commented on issue #3617: Show scaling progress and detail
URL: 
https://github.com/apache/incubator-shardingsphere/issues/3617#issuecomment-561057174
 
 
   ## About how to calculate realtime data sync delay second
   1. Create a table with timestamp column in source database.
   1. Sharding scaling timing update the timestamp column with current 
timestamp.
   1. Read the timestamp value from log, use current timestamp subtract the 
value, result is the delay second.
   
   This solution support MySQL and PostgreSQL.

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