Read-committed means that if a data is flushed to the database, but the connection (i.e. the transaction executing on this connection) hasn't been committed yet, no other connection for a different transaction will not see the changes.
This is exactly what you observe. 'parallel transaction' means any other application or the same application running in another (i.e. a "parallel") transaction (or even without an active transaction) at the same time as your current transaction that is in the process of making the changes.
Does it make sense?
thanks,
-marina
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