Oracle PL/SQL - Are NO_DATA_FOUND Exceptions bad for stored procedure performance?

Question

I\'m writing a stored procedure that needs to have a lot of conditioning in it. With the general knowledge from C#.NET coding that exceptions can hurt performance, I\'ve always

Answer 1

The first (excellent) answer stated -

The method with count() is unsafe. If another session deletes the row that met the condition after the line with the count(*), and before the line with the select ... into, the code will throw an exception that will not get handled.

Not so. Within a given logical Unit of Work Oracle is totally consistent. Even if someone commits the delete of the row between a count and a select Oracle will, for the active session, obtain the data from the logs. If it cannot, you will get a "snapshot too old" error.