I have a query that I am attempting to run, but inner query is being rolled up into the overall query - per the optimizer (and jobexam observation).  While I know that if the inner query runs first, I will eliminate a number of records (making the result set smaller, and return quicker).

Just an example of what I am attempting to do:

I need to guarantee that a parent AND child rows has been inserted successfully before any other process is able to read ANY of the data.

What is the proper way to prevent DIRTY reads?  Per the InterSystems's documentation I should be able to use 'START TRANSACTION ISOLATION LEVEL READ COMMITTED'.  I have attempted to use these commands in embedded and dynamic SQL calls to no avail.

I have to be able to insert the data via JDBC calls, but legacy Caché (.MAC) may be reading the data, and if the data is read to quickly, I could have processing errors, as all the child rows have not been inserted.

Looking for a way in which I could possibly pass a flag through a property when performing an Insert statement, on a mapped class.

insert into my.class (serialNumber, modelNumber, myFlag) value ('testSerial', 'testModel', 0)
    myFlag is not stored in the DB.

The mapped class then calls a legacy routine (MAC) via CodeMode = 'objectgenerator', (Insert method within the 'objectgenerator')

Within the legacy routine, I am setting an index... but I don't always want to set it (multiple inserts, and I will only set the index on the LAST insert)