Putting an already running SQL to background
Hi Gurus,
This sounds like a stupid problem but I'm sure most DBAs have faced it. Is there a way to move a long running SQL (like a create table as select * from big_table) to background process? I was contemplating whether there is a similar UNIX-like ctrl-z...
thanks,
james
Simple answer, no.
Complex answer... well perhaps.
Your client session connects to Oracle. Oracle uses a server process to service your client session. You throw a CTAS (create table as select - yes, we also have acronyms for everything) its way.
The client process now waits. The SQL call it made is a blocking/synchronous call. The server process gets the CTAS, parses it into a cursor, and executes its.
What happens when you pull the client's plug? Nothing. The Oracle server process will only notice that its client session it is suppose to service is gone after the CTAS. As the CTAS is a DDL is has an implicit commit. So after the actual table has been created, the server process will notice you have pulled the client's plug and it will rollback (nothing to rollback), and terminate.
So the CTAS would have completed despite you pulling the client plug.
However.. this is pretty much an ugly hack of putting a server process in background mode so to speak. Also, it assumes that DCD (Dead Connected Detection) does not play a role. Also assumes that this behaviour of the server process is common across different Oracle patchsets and releases.
The correct method would be to use an EXECUTE IMMEDIATE command for the CTAS and to execute that using Oracle's DBMS_JOB or DBMS_SCHEDULER (10g and later).
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