CREATE table takes forever for 5000 records.

Question

Hi All, I need your help in undertsanding this.
Why is that when I select this query below, query comes pretty fast within seconds --5000 rows returned.
But when I try to create a table out of the query,
SELECT r.*
FROM v1 r JOIN v2 u ON(r.id = u.name
AND r.prep = u.prep)
WHERE r.prep IS NOT NULL;
It takes more that 36 hours and still running!Whats happening??i tried this many times.
I checked teh tablespace and it has 3G space and when the CREATE table is running, i don'tr see teh tablespace change
CREATE TABLE AS
SELECT r.*
FROM v1 r JOIN v2 u ON(r.id = u.name
AND r.prep = u.prep)
WHERE r.prep IS NOT NULL;

Answer 1

it seems as if your source data is located on a different site (the REMOTE in the execution plan indicated that).
When you add the insert statement this could mean that now all the data is first moved to the local site and the join is executed here. It could be that the original query was executed completely remote. Not so sure about it thou.
You can test using the /*+ append */ hint for the insert and the /*+driving_site (?) */ hint for the select.