Improving SQL query for large records.

I need to extract the difference on the table t1 and t2(contains both almost 6M records). Im looking specifically on the two columns (c1,c2)for my comparison.I need also to look at reference table to extract also other fields for my report. thank you
Dynamic Table (same table and structure but different records.)
t1
t2
Reference Static Table (all the tables below have two columns. c1 and c2 used for reference only)
t3
t4
t5
--Extracting data in t1 but not exists in t2
WITH v1 AS(SELECT c2,c3,c4 FROM t1 at1
WHERE NOT EXISTS (SELECT 'x' FROM t2 at2 WHERE at1.c1 = at2.c2)),
v2 AS (SELECT c1, c2 FROM t3),
v3 AS (SELECT c1, c2, c3 FROM t4),
v4 AS (SELECT c1,c2 FROM t5)
SELECT v1.c1, v1.c2, v3.c2, v4.c2 FROM t,t2,t3,t4
WHERE v1.c1 = v2.c1
AND v2.c2 = v3.c1
AND v3.c2 = v4.c1
ORDER BY v1.c1
I'm trying to improve my scripts to generate the record as fast as possible coz it takes too long. Any suggestions guys.? Im trying to look also on explain plan but I'm new on this. thank you

Hi,
your sample code can not compile?
There is no column c1 in the v1?
Probably a typo anyway :)
A couple of remarks:
The way you've used v1, v2, v3 and v4 does not help performance.
It only helps increasing the confusion.
Rewrite the query without the WITH clause, post the execution plan for the query and report your Oracle version and we can help you further.
/ Ronnie

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