Optimizing the query containing 7 table joins

Question

hi,, I have a query which is taking almost 20 minutes to retrieve the data from DB. let me know how can i further optimize the query.. the tables contains huge amount of data
Table1 a -> 1040131 rows
Table2 b -> 1040131 rows
Table3 c -> 2080262 rows
Table4 d -> 2749 rows
Table5 e -> 1040131 rows,
Table6 f -> 93819 rows
Table7 g -> 99203 rows
My query is
SELECT a.lid, g.image, f.product , d.manufacturer, b.desc, c.price, c.abbr, c.currency, c.class
FROM
Table1 a,
Table2 b,
Table3 c,
Table4 d,
Table5 e,
Table6 f,
Table7 g
WHERE (UPPER(b.desc) like '%TEST%' OR UPPER(b.desc) like '%BEST%')
and a.line = b.line
AND a.line = c.line
AND c.subset = 576
AND a.manufacturer = d.manufacturer
AND a.line = e.line
and a.product = f.product
and e.image = g.image
Please tell me how can i optimize this query further to work faster

Answer 1

user1708333 wrote:
WHERE (UPPER(b.desc) like '%TEST%' OR UPPER(b.desc) like '%BEST%')
I would imagine that that line is the main culprit.
You are doing a free text search which will always result in a full table scan the way you are doing it.
If you need free text searching then you should consider using [Oracle Text|http://www.oracle.com/technology/products/text/index.html]