SQL Performance tuning

Question

Hello everybody,
I have a problem with an search application, users can search in different tables, those tables have an average off 15 million records. The users can add "search lines"
Here is an example off a search line typename = 'Project' attributename = 'name' value LIKE '%demo%'
When a user adds 3 or more search lines the application becomes slow.
Its running on a 10.2.0.10 and the hardware is not that important here, because it will change all the time because to search application will be installed on the intranet off different companies.
The problem will rise when alot off joins happen, I tried materialized views, its faster but the queries will be different all the time. So when alot off users will query and alot off materialized views are made it will maybe slow down the server.
Here is the example sql code that the application dynamically creates, does anyone have a suggestion to optimize this?
All the tables used in this query have indexes on all there columns, maybe to much indexes slows down the query?
SELECT q2.tbl_id
FROM
(SELECT tbl_search_attstring.tbl_id,
tbl_search_atttype.typename
FROM tbl_search_attstring,
tbl_search_atttype
WHERE tbl_search_attstring.typeid = tbl_search_atttype.typeid
AND typename = 'Project'
AND attributename = 'name'
AND LOWER(VALUE) LIKE '%demo%')
q1,
(SELECT tbl_search_attstring.tbl_id,
tbl_search_atttype.typename
FROM tbl_search_attstring,
tbl_search_atttype
WHERE tbl_search_attstring.typeid = tbl_search_atttype.typeid
AND typename = 'Section'
AND attributename = 'name'
AND LOWER(VALUE) LIKE '%section%')
q2,
(SELECT tbl_search_attstring.tbl_id
FROM tbl_search_attstring,
tbl_search_atttype
WHERE tbl_search_attstring.typeid = tbl_search_atttype.typeid
AND typename = 'Dir'
AND attributename = 'default label'
AND LOWER(VALUE) LIKE '%a%')
q3,
tbl_relationship rel
WHERE q1.tbl_id = rel.parent
AND q3.tbl_id = rel.parent
AND rel.child = q2.tbl_id
Thanks in advance!

Answer 1

Hi,
My suggestion is you should create your query dynamically by pl/sql.
On the other hand pls try this;
SELECT q2.tbl_id
FROM
(SELECT tbl_search_attstring.tbl_id,
tbl_search_atttype.typename
FROM tbl_search_attstring,
tbl_search_atttype
WHERE tbl_search_attstring.typeid = tbl_search_atttype.typeid
AND typename in ('Project','Dir')
AND attributename in( 'name','default label')
AND LOWER(VALUE) LIKE '%demo%' or LOWER(VALUE) LIKE '%a%')
q13,
(SELECT tbl_search_attstring.tbl_id,
tbl_search_atttype.typename
FROM tbl_search_attstring,
tbl_search_atttype
WHERE tbl_search_attstring.typeid = tbl_search_atttype.typeid
AND typename = 'Section'
AND attributename = 'name'
AND LOWER(VALUE) LIKE '%section%')
q2,
tbl_relationship rel
WHERE q13.tbl_id = rel.parent
AND rel.child = q2.tbl_id
BR...
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