Comparator for multiple column sorting
Hi,
Wr have written a below query
select p.name, o.id, ol.name, pr.name from Person p , Order o , OrderLine ol, Product pr where...
order by p.key asc, o.key asc, ol.key desc, pr.key desc
This query is taking lot of time as it seems the ORDER BY is taking more time. Hence we thought of moving sorting in the java side.
Here whether I need to create 4 comparators
1) PersonComparator with p.key asc
2) OrderComparator with o.key asc
3) OrderLineComparator with ol.key desc
4) ProductComparator with pr.key desc
This query returns a list , hence we need to do some thing like this
Collections.sort(list, new PersonComparator())
Collections.sort(list, new OrderComparator())
Collections.sort(list, new OrderLineComparator())
Collections.sort(list, new ProductComparator())
Is there any other better way of handling this sorting as 2 fields needs asc and other 2 fields needs desc. Whether we need to create 4 comparators for each object?
Please clarify. If there is any alternative please specify that as well.
Thanks.
>
This query is taking lot of time as it seems the ORDER BY is taking more time
>
Not sure how you drew that conclusion. There is nothing in your post to support it. Oracle is very efficient at sorting.
More likely the joins and filters (which you didn't show) in your query are either not using existing indexes or the proper indexes don't exist.
Post the question in the SQL and PL/SQL forum and provide the following information
1, Read the FAQ at the top of the main forum page for how to post tuning requests - it will include the below info
2. The 4 digit Oracle version (post results of SELECT * FROM V$VERSION)
3. The full query
4. The DDL for the Person, Order and OrderLine tables
5. The DDL for the existing indexes on the table
6. The approximate number of records in each table
7. The expected number of records you expect in the result set
8. The execution plan for the query
A. Open a sql*plus session
B. set serveroutput on
C. set autotrace traceonly
D. SELECT P.NAME ... -- that is, execute the query
E. Copy and Paste the entire output of the result, including the execution plan
You (or your DBA) need to determine how much work is being done and where the time is being taken before deciding what solutions to consider. The phrase 'taking more time' doesn't mean anything unless you have something to compare it to. Ten seconds to return one record could be slow while ten minutes to return 1 million records could be fast.
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