Performance issue in linux while using set with URL object

Hi,
I am facing performance issue while using Set(HashSet) with URL object on linux. But it is running perfectly on windows.
I am using
set.contains(urlObject)
Above particular statement is taking 40 sec on Linux, and only a fraction of ms on windows.
I have checked the jre version on both OS. It is the same version (jre6)
on both the OS.
Could anyone please tell me what is the exact reason, why the same statement is taking more time on linux than windows.
Thanks & Regards
Naveen

jtahlborn wrote:
I believe the URL hashCode/equals implementations have some /tricky behavior which involves network access in order to run (doing hostname lookups and the like). you may want to either use simple Strings, or possibly the URI class (i think it fixed some of this behavior, although i could be wrong).The second new thing I have learned today. I was wrong in reply # 1 because looking at the URL code for 1.6 I see that the hash code is generated from the IP address and this has a lazy evaluation. Each URL placed in a HashMap (or other hash based collection) requires a DNS lookup the first time the hash code is used.
P.S. 40 seconds does seem a long time for a DNS lookup!
Edited by: sabre150 on Feb 13, 2008 3:40 PM

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Performance issue in SQL while using max

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-- Hope this helps.
Doug Robbins - Word MVP,
dkr[atsymbol]mvps[dot]org
Posted via the Community Bridge
"galmcrantz" wrote in message news:[email protected]...
Is this a bug or is there a config setting that can prevent Word from needlessly opening Excel repeatedly (upon initial open of a DOCX Word doc) when pre-existing links should NOT be updated. The behavior is good using 2003 formats (DOC & XLS), but varies
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Hi All,
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Edited by: user539954 on May 14, 2009 12:22 PM
Edited by: user539954 on May 14, 2009 12:32 PM

user539954 wrote:
Please see the replies below:
- How many distinct values for C1 out of that 10 million rows? I'm guessing that histograms were created for C1, correct?
=>7 million distinct c1 values. I have not gathered a histogram yet. Should I try that?
SQL> explain plan for select * from T1 where C1 = '0000000954';
| Id | Operation         | Name           | Rows | Bytes | Cost (%CPU)|
|   0 | SELECT STATEMENT |                |   244K|    19M| 26228   (5)|
|   1 | TABLE ACCESS FULL| T1 |   244K|    19M| 26228   (5)|
SQL> explain plan for select * from T1 where C1 = '0033454555';
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|   0 | SELECT STATEMENT            |                    |   532 | 43624 |   261   (0)|
|   1 | TABLE ACCESS BY INDEX ROWID| T1     |   532 | 43624 |   261   (0)|
|   2 |   INDEX RANGE SCAN          | I1 |   532 |       |     2   (0)|
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In the absence of a histogram and with 7M distinct keys in 10M rows, Oracle should have predicted 2 rows for both queries, not 244,000 and 532.
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Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk
"Science is more than a body of knowledge; it is a way of thinking"
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