JDBC query hangs server

I have a very weird case when a particular JDBC query kills weblogic server. Attached
is a thread dump. What's weird is:
1. There is only one client on the system, and I sware the client sends only one
request. At the same time there are 12 threads trying to execute the same query.
2. The query is at the start of thread dump and it takes ~9sec to execute on our
DB from SQL+. It returns ~300 records. If I change parameters it will be executed
fine. Each time a client wants to execute a query before it is executed it is
dumped to log, and there is only one query per all threads in the dump.
3. Looking into DB log there is no sight of the query that is dumped into log
file. DB does not have a clue... Both DB and WLS are waiting for each other...
Environment:
6.1sp2 on solaris
Oracle 8.1.7
JDBC driver from Oracle 9i
[x.txt]

There were two problems: request got hanging in the database (original) with proxy
timing out and making situation worse (sending more requests). 9.2.0.1 did not
have the original problem (statement did not hang), but the price was too high
(data corruption) :( Also the problem was very touchy - we got only two environments
which were duplicating it. This last mail was more on the whining side - hope
that someone seen something similar and can say a-ha! So I guess I'm back in slow
and painful try to reproduce and then fix mode... Most likely it all will end
up with SQL tuning, not app level solution...
"Slava Imeshev" <[email protected]> wrote:
Mike,
AFAIR the poblem was not in the driver but in the load balancer
resubmitting requests. Could you please try to use 9.0.1 driver.
Regards,
Slava Imeshev
"mike" <[email protected]> wrote in message
news:[email protected]...
Unfortunately the story is not completely over.
We found that the new driver in some cases garbles the data. That happenson updates
when WLS is changing object and the first parameter in the updatestatement is
string. Sounds weird, so here more details:
- We found that some strings in the database are garbled.
- JDBC trace brought us to update statements. It looks like for eachupdate container
creates prepared statement and sets parameters on it.
- If the first parameter is a string then it will be garbled (happenswith
two
independant objects).
The problem is defenitely driver-specific. It does not show up withany
driver
but 9.2.0.1. All previous drivers work right, but 9.0.1 that we usedbefore had
the problem described in the thread, and 8.x work at least 10 timesslower
(no
kidding).
Test app which connects to the same oracle instance and executes thestatement
from JDBC log works fine (sure it does). Adding nls_charset to classpathdoes
not make any difference. Attempt to create statement from within WLSwas
not taken.
Solution was even more bizzare. Since it was happening only when thefirst
attribute
was string we shuffled attributes and the problem went away. But Ido not
believe
that is a solution - IMHO that just masks the problem.
Any and all brignt and not-so-much ideas are welcome.

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Jdbc query hangs

Hi,
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What am I doing wrong?
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Hi,
I'm very new to Oracle, so forgive me if this is a rather stupid question:
I've written a little test application (cut and paste form the jdbc developers guide) that just connects to the university database and performs the same query 500 times in a row. After a number of queries the application freezes for exactly 60 seconds before continuing the loop, without throwing any kind of exception. this usually happens about 3 times during the loop.
What am I doing wrong?
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Kind regards,
Jurgen

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is your issue solved,if not mail me
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Hi,
Before going further, would you please let me know whether install all
necessary Windows Updates on those servers?
à
but after a period of time (8 hours, 30 hours, other random times) on some of the servers the query hangs.
When the
hang issue occurred, please check if consume high RAM or CPU. Just a confirmation, thanks for your understanding.
In addition, please use the WMI Diagnosis Utility and check if can help you to analyze this issue. for more
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WMI Diagnosis Utility
WMIDiag 2.1 is here!
If any update, please feel free to let me know.
Hope this helps.
Best regards,
Justin Gu

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Gengsheng

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" spatial_column=\"GEOM\"\n" +
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(shownodes.equals("true") && showndlabels.equals("true")?
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" path_styles=\"L.PH\"\n") : "") +
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" </theme> \n" +
(runanalysis.equals("true") &&
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" <jdbc_network_query \n" +
" network_name=\"" + networkName + "\"\n" +
" network_level=\"1\" \n" +
" jdbc_srid=\"" + srid + "\"\n" +
" datasource=\"" + dataSource + "\"\n" +
" analysis_algorithm=\"" + algorithm + "\"\n" +
" shortestpath_style=\"L.DPH\"\n" +
" shortestpath_startnode=\"" + startnode + "\"\n" +
" shortestpath_endnode=\"" + endnode + "\"\n" +
" shortestpath_startstyle=\"M.STAR\"\n" +
" shortestpath_endstyle=\"M.CIRCLE\"\n" +
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"</themes>\n" +
"</map_request>\n";
in this request, other themes and JDBC network query theme work except the JDBC query theme. I guess the style or format in the following are not right.
" spatial_column=\" geom \"\n" +
" SELECT geom from contour where time='01-JUL-07' \n" +
Anyway, I hope you can give me instructions.
Gengsheng

Oracle 9.2.0.6; query hangs if partition doesn't exist

Hallo all,
this is the first time I post on this forum.
I work in a group of PL\SQL developers in Italy. Few day ago we had a problem with a query and like to find out what the problem is.
We have an Oracle DB version 9.2.0.6 (old I know) in a production environment. Linux OS.
The query was made to extract data from a partitined table, on a partioned field, in our casa one Year. By mistake we have serced for the wrong year, 2013. There where no data for that year and therefor no partition.
So, happened that the query hangs and after 24 hours was terminated.
What we expected indeed was a zero records retirned in, at the most, few minutes, see that the table, in severa partition contains about 16 million records.
The we tested the same query but in a different enviroment, Oracle 11gr2, same table structure, same partitioning, without partition 2013, and the query completed in less tha 1 minute with zero records in output.
At this point we thought of a bug, but can't find any reference.
Has anyone had a similar experience or can give some indication of possible bug report.
Thanks for any help.

Hi Rob,
thank you for your answer.
Sorry if this is not the best forum. I am not very practical.
I try to answer to your questions.
At a first time we thought the query did a full scan on the table. Yes. But even to full scan 16.000.000 records split in no more than 8 partition (at this time) shouldn't take up to 24 hours and never stop running. I think.
We don't have a DBA role so we do not have full control over what is running. And take too long time to open a ticket and ask the DBA to check.
What we did is testing the same query in a pre-prod environment, which is an Oracle 11gr2.
I understand that it is not very usual to have a pre-production environment with a latest version of oracle but this is the way we have to work.
Anyway, the test in pre-production worked very well. Without 2013 partition the return was very fast and we had zero records as expected.
Then we found a workaround for production, ora 9. Call it work around maybe is too much ........
We created the 2013 partition and run the query. The respons was then succesfull in about the same time than in pre-prod. Less than one minute and zero records.
And this is fine for us.
What we don't understand is why this different behavior with two different version of DB. Thats why we think it is due to a bug. We only want to find out whether it is this or if there is a different reason.
Some other response or help would help.
Thank you.

JDBC query against Sybase through jConnect5.5 in Oracle 9i Reports Builder

Hi There,
I am trying to connect to Sybase using JDBC query using jConnect55 driver.
I am not able to do so. I get an error:
ERR 62002: Failed to connect to the datasource JZ0D5 JZ0D5: Error loading protocol com.sybase.jdbc2//255.255.255.255//255.255.255.255
Driver entry in my jdbcpds.conf file is
<driver name ="jConnect55"
subProtocol ="sybase"
connectString ="mainProtocol:subProtocol://databaseName"
class = "com.sybase.jdbc2.jdbc.SybDriver"
connection = "oracle.reports.plugin.datasource.jdbcpds.JDBCConnectionHandling" loginTimeout = "0">
<property name="DatabaseName" value="tempdb"/>
</driver>
The entry I make in jdbc query connection dialog box is as under:
User Name:test
password:secret
Databse: 255.255.255.255:9999/tempdb
Driver Type: jConnect55
Can you point me where I am wrong?
Thanks in advance
Ketan Patel

Hi Sachin,
I too, got through the issue. Sorry am bit late in updating you. But still I would say it is not on consistent(my feedback as per I grabbed from the behavior. Say, I accepted the query in a particular order of WHERE clause, then If I change the order it will throw an error message saying "Incorrect syntax".)
Anyway working fine. Thanks for your immediate response with useful hints.
Rgds
Anand
Hi Anand,
Yes, JDBCPDS accepts all Select queries which follows SQL Specification.
It would be a valid query as per the database used.
Please try again, Bind parameters can be placed in any or all of the conditions of SQL Query in JDBCPDS.
I am able to use them in both the cases you told.
With Regards
Reports team

JDBC Query using PL/SQL

I have gotten this to work in my Reports class but can not get this to work at my company. Basically I'm trying to use the JDBC query in Report Builder.
Here is my Ref Cursor Code:
CREATE OR REPLACE PACKAGE SCOTT.types is
type sqlcur is REF cursor;
end;
Here is my Pl/SQL function:
CREATE OR REPLACE FUNCTION SCOTT.test return Scott.types.sqlcur is
c1 Scott.types.sqlcur;
begin
open c1 for select * from scott.emp;
return c1;
end;
I can get this to work in SQL Plus by doing the following:
var r refcursor
exec :r := test;
print r When I go into Reports Builder->JDBC query I connect to the SCOTT db using tiger as the password. I type in the function name TEST and get the error "wrong number or types of arguments in call TEST". I have tried "call TEST" but that doesnt work either. If I use "call TEST" I get an error saying it expected characters ":=(@" etc....
I know my connection works because I can do a "select * from emp" and get results. Can anyone get this to work?
I'm running Report Builder 9.0.2.0.3
I have done multiple searches on this issue and most responses point someone to links that dont work or documentation. I have read them and my code above should work but doesnt........Please put some real examples or code that works with the "Scott" schema.
Thanks

hi Shawn
When running jdbc quesry based on SP with Oracle DB, the first parameter of the store procedure should be of ref cursor type and it shall be a OUT parameter.
For example:
CREATE OR REPLACE PACKAGE jdbcpdspkg AS
TYPE Empcur IS ref cursor ;
procedure proc_with_param (p_emp_cv out jdbcpdspkg .empcur, p1 in number, p2 in number , p3 in number, p4 in number , p5 in number) ;
Thanks
Rohit

JDBC query hangs server

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