Jdbc query hangs

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?
I'm using jdk1.4.1 with ojdbc14.jar and the database is version 8.1.7.
Kind regards,
Jurgen

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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
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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
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(no
kidding).
Test app which connects to the same oracle instance and executes thestatement
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JDBC query hangs for 60 seconds

Hi,
I'm trying to perform a series of very simple queries on a 8.1.7 database with jdk1.4 and ojdbc14 drivers. Every now and then, a query just hangs for exactly 60 seconds before continuing, without throwing any kind of exception. This sometimes happens after a couple of hundred queries, but it can also be after 4 or five. I thought maybe the database runs out of cursors, but then I would get an exception right? After every query, I close the ResultSet and Statement, so it should work just fine. When I tested the same program on PostgreSQL 7.2, it worked perfectly. Is this a problem with the Oracle JDBC drivers, or am I missing something?
Here's the code of my simple test app:
import java.sql.*;
import java.io.*;
class JdbcTest {
public static void main (String args []) throws Exception {
DriverManager.registerDriver (new oracle.jdbc.OracleDriver());
Connection conn = DriverManager.getConnection
("jdbc:oracle:thin:@foo.bar.com:1521:BLABLA","test", "test");
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conn.close();
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Here's the thread dump:
"Signal Dispatcher" daemon prio=10 tid=0x009E8118 nid=0xdc4 waiting on condition
[0..0]
"Finalizer" daemon prio=9 tid=0x0003E6F0 nid=0xdd4 in Object.wait() [ab1f000..ab
1fd88]
at java.lang.Object.wait(Native Method)
- waiting on <02F81698> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:111)
- locked <02F81698> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:127)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:159)
"Reference Handler" daemon prio=10 tid=0x0003D2C0 nid=0xdd8 in Object.wait() [aa
df000..aadfd88]
at java.lang.Object.wait(Native Method)
- waiting on <02F81700> (a java.lang.ref.Reference$Lock)
at java.lang.Object.wait(Object.java:426)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:113)
- locked <02F81700> (a java.lang.ref.Reference$Lock)
"main" prio=5 tid=0x00034AB8 nid=0xdc8 runnable [7f000..7fc3c]
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:129)
at oracle.net.ns.Packet.receive(Unknown Source)
at oracle.net.ns.NetInputStream.getNextPacket(Unknown Source)
at oracle.net.ns.NetInputStream.read(Unknown Source)
at oracle.net.ns.NetInputStream.read(Unknown Source)
at oracle.net.ns.NetInputStream.read(Unknown Source)
at oracle.jdbc.ttc7.MAREngine.unmarshalUB1(MAREngine.java:931)
at oracle.jdbc.ttc7.MAREngine.unmarshalSB1(MAREngine.java:893)
at oracle.jdbc.ttc7.Oopen.receive(Oopen.java:105)
at oracle.jdbc.ttc7.TTC7Protocol.open(TTC7Protocol.java:586)
- locked <02FCA940> (a oracle.jdbc.ttc7.TTC7Protocol)
at oracle.jdbc.driver.OracleStatement.<init>(OracleStatement.java:385)
at oracle.jdbc.driver.OracleConnection.privateCreateStatement(OracleConn
ection.java:772)
at oracle.jdbc.driver.OracleConnection.createStatement(OracleConnection.
java:712)
- locked <02FCA890> (a oracle.jdbc.driver.OracleConnection)
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"VM Thread" prio=5 tid=0x009E5030 nid=0xde0 runnable
"VM Periodic Task Thread" prio=10 tid=0x009E6E00 nid=0xdd0 waiting on condition
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Running Web Layout Of JDBC Query in Oracle Report Builder 11g.

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javax.servlet.jsp.JspException: REP-4100: An attempt to execute data source failed.
JDBCPDS-62008:A SQL error occurred: {0}.
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For the more clarification, I have used JDBC Query as Data source type and Database connected via ODBC Driver in System DSN. The Driver selected from the drop-downs are jdbc-odbc.
Kindly explain the mistake I m doing.

How to use a jdbc query result to redirect to a variable html page

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Is this possible, if so then how?
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please, help!!
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uh, since i've already asked man, please gimme an answer if you know, it'll be appreciated.
OK, HERE'RE THE DETAILS:(as you requested them)
i have an html page where there's a textfield say "t1", the value of that text field is sent to the servlet which compares the value of the field with the value in Database, say "db1" in column say "column1".
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JDBC query theme in a JSP page

Hi, everyone
I tried to write JDBC query theme in a JSP page at MapViewer, but it did not work.
The following is the codes.
1.JDBC theme in a map request in XML
<theme name="jdbc_theme_contour">
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render_style="C.RED">
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" spatial_column=\" geom \"\n" +
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Gengsheng

Hi
Here is the map request in JSP
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" width=\"" + width + "\"\n" +
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" " + cx + ", " + cy + "\n" +
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" </Point>\n" +
" </geometricProperty>\n" +
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" datasource=\"" + dataSource + "\"\n" +
" spatial_column=\"GEOM\"\n" +
" render_style=\"C.RED\" >\n" +
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Hallo all,
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Hi Rob,
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Sorry if this is not the best forum. I am not very practical.
I try to answer to your questions.
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Hi Sachin,
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Rgds
Anand
Hi Anand,
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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;
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CREATE OR REPLACE FUNCTION SCOTT.test return Scott.types.sqlcur is
c1 Scott.types.sqlcur;
begin
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var r refcursor
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hi Shawn
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TYPE Empcur IS ref cursor ;
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Query hangs on Value Help

Hi,
We have created a query in which we are using quantity conversion ( defined in RSUOM ) , the target quantity is to be taken from a variable. The quantity conversions is running fine but when we do a value help for the target quantity variable in Portal, the query hangs. We are not facing any such issue in Bex Analyzer.
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Hello Manish,
This is clearly a Portal issue.
Probably an issue with BI Java.
I recommend you to update your BI Java components to latest patch recommended by Java SP_Patch Matrix.
If you are using Netweaver 7.0, please check the link below:
http://www.sdn.sap.com/irj/sdn/index?rid=/webcontent/uuid/6010addf-e096-2b10-8893-e98586d005f9 [original link is broken]
If you are using Netweaver 7.0 EHP 1 (7.01), please the this link:
http://www.sdn.sap.com/irj/sdn/index?rid=/webcontent/uuid/c098b21c-e56f-2d10-2aad-b13915b396a4 [original link is broken]
Applying the patches recommended should solve the issue.
Also, as a recommendation, run the BI Diagnostics - note 937697 - and correct the red alerts.
Best Regards,
Edward John

JDBC Query Single Row service Parse Query

Using JDBC Query Single Row service on an Oracle database,
I specify a SQL statement like this:
select abc, to_char(aDate, 'MM/DD/YYYY') from xyz where def = 123
then I click the "Parse Query" button to try to map the query results to my variables, but the mapping window gives me 3 fields instead of 2:
1. abc
2. to_char(aDate)
3. 'MM/DD/YYYY'
how do I let it understand that there are only 2 fields in the results so that I can map it properly?
thanks

Got a new minor issue unrelated to the above, but I don't want to flood this forum with another new topic, so I'll stick this new thing here.
I have a very simple process that only contains this JDBC Query Single Row service.
In this query single row service, at the bottom of the property sheet, there's a section where it says "number of rows retrieved"...
now, if I map this 'number of rows' to a variable (I set the variable's type as "int"), when I call my process (as a web service), it returns me nothing... all the output parameters are empty.
If I remove the mapping of "number of rows", that is, there's nothing in that bottom section. Then my process works correctly, all the output variables contain correct data from my database.
Has anybody encountered this? what's your solution please?

WMI query hanging

I have some code (VB Script) that is collecting CPU performance metrics from WMI. The code works well on all of the servers (identical servers) but after a period of time (8 hours, 30 hours, other random times) on some of the servers the query hangs.
After several hours (e.g. 8 hours) the query will work again on the server. I have used WBEMTEST to query the CIMv2 namespace to perform the same query on the server where WMI is having a problem and it also hangs.
The query eventually times out and does not return a value.
I have asked the team to rebuild WMI and after they completed the rebuild, the problem still occurs.
Since the code is only performing a read operation on WMI, I do not see how the query can cause the hang of WMI.
Any ideas on what I should do next?
Thanks

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
details, please refer to following articles.
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

Jdbc query hangs

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