GOOP queues and other stored references

need to ask this because Im not at the target machine to try it myself until Monday.
Re Endevo by ref Goop Wizard 3.0.5
I am using queues in process objects.
WHen I create the object I create the queue and store the queue reference in the attributes of the object.
Then I use the queue for controlling public status and shutdown functions etc..
Question is the following.
I ran into a glitch today whereby the queue refs and some other refs go invalid while the Goop repository is showing "live" objects.
The values of the refs are intact but they are invalid
Anyone have any Idea what I am describing?
Thank You
PS: I hope this isn't simply Labview not running. How can that be when I am using the object inspector. I don't yet get it.

No I do not think it is an error.
It turns out the queue and DAQ Task references go invalid because of the relationship of the endevo GOOP object to LabVIEW. (or so it seems) I think it is because the VI that created the object goes idle and so LabVIEW assumes the ref is no longer needed (despite any options settings. )
I am seeing the objects in the Goop repository however references to queues and Data acquisition tasks are invalidated as
soon as the VI that uses them goes idle.
It does not seem to afffect field point references or VIsa com ports and also all other data in the goop object seems fine. I guess thats because FP and VIsa are only strings
Its a real snag to me because I did not see it coming. Now I have to create the queue and reestablish the Daq tasks to insure it is valid
after the create method even if the object exists.
I prefer to use the create or look up existing feature of the method because it gives a lot of flexibility.
Thank You

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Intro
Any iTunes 7.x user who manages their own music library outside of the "iTunes Music" folder might be able to tell you that iTunes DOES NOT respond well after manually moving tracks from one place to another on their computer systems. In fact, any file you move becomes immediately unplayable in iTunes. And, if you're anything like I am, losing several years worth of song rating metadata and playlists is not a good incentive for change. However, one thing others might not be able to tell you is that there's an easy workaround for the problem and you get to keep your playlists, ratings and other info. Read on to learn about the workaround.
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The workaround is a simple hack I devised after recently transferring a good portion of my music library between hard disks and running into problems with iTunes. The fix steps provided below are intended to circumvent the problems with iTunes and give users the freedom to move songs and other media files on their computers while maintaining the integrity of both the ratings and the playlists. Meaning you won't need to manually update the song locations in iTunes one-at-a-time, which, at version 7.02 is the only way to accomplish this task using the program.
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Workaround Steps
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Note: All backslashes used in file paths have been converted to forward slashes so that they will adhere with MySpace XSS security validation checks. These altered paths can still be copy/paste into Windows Vista's Explorer program once the Username is changed to the User Account where the iTunes files reside.
Preparing for the Move
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iTunes Library XML (iTunes Music Library.xml)
Note: Vista users can find the Library XML at C:/Users/Username/Music/iTunes
iTunes Music Database (iTunes Library.itl)
Note: Vista users can find the Music Database at C:/Users/Username/Music/iTunes
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Execute the Fix
After your files are moved, complete the following steps to implement the fix.
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Hack the iTunes Library XML
Once the files are moved the Library XML file locations will be out of sync. Follow the steps below to update them so that they now reference the correct file locations.
1. Open the iTunes Library XML with a Text Editor with a Find/Replace function.
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Wrapping Up
Once the import process is complete iTunes will look almost exactly the way you left it, with the exception that some playlists have been duplicated and the number of songs may be a hair off. To fix this problem delete any duplicate playlists in the "Library" panel in iTunes. You can now test out the changes by selecting an item moved earlier and testing it out. All that's left from there is to let iTunes perform any automated analysis it needs to do and rock on.
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Holy Smokes:
I appreciate your detailed workaround post. My question is this: I use iTunes to keep everything organized (though I'm well aware of the shortcomings...) and can use the simple solution that Chris from CA posted, but I don't have room to consolidate everything. My read on consolidating is that you copy from wherever you have your music located (and right now my music is outside of the MyMusic/iTunes folder, as that backs up to my work server) and so you have to have enough room for all of your music to be copied (and then you delete it from its prior location). That's how Apple describes it in, e.g., http://docs.info.apple.com/article.html?artnum=301748. I ain't go that kind of room. Is there any way to make the move to a completely different PC by following the simple option? From the posting I just linked it sounds like you MUST consolidate whether you use you iPod to move things or use an external drive.
Of course, I can use your workaround, but I thought I'd ask first. Many thanks.
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wrapper.classpath=/d3/BC4J/lib/javax_ejb.zip
wrapper.classpath=/d3/BC4J/lib/jdev-rt.jar
wrapper.classpath=/d3/BC4J/lib/jbohtml.zip
wrapper.classpath=/d3/BC4J/lib/jboremote.zip
wrapper.classpath=/d3/BC4J/lib/jdev-cm.jar
wrapper.classpath=/d3/BC4J/lib/jbodomorcl.zip
wrapper.classpath=/d3/BC4J/lib/jboimdomains.zip
wrapper.classpath=/d3/BC4J/lib/collections.jar
wrapper.classpath=/d3/Apache/Apache/htdocs/onlineorders_html
#wrapper.classpath=/d3/Apache/Apache/htdocs/OnlineOrders_html/Onl
ineOrders.jar
# The following classpath entries are necessary for EJBs to run
in IAS or DB when
present
wrapper.classpath=/d3/lib/aurora_client.jar
wrapper.classpath=/d3/lib/vbjorb.jar
wrapper.classpath=/d3/lib/vbjapp.jar
# Oracle Servlet
wrapper.classpath=/d3/lib/servlet.jar
# Oracle Java Server Pages
wrapper.classpath=/d3/jsp/lib/ojsp.jar
# Oracle Util
wrapper.classpath=/d3/jsp/lib/ojsputil.jar
# Oracle Java SQL
wrapper.classpath=/d3/sqlj/lib/translator.zip
# Oracle JDBC
#wrapper.classpath=/d3/jdbc/lib/classes12.zip
# SQLJ runtime
wrapper.classpath=/d3/sqlj/lib/runtime12.zip
# Oracle Messaging
wrapper.classpath=/d3/rdbms/jlib/aqapi.jar
wrapper.classpath=/d3/rdbms/jlib/jmscommon.jar
# OJSP environment settings
#wrapper.env=ORACLE_HOME=/d3
# The next line should be modified to reflect the value of the
SID for your
webserver.
#wrapper.env=ORACLE_SID=cmpdb
#wrapper.env=LD_LIBRARY_PATH=/d3/lib
## Enable the flag below if you are using jdk 1.2.2_05a or above
#wrapper.env=JAVA_COMPILER=NONE
# Advanced Queuing - AQXML
wrapper.classpath=/d3/rdbms/jlib/aqxml.jar
#wrapper.classpath=/d3/rdbms/jlib/xsu12.jar
#wrapper.classpath=/d3/lib/xmlparserv2.jar
wrapper.classpath=/d3/lib/xschema.jar
#wrapper.classpath=/d3/jlib/jndi.jar
wrapper.classpath=/d3/jlib/jta.jar
oemreporting.properties=/d3/Apache/Jserv/oemreporting/oemreportin
g.properties
zones = root, oemreporting
wrapper.classpath=/d3/jlib/share-opt-1_1_9.zip
wrapper.classpath=/d3/jlib/caboshare-opt-1_0_3.zip
wrapper.classpath=/d3/jlib/marlin-opt-1_0_7.zip
wrapper.classpath=/d3/jlib/tecate-opt-1_0_4.zip
wrapper.classpath=/d3/jlib/ocelot-opt-1_0_2.zip
wrapper.classpath=/d3/jlib/regexp.jar
wrapper.classpath=/d3/jlib/sax2.jar
#wrapper.classpath=/d3/jlib/servlet.jar
wrapper.bin.parameters= -DORACLE_HOME=/d3
#wrapper.env=LD_LIBRARY_PATH=/d3/lib32
wrapper.env.copy=DISPLAY
wrapper.bin.parameters=-DORACLE_HOME=/d3
#wrapper.classpath=/d3/lib/vbjorb.jar
#wrapper.classpath=/d3/lib/vbjapp.jar
wrapper.classpath=/d3/classes/classesFromIDLVisi
wrapper.classpath=/d3/jlib/swingall-1_1_1.jar
wrapper.classpath=/d3/jlib/ewtcompat3_3_15.jar
wrapper.classpath=/d3/jlib/ewt-3_3_18.jar
wrapper.classpath=/d3/jlib/share-1_1_9.jar
wrapper.classpath=/d3/jlib/help-3_2_9.jar
wrapper.classpath=/d3/jlib/ice-5_06_3.jar
wrapper.classpath=/d3/jdbc/lib/classes111.zip
wrapper.classpath=/d3/classes
wrapper.classpath=/d3/jlib/oembase-9_0_1.jar
wrapper.classpath=/d3/jlib/oemtools-9_0_1.jar
wrapper.classpath=/d3/jlib
wrapper.classpath=/d3/jlib/javax-ssl-1_1.jar
wrapper.classpath=/d3/jlib/jssl-1_1.jar
wrapper.classpath=/d3/jlib/netcfg.jar
wrapper.classpath=/d3/jlib/dbui-2_1_2.jar
#wrapper.classpath=/d3/lib/aurora_client.jar
#wrapper.classpath=/d3/lib/xmlparserv2.jar
wrapper.classpath=/d3/network/jlib/netmgrm.jar
wrapper.classpath=/d3/network/jlib/netmgr.jar
wrapper.classpath=/d3/network/tools
wrapper.classpath=/d3/jlib/kodiak-1_2_1.jar
wrapper.classpath=/d3/sysman/jlib/netchart360.jar
wrapper.classpath=/d3/jlib/pfjbean.jar
wrapper.env=SHLIB_PATH=/d3/lib32
wrapper.env=LIBPATH=/d3/lib32
wrapper.classpath=/d3/ultrasearch/lib/isearch_midtier.jar
wrapper.classpath=/d3/ultrasearch/lib/isearch_query.jar
wrapper.classpath=/d3/ultrasearch/lib/jgl3.1.0.jar
wrapper.classpath=/d3/lib/mail.jar
wrapper.classpath=/d3/lib/activation.jar
wrapper.classpath=/d3/ultrasearch/jsp/admin/config
# Additions for iFS
## DO NOT REMOVE OR ALTER THE FOLLOWING LINE ....
# iFS true
# Uncomment if you want to use the same Jserv as other
applications
wrapper.classpath=/d3/9ifs/custom_classes
wrapper.classpath=/d3/9ifs/settings
wrapper.classpath=/d3/9ifs/lib/adk.jar
wrapper.classpath=/d3/9ifs/lib/email.jar
wrapper.classpath=/d3/9ifs/lib/http.jar
wrapper.classpath=/d3/9ifs/lib/release.jar
wrapper.classpath=/d3/9ifs/lib/repos.jar
wrapper.classpath=/d3/9ifs/lib/utils.jar
wrapper.classpath=/d3/9ifs/lib/webui.jar
wrapper.classpath=/d3/9ifs/lib/provider.jar
wrapper.classpath=/d3/jlib/javax-ssl-1_2.jar
wrapper.classpath=/d3/jlib/jssl-1_2.jar
wrapper.env=ORACLE_HOME=/d3
wrapper.env=ORACLE_SID=cmpdb
wrapper.env=LD_LIBRARY_PATH=/d3/lib:/d3/ctx/lib:/d3/lib32
wrapper.env=NLS_LANG=.US7ASCII
## Additions for the iFS zone
# Uncomment if you want to use the same Jserv as other
applications
zones=ifs
ifs.properties=/d3/Apache/Jserv/etc/ifs.properties
# End iFS section

About your home page; Manually set up Firefox with the window(s) and tab(s)
the way you want them to be. Then;
'''''Firefox Options > General > Homepage'''''.
Press the button labeled ''''Use Current'''.'
=====================================
Open a new window or tab. In the address bar, type '''''about:config'''''.
If a warning screen comes up, press the '''''Be Careful''''' button.
This is where Firefox finds information it needs to run.
At the top of the screen is a search bar. Enter '''''browser.newtab.url'''''
and press enter. '''''browser.newtab.url'''''
tells Firefox what to show when a new tab is opened.
If you want, right click and select '''''Modify'''''. You can change the
setting to; about:home (Firefox default home page), 
about:newtab (shows the sites most visited), 
about:blank (a blank page), 
or you can enter any web page you want. 
The same instructions are used for the new window setting, listed as
'''''browser.startup.homepage'''''.

Parallel process with a queue and file?

Hello, first of all sorry for my bad english^^:
I am working for days on my project where I have to show the parallel process while transfering information by different ways and their problems (like timing and so on).
I chose the transmission of information to a parallel process by (1) a queue, and by (2) a file (.txt). (other ways are welcome, do you have 1-2 other ideas?)
To solve this problem I made three while loops, the first one is the original one, where the original information (as a signal) is created and send by queue and file to the other two while loops, where this information is getting evaluted to create the same signal.
so in the end you can compare all signals, if they are the same - so that you can answer the question with the parallelity of process.
but in my vi file i have some problems:
the version with the queue works pretty fine - it's almost parallel
but the version with file doesn't work parallel, and i have no idea how i can solve it - -
i'm a newbie^^
can someone correct my file, so both (file and queue version) run parallel with the original one, or tell me what i can or must do?
Attachments:
Queue_Data_Parallel_FORUM.vi ‏23 KB

LapLapLap wrote:
Hello, first of all sorry for my bad english^^:
I am working for days on my project where I have to show the parallel process while transfering information by different ways and their problems (like timing and so on).
I chose the transmission of information to a parallel process by (1) a queue, and by (2) a file (.txt). (other ways are welcome, do you have 1-2 other ideas?)
To solve this problem I made three while loops, the first one is the original one, where the original information (as a signal) is created and send by queue and file to the other two while loops, where this information is getting evaluted to create the same signal.
so in the end you can compare all signals, if they are the same - so that you can answer the question with the parallelity of process.
but in my vi file i have some problems:
the version with the queue works pretty fine - it's almost parallel
but the version with file doesn't work parallel, and i have no idea how i can solve it - -
i'm a newbie^^
can someone correct my file, so both (file and queue version) run parallel with the original one, or tell me what i can or must do?
A queue is technically never parallell, though you can have several if you really need parallellism. Other methods include Events, Action Engines, Notifiers (and why not webservices) for information transfer between processes.
Due to limitations in the disk system you can only read/write one file at a time from one process, so i wouldn't recommend that. If you use a ramdisk it might work.
/Y
LabVIEW 8.2 - 2014
"Only dead fish swim downstream" - "My life for Kudos!" - "Dumb people repeat old mistakes - smart ones create new ones."
G# - Free award winning reference based OOP for LV

What is the difference between using a global variable,passing a valuee and using a reference?

I have created a project that consists of several VIs. Only the main VI has a front panel and the others perform functions. The function VIs are dependent on controls on the main VI's front panel. I have several ways of passing the value of the controls. One is to use a global variable and just place it on the dependent VIs. Another option is to strictly connect the terminal from the control to a VI connector block and pass the value directly. My last option is to create a reference of the control and reference it inside the dependent VIs, but this would also require connections to be made to the VI block.
What are the advantages/disadvantages of these options?
-Stephen

5thGen wrote:
I have created a project that consists of several VIs. Only the main VI has a front panel and the others perform functions. The function VIs are dependent on controls on the main VI's front panel. I have several ways of passing the value of the controls.
1) One is to use a global variable and just place it on the dependent VIs.
2) Another option is to strictly connect the terminal from the control to a VI connector block and pass the value directly.
3) My last option is to create a reference of the control and reference it inside the dependent VIs, but this would also require connections to be made to the VI block.
What are the advantages/disadvantages of these options?
-Stephen
1) Globals are evil and introduce race conditions.
2) The sub-VI only get the value when it was called and updates that occur while the sub-VI is runing are not sensed by the sub-VI
3) This uses property node "value" or "value signaling" both of which run the user interface thread which is single-threaded and you incur a thread swap hit to performance. You also have a potential for race conditions.
The are various methods for sharing dat to/from sub-VI which include Queues and Action Engines.
I hope that hleps,
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

On Threads, Pools and other beasts

I'm seeing some unexpected behaviours in our production system relating to
(AFAICS) threads and connection pools, and hope you could bring some info
about them.
Our system is built over 4 PIII Xeon processors under Linux.
We do currently have this configuration:
15 threads for the "default" queue and 10 for an special servlet one, we
decided to separate threads in two queues in order to assure our users get
always a thread besides what the rest of the system is "doing".
Even we do not have a lot of users (about 20 or so) they do generate a lot
of load as for the bussiness logic inherent to the application.
For sample, so you can understand what goes with practically any user
"action", think on this.
After a user "confirms" some data via a servlet and after executing the data
validation and bussines rules some messages are sent via JMS to the
"asynchronous" part of the system (that is running in the same weblogic
instance). After commiting the user transaction an thus releasing the
servlet thread, so it can be used by the same or other user, JMS messages
are delivered to MDBs that must transform information from on-line (servlet)
processes in different ways so they can be stored onto other systems, i.e.
into a mainframe, into an XML DB and possibly into another RDBMS. Our
configuration is that there can be as much as 10 MDB of each type (I mean
for each kind of "action" of a servlet) running concurrently and as you can
suppose those processes do take some time to communicate with destination
systems and perform their work.
We end at last with a lot of concurrent processes in our system that ends
some time with the users complaining about system responsiveness.
After all this explanation I would like to know if 25 threads for
"background" and on-line processes is too low (as I'm afraid they are). The
problem is we can't seem to increase the number of threads without being
very careful with JDBC connection pools.
Currently we have two connection pools. We do demarcate transactions in the
clients (servlets, batch processes) we have a "transacted" pool and a "non
transacted" one.
We are delegating persistence to the contanier (formally in our case we are
using TopLink persistence and it uses in it's deployment descriptor both
types of pools)
Our configuration is as follows:
Oracle pool NON Tx 60 connections
Oracle pool Tx 30 connections
initially we create 5 connections for each pool with an increment of 5 for
each one too.
From the tests I have made I have discovered that setting more threads than
the minimum amount of pools yields to this exception:
weblogic.common.ResourceException: No available connections in pool
myNonTxPool
at
weblogic.common.internal.ResourceAllocator.reserve(ResourceAllocator.java:57
8)
at
weblogic.common.internal.ResourceAllocator.reserve(ResourceAllocator.java:40
5)
at
weblogic.common.internal.ResourceAllocator.reserveNoWait(ResourceAllocator.j
ava:373)
at
weblogic.jdbc.common.internal.ConnectionPool.reserve(ConnectionPool.java:165
at
weblogic.jdbc.common.internal.ConnectionPool.reserveNoWait(ConnectionPool.ja
va:126)
at
weblogic.jdbc.common.internal.RmiDataSource.getPoolConnection(RmiDataSource.
java:194)
at
weblogic.jdbc.common.internal.RmiDataSource.getConnection(RmiDataSource.java
:219)
the behaviour I would expect is that in case a thread needs a connection and
there isn't any one available the thread may be blocked and it would receive
the connecion once one is released, of course as I can see in the stack the
ConnectionPool.reserveNoWait() method is behaving just the other way.
The main problem with this is that as you can see we are "forced" to spend
90 (60+30) connections to the DB (even we will never use more than 25
(15+10) simultaneously just because we must assure that at least there is
one "reserved" connection to each thread.
Our DBA thinks that it can't be possible that we spend such number of
connections that could be taken by another application(s) (as the DB is
shared with other apps)
Currently our DB system is not set as "multithreaded" so each connection
created against the DB is a process on the system and of course they are a
really scarce resource.
My question is. What would be a "fine" number of threads for an application
like this that is mainly "background-batch processing" but assuring on-line
users have their threads always available?
I have just another doubt (maybe this is not the right thread to ask for it
but...) how does the UserTransaction actually works? I mean, is the
connection given to the thread (and thus extracted from pool) as soon as the
thread begin it's work? or is it given in the instant of "commiting" to the
DB. I know maybe using TopLink changes default Weblogic CMP behaviour but I
would like to know what the "default" Weblogic behaviour is; and, what
happens when you don't start a transaction in the client and total execution
time exceeds 30 seconds? I have seen a rollback due to "exceeding" those 30
seconds althought I'm sure we do not open any transaction, what kind of
"transaction" is that? Is just a way of Weblogic to assure a thread is not
"locked" more than a certain period of time so the system never "stalls"?
Thanks in advance.
Regards.
Ignacio.

Hi Ignacio,
See my answer inline.
"Ignacio G. Dupont" <[email protected]> wrote in message
news:[email protected]...
I'm seeing some unexpected behaviors in our production system relating to
(AFAICS) threads and connection pools, and hope you could bring some info
about them.
Our system is built over 4 PIII Xeon processors under Linux.
We do currently have this configuration:
15 threads for the "default" queue and 10 for an special servlet one, weThat numbers defines number of concurrent requests services
associated with that queues can handle. If monitoring CPU utilization
shows that CPU load is not high, let say less than 90%, - you can increase
that numbers.
decided to separate threads in two queues in order to assure our users get
always a thread besides what the rest of the system is "doing".
Even we do not have a lot of users (about 20 or so) they do generate a lot
of load as for the bussiness logic inherent to the application.>
For sample, so you can understand what goes with practically any user
"action", think on this.[eaten]
We end at last with a lot of concurrent processes in our system that ends
some time with the users complaining about system responsiveness.You will have to run a load test in your QA environment and play with queue
sizes. In addition, you may want to run a profiler (like JProbe or
OptimizeIt)
for maximum load to find if there are bottlenecks in the application.
After all this explanation I would like to know if 25 threads for
"background" and on-line processes is too low (as I'm afraid they are).The
It all depends of the usage pattern. I'd say that for a production
environment
with any noticeable load, it's low.
problem is we can't seem to increase the number of threads without being
very careful with JDBC connection pools.Yes, you will have to increase size of the pools to match maximum
number of ongoing transactions. Minimum would be a number of execution
threads. Actual number should be determined either by load testing or
by setting it to a guaranteed high level.
Currently we have two connection pools. We do demarcate transactions inthe
clients (servlets, batch processes) we have a "transacted" pool and a "non
transacted" one.
We are delegating persistence to the contanier (formally in our case weare
using TopLink persistence and it uses in it's deployment descriptor both
types of pools)
Our configuration is as follows:
Oracle pool NON Tx 60 connections
Oracle pool Tx 30 connections
initially we create 5 connections for each pool with an increment of 5 for
each one too.
From the tests I have made I have discovered that setting more threadsthan
the minimum amount of pools yields to this exception:That's quite natural.
weblogic.common.ResourceException: No available connections in pool
myNonTxPool[eaten]
the behaviour I would expect is that in case a thread needs a connectionand
there isn't any one available the thread may be blocked and it wouldreceive
That would lock exec threads very quickly. A connection pool is a vital
resource that is to be available constantly. So weblogic uses fail-fast
approach so that you can adjust setting to match highest load.
the connecion once one is released, of course as I can see in the stackthe
ConnectionPool.reserveNoWait() method is behaving just the other way.>
The main problem with this is that as you can see we are "forced" to spend
90 (60+30) connections to the DB (even we will never use more than 25
(15+10) simultaneously just because we must assure that at least there is
one "reserved" connection to each thread.That's right.
Our DBA thinks that it can't be possible that we spend such number of
connections that could be taken by another application(s) (as the DB is
shared with other apps)I don't think it's a correct observation. Oracle can be configured to handle
more connections. I saw weblogic pools configured to handle 200
connections.
Currently our DB system is not set as "multithreaded" so each connection
created against the DB is a process on the system and of course they are a
scarce resource.Application demand for resources should be satisfied.
My question is. What would be a "fine" number of threads for anapplication
like this that is mainly "background-batch processing" but assuringon-line
users have their threads always available?It should be high enough to satisfy requirement to handle given number
of concurrent requests processed on given hardware. Normally this
is determined by load testing and gradual increase of this number
to the point where you see that hardware (seen as CPU load)
cannot handle it. Buy the way this point sometimes is unreachable
as application becomes DB-bound, i.e. bottleneck is shifted to
the database.
I have just another doubt (maybe this is not the right thread to ask forit
but...) how does the UserTransaction actually works? I mean, is the
connection given to the thread (and thus extracted from pool) as soon asthe
thread begin it's work? or is it given in the instant of "committing" tothe
It's given when a connection, assuming it's obtained from TxDatasource,
is requested.
DB. I know maybe using TopLink changes default Weblogic CMP behavior but I
would like to know what the "default" Weblogic behavior is; and, what
happens when you don't start a transaction in the client and totalexecution
time exceeds 30 seconds? I have seen a rollback due to "exceeding" those30
seconds although I'm sure we do not open any transaction, what kind of
"transaction" is that? Is just a way of Weblogic to assure a thread is notFor instance, stateful session beans are transactional.
"locked" more than a certain period of time so the system never "stalls"?Basically, no, it's not. There is no way to "unlock" thread after certain
period.
So when a queue has finished processing, TX monitor checks the timeout,
and if there is one, issues a corresponding rollback. So, it's possible
for thread to run for 10 hours if the timeout is 30 seconds.
Since 7.0 weblogic is capable of detecting such situations so that
administrator can be informed about it and required actions can be
taken [on application side].
Hope this helps.
Regards,
Slava Imeshev

Weak and Strongly Typed Reference Cursors in Reports

Our custom reports has been using a reference cursor. I have inherited the code and not sure why there is a need to use a reference cursor when it can be done by a simple select statements. I see no dynamic select statements passed or any special parameters to reason out for use of reference cursor in our custom reports. Prior developers had reason out the benefits of using reference cursor for performance. I tested this by running a report with reference cursor versus plain select statement and still the report that is using the plain select statement performed better (faster) than the report that has the reference cursor, there is a big difference.
I have seen some disadvantage of using reference cursor on the reports that when there is a database object change even if the package that sourced the reference cursor has not been updated or modified the reports needs to be recompiled each time we get this error message coming from the report server queue:
Terminated with error: REP-8: Run time error in the PL/SQL development
environment (DE). PDE-PSD001 Could not resolve reference to <Unknown Program Unit>
while loading <Unknown> <Unknown>. REP-0008: Unexpected memory error while
initializing preferences.In 9iAS reports prior version the error is occurring rarely. When we moved to 10.1.2.2.0 reports it appears the error occurs most often. We have made an effort to research about the issue and appears to be a bug. One suggestion is to use a strongly typed reference cursor. I have tried to researched about the difference between a weak and strongly typed reference cursor but failed to understand them. I appreciate any help about examples differentiating a weak versus a strongly typed reference cursors.
Thanks,
Warren

I guess my point, for what it's worth, is that whether you use only a strongly typed REF CURSOR, or whether you also use a weakly typed REF CURSOR, you may still end up getting the REP-0008 error (at least if your report is in .REP format). You can avoid this by using a pipelined function instead (or by putting the SQL directly in the report, or possibly by using .RDF or .JSP format).
To test this, you might:
1. Create a database package with an SQL*Plus script that that looks something like this:
CREATE OR REPLACE PACKAGE TEST AS
 TYPE RECORD_TYPE IS RECORD
 USERNAME ALL_USERS.USERNAME%TYPE
 TYPE TABLE_TYPE IS TABLE OF RECORD_TYPE;
 TYPE WEAKLY_TYPED_REF_CURSOR_TYPE IS REF CURSOR;
 TYPE STRONGLY_TYPED_REF_CURSOR_TYPE IS REF CURSOR RETURN RECORD_TYPE;
 FUNCTION GET_WEAKLY_TYPED_REF_CURSOR RETURN WEAKLY_TYPED_REF_CURSOR_TYPE;
 FUNCTION GET_STRONGLY_TYPED_REF_CURSOR RETURN STRONGLY_TYPED_REF_CURSOR_TYPE;
 FUNCTION GET_PIPELINED_TABLE RETURN TABLE_TYPE PIPELINED;
END TEST;
CREATE OR REPLACE PACKAGE BODY TEST AS
 FUNCTION GET_WEAKLY_TYPED_REF_CURSOR RETURN WEAKLY_TYPED_REF_CURSOR_TYPE
 IS
 cWeaklyTypedRefCursor WEAKLY_TYPED_REF_CURSOR_TYPE;
 BEGIN
 OPEN cWeaklyTypedRefCursor FOR
 SELECT USERNAME FROM ALL_USERS;
 RETURN cWeaklyTypedRefCursor;
 END GET_WEAKLY_TYPED_REF_CURSOR;
 FUNCTION GET_STRONGLY_TYPED_REF_CURSOR RETURN STRONGLY_TYPED_REF_CURSOR_TYPE
 IS
 cStronglyyTypedRefCursor WEAKLY_TYPED_REF_CURSOR_TYPE;
 BEGIN
 OPEN cStronglyyTypedRefCursor FOR
 SELECT USERNAME FROM ALL_USERS;
 RETURN cStronglyyTypedRefCursor;
 END GET_STRONGLY_TYPED_REF_CURSOR;
 FUNCTION GET_PIPELINED_TABLE
 RETURN TABLE_TYPE PIPELINED
 IS
 BEGIN
 FOR rec IN
 SELECT USERNAME FROM ALL_USERS
 LOOP
 PIPE ROW(rec);
 END LOOP;
 END GET_PIPELINED_TABLE;
END TEST;
/2. Create a report based on REF CURSOR query using only a strongly typed REF CURSOR. The PL/SQL statement that you use in the report as the data source for the query might look something like this:
function QR_1RefCurDS return test.strongly_typed_ref_cursor_type is
begin
return test.get_strongly_typed_ref_cursor;
end;3. Compile the report to a .REP file and run it to make sure it works as expected.
4. Drop and re-create the TEST package in the database.
5. Try running the .REP file again. I expect you will get the REP-0008 error.
6. Modify the REF CURSOR query to use an underlying weakly typed REF CURSOR by changing the PL/SQL statement (from Step 2) to something like this:
function QR_1RefCurDS return test.strongly_typed_ref_cursor_type is
begin
return test.get_weakly_typed_ref_cursor;
end;7. Repeat Steps 3 through 5. I expect you will get the REP-0008 error again.
8. Replace the REF CURSOR query in report with an SQL query that looks something like this:
SELECT * FROM TABLE(TEST.GET_PIPELINED_TABLE)9. Repeat Steps 3 through 5. I expect you will not get the REP-0008 error.
Hope this helps.

List of Queues and Notifiers

Dear Sir/Madam,
1) I would like to be able to obtain a list of all queues and notifiers in memory. How to do so?
2) I would like to be able to change the behaviour of the queue. Instead of holding and waiting for an element to be read out of a full queue (when a new element in to be inserted), I would like to be able to push out the oldest element.
Any suggestions?
Thanks!
Regards
Albert

Thank you all.
Thans for the VI, but unfortunately I could not read it (version too high). However, I found "Smart Buffer" and "Recent History" VIs in the "Search Examples". Unfortunately, these are not applicable since I need to generate the queues and notifiers in undefined number of instances.
What I eventually did:
1) I would like to be able to obtain a list of all queues and notifiers in memory. How to do so?
Used a functional global variable VI which stored the names, as well as created/destroyed queues.
2) I would like to be able to change the behaviour of the queue. Instead of holding and waiting for an element to be read out of a full queue (when a new element in to be inserted), I would like to be able to push out the oldest element.
I used notifiers:
a) I call a VI that returns the status of the notifier, and I read all the available notifiers from it.
b) I append the new data to the one obtained from the notifier, and cut the result to limit the length of this "buffer".
c) I call a Send Notifier VI, which puts the new data set into the notifier.
This way is possible but uncomfortable...
DEAR NI Tech Support,
Please respond to the questions, and let me know, if there are more elegant solutions (e.g. reading a property node for the list of queues or notifiers, or writing a property node for setting the behaviour of the queue).
Thanking you in advance.
Sincerely
Albert Lysko
Message Edited by alysko on 12-10-2007 06:48 AM

GOOP queues and other stored references

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