Major EJB scalability limitation/bug

We have a system that uses WebLogic 4.5 for JSP and container-managed EJB
and started seeing really bad performance degradation under any sort of load
test. After a couple of days of debugging, I found that method calls on EJB
objects would get slower at a rate that was worse than proportionate to
the number of beans in the system. Calling a read-only method
("getUserName()") on a bean ("UserBean") would take around .2ms when there
is only one UserBean in the cache, around 2.5ms when there are 100 beans in
the cache, and around 100ms when there are 2000 beans in the cache.
After some poking around, I found that virtually all (96%) of the time was
going into the LRUCache manager, which has a lot of unnecessary debugging
code that recreates the entire cache hashtable on every method call. This
results in a huge number of allocations and inserts, and renders the system
basically unusable at any real user load.
Has anyone else seen this kind of performance degradation under WL4.5?
Anyone have a fix/workaround?

See the thread:
news://www4.weblogic.com/<7ru0hr$ell$[email protected]>
mbg
David Engberg wrote:
We have a system that uses WebLogic 4.5 for JSP and container-managed EJB
and started seeing really bad performance degradation under any sort of load
test. After a couple of days of debugging, I found that method calls on EJB
objects would get slower at a rate that was worse than proportionate to
the number of beans in the system. Calling a read-only method
("getUserName()") on a bean ("UserBean") would take around .2ms when there
is only one UserBean in the cache, around 2.5ms when there are 100 beans in
the cache, and around 100ms when there are 2000 beans in the cache.
After some poking around, I found that virtually all (96%) of the time was
going into the LRUCache manager, which has a lot of unnecessary debugging
code that recreates the entire cache hashtable on every method call. This
results in a huge number of allocations and inserts, and renders the system
basically unusable at any real user load.
Has anyone else seen this kind of performance degradation under WL4.5?
Anyone have a fix/workaround?--
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Similar Messages

Jserver and EJB Scalability

Hi all,
I was wondering what other peoples expereinces with the scalability of EJBs and Jserver are. We are currently in development of a system that uses this technology, but have found that even the jndi lookup is slow.
Also we seem to be able to open only 8-10 iiop connections to the db(this is possibly a large_pool issue).
Lastly we are thinking about throwing BC4J(JBO) from Jdev3.1 into the mix and running them as EJBs but this is even slower.
I would appreciate any ones comments about these issues and fixes.
Thanks
Mark

Hi Mark. This is in answer to your email.
The large_pool setting is interesting. It depends on your bean size. I have a bean that takes up around 75K per session. So, depending on the number of sessions, I need to increase the large pool to be a multiple of 75K and the number of expected connections. Remember that the large_pool is only a portion of your shared_pool. This means that your large pool cannot be larger than your shared_pool. Also note, that the
large_pool defaults to 600K and that the java_pool is added to the overall total size of the SGA.
Do you know why we need the large pool? It is because the EJB service uses Multi threaded Server(MTS). The large pool stores all session information. Normally this is placed outside of the SGA in the PGA, however, once we use MTS, all that goes into the large_pool, and thus the need to size it properly.
Ahh, the number of connections is limited to the available free memory. Right now, I have sized my large pool to be around 2MB and that will allow for around 30 IIOP connections given my bean characteristics. So, you may find that you will have to add more memory if you are dealing with lots of connections. How many are you expecting?
Lastly, how an IIOP connection is made is interesting. If you use the standard lookup, it will create one connection per client application or calling application routine. IE. Using sess_sh will create one connection
per incarnation of this program. If you are using a threaded java application, using the standard lookup will result in one connection being used by all the threads. This may or may not be desirable. You would have to
open up named sessions for each thread. You can see an example of this in the JavaBeans and Corba developers guide, page 4-33 under the section Starting a Named Session from a client.
Starting multiple sessions is great sometimes. Oracle MTS will only allow so many sessions to be active. If you look at v$session and take not to the server column listed, you will see when that session is actually active. So, those connections are actually logical, as there are only so many MTS Servers that will do the actuall work. If you are severly hampered by memory issues, you may wish to create some sort of EJB
session name pool, however, this could get complex due to load balancing issues etc. I would recommend having Oracle's MTS take care of your connections for you, however this means more shared_pool/large_pool requirements.
Note on the JNDI Lookup. Yes, this is slow. So, I just perform the lookup once per session I am interested in creating, and always keep the reference to that object cached. So, yes it is slow using it the first time, after that, you get better performance. I would expect Oracle to come up with better performance as the product matures.
Good luck!
Brad
null

RESTFul URI parameter limitations/bugs

Hi,
I've run into some limitations (or bugs, don't know which is the most appropriate term at this point) regarding URI template parameters for RESTful Services. Here are a few examples to illustrate:
First limitation:
To start with, I define the following Resource Template: *example?p1={p1}&p2={p2}*
I use the following query as the GET handler: select :p1, :p2 from dual
This works fine, the URL example?p1=foo&p2=bar gets a json response like this: {":1": "foo",":2": "bar"}
I then create a second Resource Template with only the first parameter from the previous template: *example?p1={p1}*
I use the following query as the GET handler: select :p1 from dual
This works as expected, however now the previous template returns the following: {":1": "foo&p2=bar"}, i.e. the part of the URI string after p1= gets parsed as a single parameter.
Second limitation:
I define the following resource template: *example1/{p1}*
I use the following query as the GET handler: select :p1 from dual
Works fine.
I then define the following resource template: *example1/{p1}/example2*
I use the same query again as the GET handler: select :p1 from dual. This time the whole part of the URI string from {p1} forward gets parsed as the p1 parameter, which means it returns {":1":"foo/example2"} rather than {":1":"foo"}. However, if I remove the example1/{p1} template, the example1/{p1}/example2 works as expected.
In both cases, it seems like the rules for URI templates are excessively strict regarding URI similarities with other templates. I've been unable to find any reference to this in the documentation, other than a vague reference to a lack of support for "optional parameters".
Assuming these are known limitations rather than bugs, might they be removed in a future release?
Versions:
APEX Listener 2.0.1
WLS 10.3.6 on Windows 2008 R2 (64-bit)
Oracle DB 11.2.0.3
APEX 4.2.1
Thanks,
Tobias

TobiasE wrote:
Hi,
I've run into some limitations (or bugs, don't know which is the most appropriate term at this point) regarding URI template parameters for RESTful Services. Here are a few examples to illustrate:
First limitation:
To start with, I define the following Resource Template: *example?p1={p1}&p2={p2}*
I use the following query as the GET handler: select :p1, :p2 from dual
This works fine, the URI example?p1=foo&p2=bar gets a json response like this: {":1": "foo",":2": "bar"}
I then create a second Resource Template with only the first parameter from the previous template: *example?p1={p1}*
I use the following query as the GET handler: select :p1 from dual
This works as expected, however now the previous template returns the following: {":1": "foo&p2=bar"}, i.e. the part of the URI string after p1= gets parsed as a single parameter.
This is when you need to use the priority value to help the listener choose the most appropriate URI Template. Hopefully I can explain what is actually happening and make this a bit clearer.
The important thing to realise is that a URI Template matches any characters, characters which you might assume are significant to the matching algorithm, the characters which act as delimiters in the URI and query string syntax are not treated as delimiters, they have no special significance, *&*,*=*,*/*,*?* are all treated just the same as any other character . If you look at the final URI Template RFC [1] you can get a feel for how involved it gets trying to specify a URI Template syntax that can robustly match against all common URI patterns, and actually describe a syntax that is aware of the significance of these delimiters.
So it's your second Resource Template that is matching both URIs and the first one is not getting invoked at all.
*example?p1={p1}&p2={p2}* matches example?p1=foo&p2=bar, i.e. *{p1}* is mapped to foo and *{p2}* is mapped to bar
*example?p1={p1}* matches both example?p1=foo and example?p1=foo&p2=bar, i.e. in the first case *{p1}* is mapped to foo and in the second case *{p1}* is matched to: foo&p2=bar
In plain english the second template means ' match *{p1}* against any text occuring after: example?p1= '
So when faced with trying to find the appropriate resource template for the URI, listener finds two matching resource templates, which one does it choose?
The answer is it chooses the one with the highest priority, but if they are both the same priority, then (and admittedly this isn't documented anywhere, it may be subject to change in future releases) it chooses the resource template that requires the least number of parameters to achieve a match (this is just a basic heuristic to help make a choice, it's a bit of a coin toss whether it matches what the developer might have intended).
So the solution is to give the Resource Templates different priorities, it's up to you to figure out the order in which you want listener to match your templates that match a given URI. Give the template you want checked first the highest priority, the template you want checked second a lower priority.
So to fix this problem give *example?p1={p1}&p2={p2}* priority of 9 (or any value > the default of 0) and that should solve the problem
Second limitation:
I define the following resource template: *example1/{p1}*
I use the following query as the GET handler: select :p1 from dual
Works fine.
I then define the following resource template: *example1/{p1}/example2*
I use the same query again as the GET handler: select :p1 from dual. This time the whole part of the URI string from {p1} forward gets parsed as the p1 parameter, which means it returns {":1":"foo/example2"} rather than {":1":"foo"}. However, if I remove the example1/{p1} template, the example1/{p1}/example2 works as expected.
This is the same issue again really, change the priority of *example1/{p1}/example2* to be greater than the priority of *example1/{p1}*.
In both cases, it seems like the rules for URI templates are excessively strict regarding URI similarities with other templates. I've been unable to find any reference to this in the documentation, other than a vague reference to a lack of support for "optional parameters".
Assuming these are known limitations rather than bugs, might they be removed in a future release?
So as you can see these are known limitations, rather than bugs.
Without committing to anything, I would certainly like to support more of the final URI Template RFC, but as you can see if you read it, there is a fair bit of complexity involved in doing so. A large part of the problem is that URI Templates were really envisaged for the inverse of how we use them (and how other server side frameworks like RESTlet and .NET use them). URI Templates as specified are primarily intended to be used on the client side to form request URIs from a URI Template and parameter values. We're using them the other way round, trying to decode request URIs to match against templates and thereby extract parameter values (to pass into our queries).
For now I'm not in a hurry to add more support, until we see compelling cases where the above prioritization mechanism cannot solve the matching problem, so would be glad to hear back from you if find scenarios that are not supportable at the moment.
Regards,
Colm
[1] http://tools.ietf.org/html/rfc6570

Major issue's or bugs in 10gr2 dataguard?

We have implements the physical standy database in 10gr2. My manager what know about dataguard major issues or bugs in 10gr2 ? Please share your experience.
Appreciate your reply.

Dear user530956,
Please first check below link;
http://www.oracle.com/technetwork/topics/security/alerts-086861.html
Can you see any bug fixes about the Oracle Data Guard?
There could be always bugs but i don't know that 10gR2 has data guard bugs or bugs that affects the system critically. I have never faces a bug for the data guard.
Tell your manager to get you a metalink account and check the metalink for further information and articles about the Oracle Data Guard. You need more than people's experiences.
Regards.
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Blake|Social Media Specialist | Best Buy® Corporate
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I try to go to my Hotmail email and it wont let me go through. so I deleted cookies and still the same issue with my home page. It will not go to home page it just goes to a blank page. I do not want to constantly deal with this problem. You have bugs and everything else in this browser. Please work out the bugs.
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"Remove Cookies" from sites causing problems:
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MAJOR iMAC FONT BOOK BUG PROBLEM

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I'm having a major fontbook problem on my imac as of yesterday. I'm a graphic designer and for me this is an aboslute nightmare - a horror story. I lost all of my downloaded fonts yesterday (i opened font book because it didn't upload a new font that i had downloaded and wanted to see what was going on) and got the shock of my life. I am now having major issues with this software. On top of losing all of my downloaded fonts, I can't upload any new fonts anymore and for some reason it now has alot of chinese/hebru fonts loaded into it which is baffling.
I've been searching all over google for a way to resolve the problem and have no idea what to do now, nothing is working
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amlogan wrote:
for some reason it now has alot of chinese/hebru fonts loaded into it
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NX 2224 Etherchannel issues - 2224 limits - Bug or myself

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Hi,
i just looked and there is a known defect:
http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCtl68802
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Maximum number of EJBs (any limitation?)

Hi,
Does anyone know what is the limitation as to the number of stateless session beans within a J2EE application server (Weblogic or Websphere)? Has anyone tried with hundreds of them in a single EAR? I would appreciate a response of someone who could shed some light about this or could point me to some technical documentation about it.
Thank you,

Hello Alejca,
We have deployed multiple Stateless Session Beans [~20] with Maximum Bean Pool count as 100 and monitored the Performance.
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Thanks and regards,
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New Nintendo 3DS XL Consoles available for pre-order at Best Buy! Did someone say "Majora's Mask"?

I’m personally very excited to announce that Best Buy has now listed three New Nintendo 3DS XL consoles for pre-order on BestBuy.com! Now, you’ll not only be able to enjoy your favorite Nintendo 3DS games on the go, but you’ll be able to utilize your beloved amiibo figures as well with the added NFC capabilities. This is just one of the new features of Nintendo’s new 3DS XL consoles.
Here’s the most exciting part, in my opinion. Aside from a red and black option for the new 3DS XL consoles, Nintendo will also be releasing a Limited Edition Legend of Zelda: Majora's Mask 3DS XL! As a long-time fan of the Zelda series, I’ve been waiting for Majora’s Mask to come to Nintendo’s handheld systems and now, everyone will be able to enjoy not only the game itself, but a 3DS XL console made specifically for it!
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Legend of Zelda: Majora's Mask Limited Edition 3DS XL Console >
New Nintendo 3DS XL Console – Black >
New Nintendo 3DS XL Console – Red >
The new consoles will release on Friday, February 13th, so head over to BestBuy.com via the links above to procure your pre-orders!
Brian|Senior Social Media Specialist | Best Buy® Corporate
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I was able to place an order for the new 3DS XL MM Edition via bestbuy.com. My order shows processing so all seems well. My question is in regards to when this will ship? I usually use amazon.com for online preorders as they are shipped so that they arrive on release day. Is this the same with bestbuy.com? If not, would it be possible to switch to in-store pickup so that I can get the item on release day? Thanks.

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Non Recoverable System Fault :
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Edited by: 920456 on Apr 2, 2013 2:09 AM

Hi All,
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can somebody tell me Does Oracle SOA Suite - EJB Adapter version 3.0 has any runtime bugs ? etc.
Bcoz in the below link it is given something like EJB Version 2 Are Not Supported During Runtime. So, i want to check whether any bugs.
[Oracle SOA EJB Adapter Version bugs|http://www.oracle.com/technetwork/middleware/docs/aiasoarelnotesps5-1455925.html#intadapt]
Regards,
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Remove many records

Hi.
In SQL i can do like this "DELETE FROM customers WHERE id>100"
And there'll be only one call.
But if i use ejb, i should do next steps:
Collection coll = myHome.findByMoreId(long id);
Iterator iter = coll.iterator();
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Sounds like a vendor specific setting. It isgenerally not a good idea to code to a specific vendor
if
portability is at all a concern...It's vendor specific for server configuration to
increase speed. My code'll work everywhere, because i
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And my question was about ejb techonolgy. it's seems
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If i use JDBC why i should mix techonolgies. I can do
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I've just wanted to use only EJB. But I should useNot a realistic goal in "real world" enterprise environments, where EJBs must often collaborate with legacy infrastructures and prior history applications. However, if the enterprise is just starting up then it's a feasible goal, but a solid design should be in place first (80/20 rule).
jdbc for large select and delete, and EJB for insert
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Tony "Vee Schade" Cook

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2. The Query prompt selector has got outer rectangle which is around 1 mm wide around the combo box. This does not fit to our dashboard GUI design. Any way to remove the outer rectangle and just keep it like a normal combo box ?
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Please refer screenshot for further clarity.
little background: I am using BO 4, Dashboard designer, SP4
Query prompt selector selects values for BEx query variable. There are around 10 such queries selecting month, since all of them have same selection, I am using Query prompt selector to supply selection to all queries in Query Pannel.
Standard dropdown did not work - i mean in data insertion I am not able to select "Query Prompt", queries are grayed out. So I decided to use Query Prompt selector. It works correctly but has got above 3 issues.
Hope this was easy to understand
Waiting for suggestions now
Thanks a lot !

Dear Pratik,
I was also facing the same issue but got the solution.Instead of using prompt on
bex level use filter on Dashboard Level it will be solved.e.g if u r using year prompt on Bex level use year filter on Dashboard level .the problem will be solved .
Thanxs .
Tayyab

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