DataReader performance problem on network

Hi,
Can someone tell me how to speed up reading from cursor of procedure in case when I have Oracle Server on seperate computer in the network. In case when I have oracle server on same computer where application is started, fetching of results is more then 4x faster, regardles that computer is much slower then Server computer in network.
Application is written in C# .Net and i'm using Oracle's DataReader.
I tried to experiment with FetchSize on DataReader, but that didn't give me results I expected.

Based on what you described, the root cause of the problem is unlikely to be ODP.NET since you can get faster performance just by using a local DB.
Obviously, if your DB server is competing with lots of other network traffic, then performance will be slower.
In terms of what you can tune in your Oracle network settings, increase your SQL*Net packet size (SDU). Do this on both the client and server since Oracle will compare the two and choose the lower level between the two. Before 11g, the default was 2KB. With 11g, the default is 8KB. As such, if you have just the default SDU values with 11g client connecting to 10g DB server, your SDU size would be 2KB.
Max size is 32KB (or 64KB with 11.2.0.2).
Another recommendation, make sure to use the dedicated server network setting since performance seems to be the bottleneck, not memory. You can also tune dedicated server so that 20 to 30 shared servers per 500 sessions. Use one dispatcher for every 50-100 sessions.
This is all assuming that something in the DB network settings or your computer physical network is the problem. The problem could be misconfigured DB server settings as well. You could try running your .NET app on the remote DB server itself to see if you can get 4X faster performance...assuming the remote server is on Windows.

Similar Messages

Airport Extreme network performance problems - roaming network help!!

Hi! I have the following setup: ADSL2 Router (about 18Mbps down and 1.5Mbps up - tested by connecting laptop directly to modem), connected to Time capsule set up to "create network" in "bridge mode" 802.11n 2.4GHz. My desktop is connected directly to the Time Capsule - download speed is OK, upload speed is a mere fraction of what it is supposed to be, sometimes a mere 50Kbps. In the next room (about 5 meters and 2 walls away) speed on the wireless network drops to about a tenth of wha I get at the modem and I can not reliably use my apple TV in that same room as the bandwidth does not seem to cut it. I have an extra Airport Extreme base station but I can not seem to set it up to make the situation any better. If I set it up wireless to "extend the network" the speeds just drop further. If I try to set it up as a roaming network linking it directly to the time capsule via an ethernet cable as per the instructions from Apple, I would need to set the Time Capsule to be "distributing a public IP address", however whenever I try do this I just get a NAT error message saying I should switch to bridge mode (I have tried to change the subnet IP range, etc without any luck). If I switch to bridge mode and connect the airport extreme (also in bridge mode) I just get a network that is frozen . . . I am tearing my hair out : (( Is there a way to connect both the Time Capsule and the Airport Extreme to the modem/router to cast the same wifi network?? Or can I connect them to each other in bridge mode somehow?? Any suggestions will be much appreciated! Thanks

It would be a good idea to "hard reset" the "remote" AirPort Extreme (AEBS) to clear out any old and possibly conflicting settings. Hold in the reset button for 10-12 seconds. You'll see the amber light begin to blink more quickly during this process, just be sure to hold for the full 10-12 seconds and then release the reset button.
Check that the ethernet connection is from one of the LAN <-> ports on your "main" AEBS to the WAN (circle of dots icon) on the "remote" AEBS.
Open AirPort Utility and click Manual Setup
Click the Base Station tab located below the row of icons to assign a name for this AEBS, device password and adjust Time Zone settings
Click the Wireless tab
Wireless Mode = Create a wireless network
Wireless Network Name = Exact same name as your "main" AEBS wireless network
No check mark needed next to "Allow this network to be extended"
Radio Mode = Automatic
Radio Channel = Automatic
Wireless Security = Exact same setting as your "main" AEBS. Should be WPA2 Personal
Wireless Password = Same password as your "main" AEBS
Confirm Password
Click the Internet icon
Connect Using = Ethernet
Connection Sharing = Off (Bridge Mode)
Click Update to save settings and let the AEBS restart
Then, power down the entire network...all devices...order is not important
Start the modem first and let it run a moment
Start the next device attached to the modem the same way
Keep starting devices one at a time until the network is back up
You should be good to go.
Message was edited by: Bob Timmons

Performance problems with DFSN, ABE and SMB

Hello,
We have identified a problem with DFS-Namespace (DFSN), Access Based Enumeration (ABE) and SMB File Service.
Currently we have two Windows Server 2008 R2 servers providing the domain-based DFSN in functional level Windows Server 2008 R2 with activated ABE.
The DFSN servers have the most current hotfixes for DFSN and SMB installed, according to http://support.microsoft.com/kb/968429/en-us and http://support.microsoft.com/kb/2473205/en-us
We have only one AD-site and don't use DFS-Replication.
Servers have 2 Intel X5550 4 Core CPUs and 32 GB Ram.
Network is a LAN.
Our DFSN looks like this:
\\contoso.com\home
   Contains 10.000 Links
   Drive mapping on clients to subfolder \\contoso.com\home\username
\\contoso.com\group
   Contains 2500 Links
   Drive mapping on clients directly to \\contoso.com\group
On \\contoso.com\group we serve different folders for teams, projects and other groups with different access permissions based on AD groups.
We have to use ABE, so that users see only accessible Links (folders)
We encounter sometimes multiple times a day enterprise-wide performance problems for 30 seconds when accessing our Namespaces.
After six weeks of researching and analyzing we were able to identify the exact problem.
Administrators create a new DFS-Link in our Namespace \\contoso.com\group with correct permissions using the following command line:
dfsutil.exe link \\contoso.com\group\project123 \\fileserver1\share\project123
dfsutil.exe property sd grant \\contoso.com\group\project123 CONTOSO\group-project123:RX protect replace
This is done a few times a day.
There is no possibility to create the folder and set the permissions in one step.
DFSN process on our DFSN-servers create the new link and the corresponding folder in C:\DFSRoots.
At this time, we have for example 2000+ clients having an active session to the root of the namespace \\contoso.com\group.
Active session means a Windows Explorer opened to the mapped drive or to any subfolder.
The file server process (Lanmanserver) sends a change notification (SMB-Protocol) to each client with an active session \\contoso.com\group.
All the clients which were getting the notification now start to refresh the folder listing of \\contoso.com\group
This was identified by an network trace on our DFSN-servers and different clients.
Due to ABE the servers have to compute the folder listing for each request.
DFS-Service on the servers doen't respond for propably 30 seconds to any additional requests. CPU usage increases significantly over this period and went back to normal afterwards. On our hardware from about 5% to 50%.
Users can't access all DFS-Namespaces during this time and applications using data from DFS-Namespace stop responding.
Side effect: Windows reports on clients a slow-link detection for \\contoso.com\home, which can be offline available for users (described here for WAN-connections: http://blogs.technet.com/b/askds/archive/2011/12/14/slow-link-with-windows-7-and-dfs-namespaces.aspx)
Problem doesn't occure when creating a link in \\contoso.com\home, because users have only a mapping to subfolders.
Currently, the problem doesn't occure also for \\contoso.com\app, because users usually don't use Windows Explorer accessing this mapping.
Disabling ABE reduces the DFSN freeze time, but doesn't solve the problem.
Problem also occurs with Windows Server 2012 R2 as DFSN-server.
There is a registry key available for clients to avoid the reponse to the change notification (NoRemoteChangeNotify, see http://support.microsoft.com/kb/812669/en-us)
This might fix the problem with DFSN, but results in other problems for the users. For example, they have to press F5 for refreshing every remote directory on change.
Is there a possibility to disable the SMB change notification on server side ?
TIA and regards,
Ralf Gaudes

Hi,
Thanks for posting in Microsoft Technet Forums.
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Thank you for your understanding and support.
Regards.
We
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Thanks for helping make community forums a great place.

(new?) performance problem using jDriver after a Sql Server 6.5 to 2000 conversion

Hi,
This is similar - yet different - to a few of the old postings about performance
problems with using jdbc drivers against Sql Server 7 & 2000.
Here's the situation:
I am running a standalone java application on a Solaris box using BEA's jdbc driver
to connect to a Sql Server database on another network. The application retrieves
data from the database through joins on several tables for approximately 40,000
unique ids. It then processes all of this data and produces a file. We tuned
the app so that the execution time for a single run through the application was
24 minutes running against Sql Server 6.5 with BEA's jdbc driver. After performing
a DBMS conversion to upgrade it to Sql Server 2000 I switched the jDriver to the
Sql Server 2000 version. I ran the app and got an alarming execution time of
5hrs 32 min. After some research, I found the problem with unicode and nvarchar/varchar
and set the "useVarChars" property to "true" on the driver. The execution time
for a single run through the application is now 56 minutes.
56 minutes compared to 5 1/2 hrs is an amazing improvement. However, it is still
over twice the execution time that I was seeing against the 6.5 database. Theoretically,
I should be able to switch out my jdbc driver and the DBMS conversion should be
invisible to my application. That would also mean that I should be seeing the
same execution times with both versions of the DBMS. Has anybody else seen a
simlar situation? Are there any other settings or fixes that I can put into place
to get my performance back down to what I was seeing with 6.5? I would rather
not have to go through and perform another round of performance tuning after having
already done this when the app was originally built.
thanks,
mike

Mike wrote:
Joe,
This was actually my next step. I replaced the BEA driver with
the MS driver and let it run through with out making any
configuration changes, just to see what happened. I got an
execution time of about 7 1/2 hrs (which was shocking). So,
(comparing apples to apples) while leaving the default unicode
property on, BEA ran faster than MS, 5 1/2 hrs to 7 1/2 hrs.
I then set the 'SendStringParametersAsUnicode' to 'false' on the
MS driver and ran another test. This time the application
executed in just over 24 minutes. The actual runtime was 24 min
16 sec, which is still ever so slightly above the actual runtime
against SS 6.5 which was 23 min 35 sec, but is twice as fast as the
56 minutes that BEA's driver was giving me.
I think that this is very interesting. I checked to make sure that
there were no outside factors that may have been influencing the
runtimes in either case, and there were none. Just to make sure,
I ran each driver again and got the same results. It sounds like
there are no known issues regarding this?
We have people looking into things on the DBMS side and I'm still
looking into things on my end, but so far none of us have found
anything. We'd like to continue using BEA's driver for the
support and the fact that we use Weblogic Server for all of our
online applications, but this new data might mean that I have to
switch drivers for this particular application.Thanks. No, there is no known issue, and if you put a packet sniffer
between the client and DBMS, you will probably not see any appreciable
difference in the content of the SQL sent be either driver. My suspicion is
that it involves the historical backward compatibility built in to the DBMS.
It must still handle several iterations of older applications, speaking obsolete
versions of the DBMS protocol, and expecting different DBMS behavior!
Our driver presents itself as a SQL7-level application, and may well be treated
differently than a newer one. This may include different query processing.
Because our driver is deprecated, it is unlikely that it will be changed in
future. We will certainly support you using the MS driver, and if you look
in the MS JDBC newsgroup, you'll see more answers from BEA folks than
from MS people!
Joe
>
>
Mike
The next test you should do, to isolate the issue, is to try another
JDBC driver.
MS provides a type-4 driver now, for free. If it is significantly faster,
it would be
interesting. However, it would still not isolate the problem, because
we still would
need to know what query plan is created by the DBMS, and why.
Joe Weinstein at BEA
PS: I can only tell you that our driver has not changed in it's semantic
function.
It essentially send SQL to the DBMS. It doesn't alter it.

RMAN duplicate target database from active database - performance problem

Hello. I’m running into a major performance problem when trying to duplicate a database from a target located inside our firewall to an auxiliary located outside our firewall. Both target and auxiliary are located in the same equipment room just on different subnets. Previously I had the auxiliary located on the same subnet as the target behind the firewall and duplicating a 4.5T database took 12 hours. Now with the auxiliary moved outside the firewall attempting to duplicate the same 4.5T database is estimated to exceed 35 hours. The target is a RAC instance using ASM and so is the auxiliary. Ping, tnsping, traceroutes to and from target and auxiliary all indicate no problem or latency. Any ideas on things to consider while hunting for this elusive performance decrease?
Thanks in advance.

It would obviously appear network related. Have you captured any network/firewall metrics? Are all components set to full duplex? Would it be possible to take the firewall down temporarily and then test the throughput? Do you encounter any latency if you were to copy a large file across the subnets?
You may want to check V$RMAN_BACKUP_JOB_DETAILS, V$BACKUP_SYNC_IO or V$BACKUP_ASYNC_IO when the backup is running.

Performance problems after installing XP Service Pack 3

Hello,
After upgrading my client XP-machine to Service Pack 3, I have serious performance issues working with ApEx. Firstly, establishing the connection to the ApEx Workspace and then logging in both are very slow. Navigating through the workspace works fine, however when I then open any page for editing and/or try to run it, again it is very slow. As we work with PL/sql Embedded gateway I have changed the parameter SHARED_SERVERS to 10, but this did not make any difference. Remotely connecting to this server in other ways such as ping, connecting to xmlpserver, mapping network drives and connecting to the database all work fine.
My collegues also working witk Service Pack 3 have no performance issues. However when I performed a rollback of the XP Service Pack 3, the performance issue was gone!
Does anyone know of any issues similar to this problem?
Regards,
Ben van Dort

This issue is probably related to an update of InternetExplorer by Service Pack 3. Working with Firefox instead of IE gives no performance problems whatsoever.
Version of IE after Service Pack 3: 6.0.2900.5512.xpsp_sp3_gdr.080814-1236CO
Ben

Performance problem ECC / CRM WebUi

I have a performance problem when using CRM functionality FCC (a http i.e. bsp) aplication which makes a query in ECC system.(two systems are in different networks)
In real life user is waiting for response in CRM BSP like 60 seconds(really too much)
At CRM side:
When I look at CRM for overall dialog avg. response time is 806 ms with avg roll wait time is 436ms.
When I look at CRM for overall HTTP avg. response time is 244 ms with avg roll wait time is 194ms.
At ECC side:avg RFC(only there I can identify specified user with high times) response time for user is 7.577ms with a quite high DB avg response time 6310ms.
Generaly this is a big ECC system with avg dialog response time 612ms(and no other user complains)
How to improove this situation. Is the problem in ECC system ,CRM system or network? Would moving CRM system in ECC network improove performance dramatically or something else.
Should you need any other info do not hesitate

Thank you Juan
I wander do we neeed some more data to find main cause for performance problems.
I can organise moving CRM to ECC network(this engages many people of three company and downtime).
However if this does not bring significant improovment I will be "killled".
What to check to see main cause for performance problems

Performance Problem with File Adapter using FTP Conection

Hi All,
I have a pool of 19 interfaces that send data from R/3 using RFC Adpater, and these interfaces generate 30 TXT files in a target Server. I'm using File Adapters as Receiver Comunication Channel. It's generating a serious perfomance problem. In File Adpater I'm using FTP Conection with Permanently Conection, Somebody knows if PERMANENTLY CONECTION is the cause of performances problem ?
These interfaces will run once a day with total of 600 messages.
We still using a Test Server with few messages.

Hi Regis,
We also faced teh same porblem. Whats happening is that when the FTP session is initiated by the file adapter, then its getting done from teh XI server. Hence the memory of the server is also eaten up. Why dont you give a try by using 'per file transfer'.
If this folder to which you are connecting is within your XI server network then you can mount(or map) that drive to the XI server and use it with a NFS protocol of the file adapter and thereby increasing the performance.
Cheers
JK

ATV Performance Problems

Help smart people! I just got an ATV. I successfully synched my iTunes library with my ATV. My ATV is connected to my TV via HDMI and MacBook Pro via wireless. I can see all of "my movies" in my ATV menu. However, when I select one of my videos it's very slow, very choppy and then times out. My ATV has an unobstructed wireless signal and is connected via wireless "n". Anyone having similiar performance problems? Suggestions?

capaho wrote:
Create a secondary iTunes library....
I'm not so sure there really is such a thing as a "primary" iTunes library and a "secondary" iTunes library. An ATV can be synced to only one library at a time. Other libraries on the network can only be used for streaming. The "primary" and "secondary" library concept is an interesting if not artificial one.
This is Winston's nomenclature.
Personally I preferred the old Sources selection from 1.0/1.1. software.
While the combined sync/stream listings for the sync library are intended to help, I think they confuse new users and maintaining and sorting this 'merged list' I feel may be partly responsible for sluggishness in 2.0+.
You knew what the source of the media was - AppleTV itself (content synced), streamed content from named libraries (including the sync library by default).

Performance problems on a Oracle 11G with Windows 2008 64bits.

Hi everyone,
I have noticed that our db is going low and low every week. My server has 16GB RAM and 10GB are dedicated to the Oracle database, this is a 11.2.0.1 with Windows 2008 R2 SP1 64bits. I like to know acording to the nexts values what you guys recommend to adjust in the init.ora:
orcl.__db_cache_size=5402263552
orcl.__java_pool_size=33554432
orcl.__large_pool_size=33554432
orcl.__pga_aggregate_target=3657433088
orcl.__sga_target=6878658560
orcl.__shared_io_pool_size=0
orcl.__shared_pool_size=1308622848
orcl.__streams_pool_size=33554432
*.memory_target=10511974400
*.open_cursors=5000
*.optimizer_mode='RULE'
*.processes=300
Acording to the memory target on how values can be increased the processes, pga_agregate_target, etc.
Also we have problems related to the bug Bug 9593134 that “Connections to Oracle 11g are slow and can take anywhere from 10 seconds to 2 minutes.” there is a fix on linux by removing the dns names on it but anyone have experience on windows platforms?
Thanks for all and sorry for my english.
Regards.
Arturo.

Regarding the long connection times, have you tried using network packet capture software (such as Wireshark) to determine what the client computer is doing when a connection attempt is initiated?
The Oracle Database time model statistics, along with the system wide wait events may help you diagnose the non-connection related performance issues (you should not just look at the statistics, but instead capture the current values, wait a period of time, capture the statistics again, and compare the changes in the statistic values). A statspack report might also help you - but a 10046 trace at level 8 or 12 is more appropriate if you are able to identify a couple of sessions that experience performance problems.
I do not suggest just blindly modifying parameters, although I am curious to know:
* Why the session level parameter OPEN_CURSORS is set to 5000 - do you expect a single session to hold open 5,000 cursors?
* Why are you using the deprecated RULE based optimizer?
* Why is the MEMORY_TARGET parameter used when the SGA_TARGET and PGA_AGGREGATE target are specified?
Charles Hooper
http://hoopercharles.wordpress.com/
IT Manager/Oracle DBA
K&M Machine-Fabricating, Inc.

Performance problem - XML and Hashtable

Hello!
I have a strange (or not strange, we don't know) performance problem. The situation is simple: our application runs on Oracle IAS, and gets XML messages from an MQ, and we have to process them.
Sample message:
<RequestDeal RequestId="RequestDeal-20090209200010-998493885" CurrentFragment="0" EndFragment="51" Expires="2009-03-7T08:00:10">
     <Deal>
          <Id>385011</Id>
          <ModifyDate>2009-02-09</ModifyDate>
          <PastDuesOnly>false</PastDuesOnly>
     </Deal>
     <Deal>
          <Id>385015</Id>
          <ModifyDate>2009-02-09</ModifyDate>
          <PastDuesOnly>false</PastDuesOnly>
     </Deal>
</RequestDeal>(there's an average of 50000-80000 deals in the whole message)
After the application receives the whole message, we'd like to parse it, and put the values into a hashtable for further processing:
    Hashtable ht = new Hashtable();
    Node eDeals = getElementNode(docReq, "/RequestDeal");
    Node eDeal = (Element)(eDeals.getFirstChild());
    long start = System.currentTimeMillis();
    while (eDeal != null) {
      String id = getElementText((Element)eDeal, "Id");
      Date modifyDate = getElementDateValue((Element)eDeal, "ModifyDate");
      boolean szukitett = getElementBool((Element)eDeal, "PastDuesOnly", false);
      ht.put(id, new UgyletStatusz(id, modifyDate, szukitett));
      eDeal = eDeal.getNextSibling();
    logger.info("Request adatok betöltve.");
    long end = System.currentTimeMillis();
    logger.info("Hosszu muvelet ideje: " + (end - start) + "ms");The problem is the while statement. On my PC it runs for 15-25 seconds, depends on the number of the deals; but on our customer's server, it runs for 2-5 hours with very high CPU load. The application uses oracle xml parser.
On my PC there are Websphere MQ 5.3 and Oracle 10ias with 1.5 JVM.
On our customers's server there are Websphere MQ 5.3 and Oracle 9ias with 1.4 HotSpot JVM.
Do you have any idea, what can be the cause of the problem?

gyulaur wrote:
Hello!
The problem is the while statement. On my PC it runs for 15-25 seconds, depends on the number of the deals; but on our customer's server, it runs for 2-5 hours with very high CPU load. The application uses oracle xml parser.
On my PC there are Websphere MQ 5.3 and Oracle 10ias with 1.5 JVM.
On our customers's server there are Websphere MQ 5.3 and Oracle 9ias with 1.4 HotSpot JVM.
Do you have any idea, what can be the cause of the problem?All sorts of things are possible.
- MQ is configured differently. For instance transactional versus non-transactional.
- The customer uses a network (multiple computers) and you use a box (singlur) and something is using a lot of bandwidth on the network. Could be your process, one of the dependent processes or something else that has nothing to do with your system
- The processing computer is loaded with something else or something is artificially limiting the processing time of your application (there is a app that allows one to limit another app to one CPU.)
- At least one version of 1.4 had a xml bug that consumed massive amounts of memory when processing large xml. Sound familar? If the physical memory is not up to it then it will be thrashing the hard drive as it swaps virtual in and out.
- Of course virtual memory causing swaps would impact it regardless of the cause.
- The database is loaded.
You can of course at least get the same version of java that they are using. Actually that would seem like a rather good idea to me regardless.

Event ID 218 Copy of database 'Mailbox Database'- experienced a performance problem

Hi,
We have 16 GB of RAM for EXchange 2010 and 4 Processor and using iSCSI Starwind LUN.
Event ID : 218
Event Source : ExchangeStoreDB
Event Category :Database Recovery
the copy of database 'Mailbox Database - NYM' on this server experienced a performance problem. Failover returned the following
error: here is only one copy of this mailbox database (Mailbox Database - NYM). Automatic recovery is not available.
It occurs specially when the exchange backup start ; we are using window backup for taking exchange backup
I can see warnning of ESE below the event 218 - Information Store (3912) Mailbox Database - NYM: A request to write to the file "D:\Program Files\Microsoft\Exchange Server\V14\Mailbox\Mailbox Database 0959355037\Mailbox Database 0959355037.edb" at
offset 150801350656 (0x000000231c760000) for 32768 (0x00008000) bytes has not completed for 68 second(s). This problem is likely due to faulty hardware. Please contact your hardware vendor for further assistance diagnosing the problem.
Also,
1. How can I enable verbose logging to expert level for exchange MailboxDatabase.
2. What type performace counter need to be set for exchange database in Performance Monitor
Any Help ?
Thanks
Prakash

We had the same issue on our mbx server with Exchange 2010 Ent SP3, Win Svr 2008 R2 SP1 running on VMware v5.1 with Exchange dbs mounted to the VM via iSCSI LUNs on our NetApp SAN.
We escalated the ticket, and the Microsoft Exchange escalation team stated that the EIDs of the database corruption and automatic recovery seem to point to a hardware issue. And, they told us not to panic and that there was no need to rebuild the environment
and migrate the databases immediately. They instead asked us to focus all our efforts on solving the iSCSI environment issues, since each Exchange EID db corruption/ autorecovery would be preceded by some type of corresponding iSCI System EID.
We hence opened tickets with MS Storage Team and with NetApp support and worked on this ticket with input from all 3 groups.
After about a month an a half of troubleshooting & trial error- with tickets open with NetApp, MS Storage Team, and MS Exchange team, we finally seem to have applied a configuration change that worked.
NetApp support referred us to the following article relating to VMware:
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2039495
So, per NetApp support and MS Storage team, do the following:
1.    Manually dismount Exchange Databases on the mailbox server.
2.    Open Device Manager, Network Adapters, VMXNET3 Ethernet Adapter #3, Properties
3.   Change Small RX Buffers from the default 512 to the maximum 8192 using the drop down selector.
4.   Change the RX Ring #1 from the default 1024 to the maximum of 4096 using the drop down selector.
5.   Click OK and save the change.
6.   Re-mount the Exchange Databases
And, to our surprise, this seems to have done the trick. It seems like the issue is an iSCSI-related NIC setting all along.
Thanks,
Detrich

Airport multicast performance problems in u-verse IPTV bridge.

I have a bunch of airport hardware, two n expresses, a draft n extreme, and a 5th generation extreme. I've recently moved to a new house and have AT&T's u-verse multicast IPTV installed. I want to put my TV somewhere without wiring and was going to just do it using a dedicated 802.11n bridge formed from either the two expresses, or the draft n extreme (at the multicast source side) and an express as a receiver.
This seems to work from a functionality perspective, I get the multicast stream into the AT&T set-top box and can watch all of the channels for extended periods of time. The problem that I run into is that I have performance problems that result in the video stuttering, pixelating, and freezing for seconds to minutes at a time. I don't understand why this is the case. The HD stream is less than 9Mbps which should be easily handled by a 5Ghz, n-only link. The source and destination expresses are within 5 feet of each other with clear line-of-sight.
Does anyone have any experience with multicast streaming on aiport hardware? Is there some limitation in the airport implementation where multicast (UDP) packets trigger some sort of slowpath packet processing, so that packets are being dropped? Is there some reporting feature within airport utility that where I can look for diagnostics related to dropped or (extremely) delayed packets? Is there something about AT&T's use of multicast IPTV that is just incompatible with airport hardware?
Note that the u-verse gateway handles all of the IGMP in this situation, and that nothing else is on the network. Well, the 5th gen router is on the network and everything else I own is behind it on a different wifi network. The gateway is smart enough to filter out the multicast traffic so that the router doesn't see it.

Found a solution. Switching from Apple's built-in "create a wireless network" and "join a wireless network+allow ethernet clients" to a WDS network with a main and a remote solves all of the problems. It's not a great option because the WDS network forces me to select a fixed, 2.4Ghz channel, but the IPTV stream is only 8-ish Mbps which seems to be doable, even with all of the wireless networks floating around my house. I guess that it could be a bigger problem during peak wifi usage around here, but we'll cross that bridge when it happens.

I started getting a Timed Out error message on my iPhone 5 when browsing the web that reads Page could not be loaded. Connection timed out. I performed a Reset Network Settings and still get the error. What is the fix?

I started getting a Timed Out error message on my iPhone 5 when trying to browse the internet tthat reads Page could not be loaded. Connection timed out. I performed a Reset Network Settings and am still getting the error message. What is the fix?

Thanks so much for more direction.
I realized that I bought this iPod T4 about a year ago, so decided to check the date and it is still under the 1 year ltd. warranty until 21 Dec. I contacted Apple via Chat and was informed that the problem may lie in the version of iTunes I was running 10.7. Today Apple released v. 11 of iTunes which I was instructed to download. It's TOTALLY different from iTunes 10.7 - drastically different in fact.
The Apple Chat Rep set up a phone call appointment forl 8:00 pm ET tonight where another Rep will call me to make sure the restore was accomplished OK. With v. 11 of iTunes I can't even find the restore option!!! The phone Rep will have to help me navigate v. 11 of iTunes. It doesn't seem intuitive at all. Maybe it's just me?!?!
Thank you for sending this new link for firmware. It's not clear to me right now whether I'll need it or not. The phone Rep will probably somehow be able to resolve the problem. If not, they'll probably send me to the nearest Apple store if the problem is hardware, as it would be covered under the warranty. I will give another update as to what transpires as a result of the phone call with the Apple Rep.
Again, thank you so much for helping me.

SAP Screen Personas error "A problem with network connectivity has been detected"

Hi,
We just installed Personas release 100 SP02 and performed the
configuration steps necessary. But when we acces the url and logon to
personas we get the following erre
A problem with network connectivity has been detected.
Please check you connection and refresh your browser.
Any help to solve this issue would be appreciated.
Best Regards.

Please use this checklist to see if everything is correct:
1. restgui service handler class has CL_HTTP_EXT_ITS_BASIC
2. SPRO -> Sap screen Personas -> Maintain system has
       - 3 letter system id
       - "Server.Url" without typo and value in http(s)://<SERVER>:<PORT>/ format
       - "Service.Uri" without typo and value as /restgui
3, Note 2026487 is installed
4. If target system is different from source system then you are able to access the following
         - http(s)://<TARGETSERVER>:<PORT>/clientaccesspolicy.xml
         - http(s)://<TARGETSERVER>:<PORT>/crossdomain.xml
5. role is assigned to user under /n/persos/admin_ui -> User Maintenance -> Search -> Show user -> Role
If you still get error, then if you are using SSO, please check if you have configured login/create_sso2_ticket parameter correctly.
Thanks
Chinthan

DataReader performance problem on network

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