APEX Application behaviour in a RAC setup

Hi
Caveat first: I'm pretty new to Oracle RAC and just looking into it as an option. We have an APEX application currently running in Oracle 11gR2 single node currently and are considering HA for this.
My question is: What would be the expected behaviour seen by a User of an APEX application, in the event of a node failure, when running with an OHS / RAC configuration? Will they get "transparent fail-over" and see nothing or will they see an error?
I appreciate I could post in the APEX forum, but feel that is probably more of a development forum and possibly someone here has had to look at things at this level.
I have read what I think may be the definitive reference for this:
http://www.oracle.com/technetwork/developer-tools/apex/learnmore/apex-rac-wp-133532.pdf
but while it covers most of what I want I don't believe I have found an answer to my question
This states:
"The Transparent Application Failover (TAF) feature of Oracle Net Services is a runtime failover for high-availability environments. It enables client applications to automatically reconnect to the database if the connection fails and, optionally, resume a SELECT statement that was in progress. The reconnection happens automatically from within the Oracle Call Interface (OCI) library. For applications that do insert, update or delete transactions, the application must trap the error when the failure occurs, rollback the transaction, and then resubmit. If the application is not written to be TAF aware, the session will get disconnected."
However (as I understand it) APEX runs in the database and would fail with the database, it isn't a typical "client application" connecting to Oracle via a TAF aware connection pool - it is essentially a large pl/sql package and TAF only covers SELECT statements not packages.
May be I'm over-reading this and it's simpler than that: APEX/Mod_plsql might just handle it?
- APEX User/HTTP session state is stored in database APEX: Understanding session state which is available on other nodes
- Mod_plsql in OHS can detect the error returning and reissues the request to good server and APEX on that instance can retrieve Users/HTTP state and process the request (APEX/RAC doc states mod_plsql can see an error from database and cleanup connection up and form a new connection, but not that it will retry the request for the client into other APEX/DB node).
I'm really just after a (transparent/non-transparent) statement based on experience, but an outline of how the components behave would be useful.
Thanks in advance
Dave

Hi
Any chance of getting that link outside of Metalink? - I'm trying to get our customer support id, but no luck at present.
I'm aware that APEX can run with RAC (as per the link I posted) - I'm really after next level info around behaviour in that environment.
Thanks
Dave

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PCP Configuration
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Hussein

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Hi 3ds/Niranjan,
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hosted or cloud ? Apex...
Re: Apex on Cloud?
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Regards,
Kiran

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Problem with logging in to apex application builder listener

I have problem with my settings and am posting this in hope that someone else out there had similar problem and solved it!
I am trying to use reverseproxy to access to our db through apex listener.
It's been all set-up and I can login to the application it self either through proxy or no proxy using the listener.
But when I try to login to apex application builder I cannot do it through proxy(with no proxy, it works).
It just refreshes the login page when I click login....
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In the firebug it is showing that below and few other request status as 302 moved temporariry
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Hello Sin K,
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GET /i/themes/theme_20/btn-bg.gif HTTP/1.1 Via: 1.1 GITS6ISA Cookie:
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OracleAS-Web-Cache-10g/10.1.2.0.2
(G;max-age=3600+360;age=0;ecid=121853469393,0) Date: Tue, 25 Jan 2011
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http://anupserver:7777/pls/apex/f?p=193:1 Accept-Language:
en-us,ar-ae;q=0.5 Accept-Encoding: gzip, deflate If-Modified-Since: Thu,
01 Jul 2010 08:25:41 GMT If-None-Match: "1a887e1-92-4c2c5105"
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET
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HTTP/1.1 304 Not Modified Date: Sun, 13 Feb 2011 12:42:01 GMT Server:
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GET /i/themes/theme_20/btn-bg.gif HTTP/1.1 Accept: */* Referer:
http://anupserver:7777/pls/apex/f?p=193:1 Accept-Language:
en-us,ar-ae;q=0.5 Accept-Encoding: gzip, deflate If-Modified-Since: Thu,
01 Jul 2010 08:25:41 GMT If-None-Match: "1a887e1-92-4c2c5105"
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET
CLR 1.1.4322; InfoPath.1; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152;
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HTTP/1.1 304 Not Modified Date: Sun, 13 Feb 2011 12:42:02 GMT Server:
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image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash,
application/vnd.ms-excel, application/vnd.ms-powerpoint,
application/msword, application/x-ms-application, application/x-ms-xbap,
application/vnd.ms-xpsdocument, application/xaml+xml, */* Referer:
http://anupserver:7777/pls/apex/f?p=193:1 Accept-Language:
en-us,ar-ae;q=0.5 Content-Type: application/x-www-form-urlencoded
Accept-Encoding: gzip, deflate User-Agent: Mozilla/4.0 (compatible; MSIE
6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; InfoPath.1; .NET CLR
2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729) Host:
anupserver:7777 Content-Length: 262 Connection: Keep-Alive
Cache-Control: no-cache

Hello Orton,
I think this has something to do with network access, may be a firewall restricting access to the server.
Thanks,
Machaan

Import of Apex Application to another instance takes a long time

Hi,
I have developed an apex application which is of size -24 MB .While importing the appl to another instance it takes a long time (few hours). The imported appl is working fine so far.
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The application is getting imported and running, so you do not really have a problem in hand.
24M is big, but not all that big to run for hours.
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APEX Application behaviour in a RAC setup

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