Reports serialising when column sort attributes used

If an Apex user has two sessions and runs the same report page in both, then if the report uses column sort attributes (rather than an ORDER BY in the SQL), the second is blocked by the first; once the first completes the second then runs and completes. This appears to be because the user preferences for column sorting are being updated each time, even if they have not been changed.
This application demonstrates the problem:
http://htmldb.oracle.com/pls/otn/f?p=15827:2
Create 2 sessions using that URL. The page has a report based on ALL_OBJECTS with an item "Owner" to filter on. Enter "%" in the first session and press Enter and the report will run, taking about 1 minute. Meanwhile in the second session enter a specific owner (or just XXX) and press Enter. The second report will finish just after the first finishes, even though when run alone it only takes half a second or so.
Is this a bug?

Hi Tony,
If you're using this on unauthenticated pages, then the sort preferences are stored per user for the APEX_PUBLIC_USER (or HTMLDB_PUBLIC_USER), which is potentially why you're seeing the serialisation/dead-locking.
Could you perhaps use the suggestion by Scott in this thread -
Re: Report sorting affected by other users
To use the session ID as the APEX user (or anything else you prefer), to mitigate the potential for the deadlock? (It's worth trying and should take just a few seconds to test in your sample app?).
John.

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Hello,
I answer you over your post.
Joe Bertram wrote:
Hi,
That's an interesting issue. What kind of images are these? Are they the default images installed or are they your custom set of images?The images are png files included as they were icons into the table.
>
You say the images disappear when you sort the report. Does it happen when you sort on demand in the dashboard or when you sort it in the report itself? Or both?Only when sort from the dashboard. From the report itself, the answers works fine.
>
What are your environment details?Server:
OBI 10.1.3.4.1.090414.1900
Windows 2003 server
JDK 1.6.0.17
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>
Thanks for the extra info.
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How to Suppress Report Total When Using Sum on Columns & Break Formatting

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Hi, and welcome!
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Hello to APEX forum
My Apex version is 4.2.1,
database version is Oracle 10g XE on Windows 7 Pro
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Hi Mark,
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My Blog: http://www.inside-oracle-apex.com
APEX Plug-Ins: http://apex.oracle.com/plugins
Twitter: http://www.twitter.com/patrickwolf

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RE: SQL Server - 2008 R2 Reporting Services
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https://social.technet.microsoft.com/Forums/en-US/56650bf4-e65d-4f84-8ac0-a57cb26543b2/image-disappears-when-sorting-in-ssrs-for-server-report-on-report-vieweron-aspx-page?forum=sqlreportingservices
If you have any more questions, please feel free to ask.
Thanks,
Wendy Fu
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Reports serialising when column sort attributes used

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