Using DBMS_LOCK to serialize the execution of packages

Hi everybody,
I'm having an issue with a new process that I'm working on and would love to get some feedback from the Oracle community on the best way to approach this.
I am going to be receiving hundreds of flat files on a nightly basis that need to be processed each day. I've got a listener running on a server which will detect that a new file has been moved to a particular directory and then begin to load it into a raw tables in an 11g database. As each file finishes loading, a PL SQL package will kick off to begin creating summary tables and to do some additional transformations. However, if this package runs simulatenously for two different files then I get an ORA-00054 error because some of the transient tables that get truncated during this process conflict with one another. I'm also concerned that if this package runs too many times concurrently that it'll deadlock.
I've been doing a lot of reading on this over the last few days, and it seems like the best approach is to use a named lock through Oracle's DBMS_LOCK package in order to throttle the execution of my packages and serialize them so that one will run only after the previous one completes. Has anybody attempted to do something like this? If so, would you mind posting some sample code so that I can implement this in the best way possible? If anyone has any other suggestions I'm open to hearing those as well. It seems like in theory the job scheduler would work for this as well, except that we've got other processes which run through that and I don't want to screw any of those up by changing the parameter to allow for concurrent jobs to run. This could end up doing more damage than good.
Thanks in advance for your help.

You certainly could use DBMS_LOCK to serialize access.
At first blush, however, I would tend to question why there are transient tables that would conflict between different sessions. If you have transient tables, I would tend to expect that you would want to use global temporary tables, which eliminates the need for you to truncate them and separates data inserted by various sessions. If that's the only reason you want to serialize access, I would tend to advocate building the tables as real temporary tables and letting multiple processes run simultaneously.
If there are other reasons that serial processing is desirable, my next thought would be to see if the listener could be made to handle the serialization. If there is just one listener process and that process waits until one file is fully processed before looking for the next file, that would seem like the cleanest way to enforce serialization.
If you end up really wanting to use DBMS_LOCK, here is an [example of using named locks|http://www.adp-gmbh.ch/ora/plsql/sync_sessions.html]. The amount of code required is pretty minimal, particularly if they're all going to ask for an exclusive lock.
Justin

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Windows malware can't harm you directly (unless, of course, you use Windows.) Just don't pass it on to anyone else. A malicious attachment in email is usually easy to recognize by the name alone. An actual example:
London Terror Moovie.avi [124 spaces] Checked By Norton Antivirus.exe
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The ClamXav developer won't try to "upsell" you to a paid version of the product. Other developers may do that. Don't be upsold. For one thing, you should not pay to protect Windows users from the consequences of their choice of computing platform. For another, a paid upgrade from a free app will probably have all the disadvantages mentioned in section 7.
9. It seems to be a common belief that the built-in Application Firewall acts as a barrier to infection, or prevents malware from functioning. It does neither. It blocks inbound connections to certain network services you're running, such as file sharing. It's disabled by default and you should leave it that way if you're behind a router on a private home or office network. Activate it only when you're on an untrusted network, for instance a public Wi-Fi hotspot, where you don't want to provide services. Disable any services you don't use in the Sharing preference pane. All are disabled by default.
10. As a Mac user, you don't have to live in fear that your computer may be infected every time you install software, read email, or visit a web page. But neither can you assume that you will always be safe from exploitation, no matter what you do. Navigating the Internet is like walking the streets of a big city. It can be as safe or as dangerous as you choose to make it. The greatest harm done by security software is precisely its selling point: it makes people feel safe. They may then feel safe enough to take risks from which the software doesn't protect them. Nothing can lessen the need for safe computing practices.

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Hi LizAuchincloss,
Please install Acrobat from the Exception folder using exception deployer command line:
The following command is used to deploy Acrobat for Windows. (You will recollect that Acrobat for Windows should be deployed before deploying the main package.) The --mode=pre option specifies that Exceptions Deployer Application is run before deploying the main package. The installLanguage is specified as en_US (US English)—this option is also mandatory while deploying Acrobat for Windows.
ExceptionDeployer --workflow=install --mode=pre --installLangauge=en_US
Please refer the mentioned kb: http://helpx.adobe.com/creative-cloud/packager/using-exceptions-deployer.html .
Regards,
Romit Sinha

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