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| knightman |
 Posted: Thu Jun 24, 2004 10:29 am Post subject: UUID |
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Newbie
Joined: 24 Jun 2004
Posts: 1
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hey folks,
How unique exactly is the UUIDASCHAR?the documentation states its a "miscellaneous function".Does this translate to a random id generator or is it a function that makes use of some data like a timestamp and so on to generate the number??  |
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| kirani |
| Posted: Thu Jun 24, 2004 10:52 am Post subject: |
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Jedi Knight
Joined: 05 Sep 2001
Posts: 3779
Location: Torrance, CA, USA
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Well, UUID is always unique, so these functions will always generate a unique identifier.
_________________
Kiran
IBM Cert. Solution Designer & System Administrator - WBIMB V5
IBM Cert. Solutions Expert - WMQI
IBM Cert. Specialist - WMQI, MQSeries
IBM Cert. Developer - MQSeries
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| fazz |
| Posted: Tue Jun 29, 2004 9:49 am Post subject: |
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Centurion
Joined: 20 Feb 2004
Posts: 144
Location: England
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| UUID stands for 'Universally Unqiue Identifier', so its universally unique !! |
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| mq_guru |
| Posted: Tue Jun 29, 2004 10:32 am Post subject: |
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Novice
Joined: 23 Feb 2004
Posts: 13
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I think, this UUID is created based on your local system/network parameters and otherthings like timestamp etc. So, its unique across the usage.
-vivek |
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| muralihegde |
| Posted: Wed Jun 30, 2004 1:06 am Post subject: |
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Centurion
Joined: 30 Apr 2002
Posts: 108
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Yes Thats correct.
And we have an interesting problem as well. I beleive the broker uses the hostname as part of this UUID.
Our broker runs on mainframe. OS/390. WMQI V2.1
Sometimes after the IPL (reboot of OS) of the LPAR, the broker starts throwing an exception unable to create UUID.
We found out that exactly at this time, if we use a test java program to which tries to get the Host Name from the system using
java.net.InetAddress.getLocalHost().getHostName())
we get an exception !
However the unix command hostname on the command prompt on the omvs returns the hostname.
The /etc/hosts file always has the entry for the hostname
The solution to this is recycle the tcp ip subsystem !
And this solves both the problem, the broker does not throw any exception and the test java pgm also returns the hostname.
The question ?
Why is tcp ip recycling is needed?
Why the broker does not recognise the value from /etc/hosts?
Any thoughts on this will be greatly helpful to us..
-Murali |
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