Need details about ECC upgrade
Hi Gurus,
Greetings..
Need help on ECC upgrade
We are currently on 4.0B system and upgrading to ECC 6.0
Need details on the following
1.) Can we directly upgrade from 4.0 to 6.0
2.) What will be the system details ( like database os etc)
Thanks in Advance
Gopi
Hi Gopi,
according to SAP Product Availability Matrix you can upgrade directly from 4.0B system. Please check the link below:
https://service.sap.com/sap/support/pam?hash=pvnr%3D01200615320900001296%26pt%3Dg%257Cr
Please activate the check marks on the left side (pressing below link) to get an overview about supported OS/DB combination:
https://service.sap.com/sap/support/pam?hash=pvnr%3D01200615320900001296%26pt%3Dt%257CPLTFRM%26ainstnr%3D012006153249000…
Cheers,
Andreas
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Hi,
I'm experimenting with the JRockit JRA tool: I think this is a very useful tool ! It provides very valuable information.
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Nevertheless, the BEA categories (thin/fat, uncontended/contended, recursive, after sleep) are not so clear. A short paper explaining what they mean would greatly help.
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Thanks,
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"ihse" <[email protected]> wrote in message
news:18555807.1105611467160.JavaMail.root@jserv5...
About thin, fat, recursive and contended locks in JRockit:
Let's start with the easiest part: recursive locks. A recursive lock
occurs in the following scenario:synchronized(foo) { // first time thread takes lock
synchronized(foo) { // this time, the lock is taken recursively
}The recursive lock taking may also occur in a method call several levels
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separate method.
The good news is that recursive lock taking in JRockit is extremely fast.
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regardless if the lock was originally taken as a thin or a fat lock
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Now let's talk a bit about contention. Contention occurs whenever a thread
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by another thread). Let me be clear: contention ALWAYS costs in terms of
performance. The exact cost depends on many factors. I'll get to some more
details on the costs later on.
So if performance is an issue, you should strive to avoid contention.
Unfortunately, in many cases it is not possible to avoid contention -- if
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better than others, though. Be careful that you don't overuse
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very fast.
For locks that are mostly uncontended, thin locks are great. There is
little overhead compared to no locking, which is good since a lot of Java
code (especially in the class library) use lot of synchronization.
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short moment of time, and JRockit is running on a multi-CPU (SMP) machine,
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user code is running, and the CPU is "wasting" time that could have been
spent on other threads. Still, if the lock is released by the other
threads after just a few cycles in the spin loop, this method is
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contention would lead to bad performance. In that case, the lock is
"inflated" to a "fat lock". A fat lock has the following characteristics:
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threads wanting to acquire the lock.
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* One (or more) threads can register as queueing for (blocking on) that
lock.
A thread that encounters contention on a fat lock register itself as
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its time quantum given to it by the OS. While this means that the CPU will
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switch is still expensive, compared to spin locking. When a thread does
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a fat lock). If JRockit believes that the lock would benefit from being
thin (basically, if the contention was pure "bad luck" and the lock
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* If and when to deflate a fat lock back to a thin lock.
* If and when to skip on the fairness on a contended fat lock to improve
performance.
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