System.properties (what is the scope in memory)

Does each JVM have it's own System properties? Hence calls from one JVM System.getProperty() or System.setProperty() should be within each individual JVM? Also I need to know this so that I can gurantee that using the System properties for private information won't be accessed by anyone else on the system... Any input?

System properties are unique for each VM, they are therefore visible to all code running in the VM.
This seems like a good thing to use for storing things like passwords because of the global visibility however using the System properties for storing such things has to be considered as being insecure.
System properties should be regarded as a place to read data from that is relevant for either the Java runtime environment or for setting component specific properties, XML Parsers make use of this for example. Using System properties as an in memory database is neither secure nor sensible. Careless selection of keys for the properties you wish to store can have unexpected results if you accidentally overwrite a property that is used for other purposes.
I would use a separate Properties instance that has nothing to do with the System properties and I would also recommend the encryption of sensitive data like passwords.

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What is ESOA? What is the Scope/Role for Functional Consultants in eSOA.

Hi Experts,
1)     Does eSOA is a tool, application or module?
2)     What is the relation between eSOA and ECC6.0?
3)     What is the Scope/Role for Functional Consultants in eSOA?
4)     What I have to learn in eSOA?
5)     How it is useful for Functional Consultant?
6)     How it is useful for Customers?
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Hi Ram,
See the answers below
> 1)     Does eSOA is a tool, application or module?
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> 2)     What is the relation between eSOA and ECC6.0?
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> 3)     What is the Scope/Role for Functional Consultants in eSOA?
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> 4)     What I have to learn in eSOA?
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> 5)     How it is useful for Functional Consultant?
see above
> 6)     How it is useful for Customers?
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What triggers the prompt for memory test during boot up of WLC.

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I have listed the java system properties both standalone and in the Oracle database. The standard list of system properties is quite extensive and informative. But the list of system properties from the Oracle database is severely truncated.
I expect these properties are initialized on database startup.
If that is the case, I expect there to be a file and initialization parameters that define where the information is kept and there values.
Can anyone give me some guidance?

System*.properties file should be located in the $ORACLE_HOME/javavm/jahome directory
I have listed the java system properties both standalone and in the Oracle database. The standard list of system properties is quite extensive and informative. But the list of system properties from the Oracle database is severely truncated.
I expect these properties are initialized on database startup.
If that is the case, I expect there to be a file and initialization parameters that define where the information is kept and there values.
Can anyone give me some guidance?

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16GB RAM upgrade + an SSD upgrade (biggest wallet can afford).
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What are the largest sized memory cards that can be swapped into a macmini 2.6GHz i7 quadcore

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What is the largest flash memory for newton mp2000?

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just wondering what the largets flash memory for the Newton is?
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cheers
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What is the scope of implicit loop variables?

Hi,
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There's a complete code snippet below.
In line no.9, there's the first time use of implicit loop variable 'task_inst'.
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Hint
I heard (from little sparrows), that local variable scoping is not possible because of underlying
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but used in different scopes. Think about the unintended side effects.
import ABSL;
import AP.ProjectManagement.Global;
var query_tasks;
var query_tasks_param;
var query_tasks_result;
foreach (empl_inst in this.Employees) {
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// ===========================================================================
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Kind regards,
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Hi,
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http://www.msi.com/product/mb/880GM-E43.html
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Code: [Select]
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Max Memory (GB) 32
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Please advise.
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Jim

Quote from: Bas on 02-January-12, 23:48:42
It's only limited to what the CPU can handle, and that is far more then you can buy at this time
However, MSI only tested at the time of production of the board.
So if you use bigger modules you have to test yourself if it works with your CPU, the board got nothing to do with it.
What ever you do, don't mix sizes and brands, often goes wrong.
Bas,
Not doubting what you said, but I hope that's the case. Will post back as soon as it gets in and I get a chance to test it. As you suggested, I'll initially remove the 4x4GB sticks, and replace them with the new 2x8GB sticks, and see how that works. If it that works, I'll put in the additional 2x4GB (understood what you said, but this is interim).
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What are the Scope Fields for in PageContext??

There are 4 fields in javax.servlet.jsp.PageContext, what is there functionality and purpose?

The page context is a facade pattern for all the namespaces associated with a JSP page - page, request, application, session. It unifies access to these objects (so you don't have to query all 4 to find what you're looking for). The attribute scope fields are used to indicate which namespace a particular attribute is associated with (and implicity, what the lifespan of that attribute is).

Azerty keyboard but english system language: what is the shortcut for forwards??

Hello,
I had to buy a new computer and since I live in France, I bought a second hand, but almost new one, with a french keyboard. Apple assured it was possible to set english as the main system language and use a french keyboard.
But when I'm in Safari and I want to go forward, I can't do it like I used to, because there is no "hook"-key on the french keyboard!
What to do now, if I want to use a keyboard shortcut instead of the mouse and menu?
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margarix wrote:
it works with shift, alt, cmd, ( all at the same time!
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What determines the client connection memory size?

We are trying to scale up the number of connections on our db - (dedicated not shared) .. but quickly consume the box.
Its 11gr1 - Linux .. 500G of memory ..
The "only" parameter we have set is:
*.memory_target=216522555392 (~200G)
Processes set to 6000 - but are are only around 1800 at this point.
We are seeing (via top) client connections with a reserved memory of 25-30g (usually the dbwr type processes) and client connections showing 5-10G in size.
With clients taking this much memory, we start to see swapping on the box. In our dev/qa environment the clients are in the MB range .. of course they are not seeing real world traffic so I presume that memory requirements are growing as the app runs.
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Thanks for any tips..
If we get one db bounce this year .. we want to be right .. cant guess here..
Daryl

DarylE. wrote:
We are trying to scale up the number of connections on our db - (dedicated not shared) .. but quickly consume the box.
Its 11gr1 - Linux .. 500G of memory ..
The "only" parameter we have set is:
*.memory_target=216522555392 (~200G)
Processes set to 6000 - but are are only around 1800 at this point.
We are seeing (via top) client connections with a reserved memory of 25-30g (usually the dbwr type processes) and client connections showing 5-10G in size.
With clients taking this much memory, we start to see swapping on the box. In our dev/qa environment the clients are in the MB range .. of course they are not seeing real world traffic so I presume that memory requirements are growing as the app runs.
Can we set something to reduce the footprint of the client connections?
Thanks for any tips..
If we get one db bounce this year .. we want to be right .. cant guess here..
Daryl
>Can we set something to reduce the footprint of the client connections?
no
Since *NIX maps SGA into every client's process, displayed RAM size is distorted.
If you simply SUM every reported client size, it will greatly exceed total RAM (in most cases)
The fact that any swap is used is in itself not a negative indicator.
run vmstat like below
all is OK when (si + so) is less than (bi + bo)
[oracle@localhost dbs]$ vmstat 10 6
procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------
r b   swpd   free   buff     cache     si   so    bi    bo   in   cs us sy id wa st
0 0     32 82684 20384 557096    0    0   120    32 1008 1057 3 7 88 1 0
0 0     32 82560 20408 557124    0    0     0    20 1031 1225 2 4 93 0 0
0 0     32 82560 20432 557116    0    0     0    16 1002 1183 2 6 92 0 0
0 0     32 79212 20456 557144    0    0     0    74 1007 1185 4 12 84 0 0
0 0     32 78592 20480 557148    0    0     0    21 999 998 2 5 92 0 0
0 0     32 78592 20504 557140    0    0     0    20 1002 929 2 7 91 0 0
[oracle@localhost dbs]$

System pref- what do the display numbers mean &other questions

1. are they the choices that the mini (purchased 9/07) can "send to the display" or are they the monitor's only display choices built into the monitor (like 1024x 768)
2. whats the advantage if any of a widescreen LCD display
3. will any "cheap- ie $200-300 LCD viewsonic. samsung, HP monitor work with my new mini if the monitor has a dvi or vga plug?
Its now running my old proview CRT I paid like $129 for .
4. does the mini have a set / preferred resolution range, again like the 1024 x 768
Thank you

Great questions edwardh1. I'll tell you what I think are the answers.
1) The mini does contain several pre-installed resolutions, so it is aware of several "standard" resolutions without any reliance on a display driver. However, whether or not the mini makes some or all of these resolutions available to the attached display will depend on how the mini "detects" the display.
2) Widescreen is much better for modern digital media. For example, DVD playback on a widescreen is much nicer than on a conventional screen. It's also nice to have a little extra width when using certain programs that have tool palettes. You can stick the palettes off to the side where they don't interfere with your work area. And if you go really big, like a 24" monitor, you can put two pages side-by-side, which can result in a real boost in efficiency with certain tasks.
3) As to whether any monitor will work with a mini, in theory the answer is yes. But if you hang out on these discussion boards long enough you will see that the road is full of potholes. Apple, as has been the case for a number of years, is always on the leading edge of new technologies, with Windows in a trailing position. If you want examples, think of USB, FIrewire, Bluetooth, DVI...the list goes on and on. Macs use a modern plug-and-play architecture for delivering the display driver to the host (Mac). Windows can perform this trick, but they also have a legacy system where the user installs the display driver (usually from a CD ROM) or else a wizard installs the driver from the internet. The problem with old habits on Windows is that they die hard. So even though modern displays for the most part correctly implement plug-and-play drivers, which in theory Windows does support, there are plenty of cases where the display manufacturers blow it and fail to do a good job of it. Instead they ship the Windows driver on a CD and call it a day. So you can be 90+% confident of a good result when buying a non-Apple monitor, but by no means is it guaranteed.
4) This question is very similar to your first question. Yes, the mini will have pre-installed several standard timings. I am sure 1024 x 768 would be on that list.
My final comment would be don't worry too much about buying a third-party display. Go for what you want with the confidence it will most likely work just fine.

System.properties (what is the scope in memory)

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