Explanation / use of read-only zoning feaure on MDS products

Does anyone know if the MDS product line will work in this way when licensed with the Enterprise option for the read-only zoning?
I am trying to come up with a solution to provide real-time access to database files for a 2nd server that facilitates reporting applications. If I have LUNs that contain my primary database data and log volumes mapped to one server and create a 2nd read-only zone containing those LUNs, can I map those LUNs to a 2nd server as a kind of virtual/snapshot type instance?
I know that this will throw some odd things at the application side as it may or may not recognize the LUNs at read-only and could store things in temp tables or memory that would be cached and not actual current data but we've dealt with that in our reporting applications in the past utilizing snapshot technology on our storage platform. The downside to using that is in updating the snapshot to more recent copies, you have to at least offline the database to create a new snapshot with the same name/location which introduces interruptions, timeouts, etc.
Any feedback on how the read-only zoning feature is supposed to perform this type of functionality and/or real-world examples of how you are using it would be appreciated.
Thank you,
Justin Loucks

I guess I'm not sure how to read some of this when it references different versions of SAN-OS code and Operating system levels. For instance, in the documenation for SAN-OS 3.0, I found the following:
Read-only volumes are not supported by some operating system and file system combinations (for example, Windows NT or Windows 2000 and NTFS file system). Volumes within read-only zones are not available to such hosts. However, if these hosts are already booted when the read-only zones are activated, then read-only volumes are available to those hosts.
From -- http://www.cisco.com/en/US/products/ps5989/products_configuration_guide_chapter09186a0080662d35.html#wp1136509
Does this mean that as long as it is not my OS boot volume it may work? Also, it references NT and 2000 but not Windows 2003. Perhaps that is something that works differently now. I guess I'll open a case with MS on that to see what they say.
If anyone has already tried this or knows differently, please let me know. I just want to make sure I've exhausted all options here before I resort to Log shipping or some other software based solution.

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What is the idea of a read only forum about a new product ?

My problem is that lightroom 5 crashes when my sony xperia is connected. this worked in the beta. Searching the web and the adobe page i always land in discussion threads that are read only
Q: what is the idea of a read only forum about a new product?

The Lightroom forum is not read-only (evident as you've just posted a question).
The Beta forums in Adobe Labs are locked because the beta program is now closed. If you arrive in the beta forum because of a Web search, you can't reply to the thread but the homepage (and the Lightroom product page) links you to the correct place.

AP Banks menu is excluded and used Bank read only but Accounts is greyed ou

Hi,
We have a audit requirement to restrict a responsibility from Banks acess. So removed the Bank Setup Menu and created a Banks Read Only fucntion and assigned it to the responsibility
Now I can see Banks as read only but the Bank Account button is greyed out.
Please let me know if we can make it to work
Thanks,
User 12048986

I had to include all the Bank functions in the menu and then also include the read only bank accounts. Now we can exclude the bank fucntions from responsibility

Read only text Items uses the maximum width

Folks,
I have a form with 3 regions and each region has 6 or more text items each with a different width (40, 30 24, 2...). I am using a Read Only Condition Type on all these items to disable them. I am setting the background color as bgcolor="#DCDCDC" in the Read Only Element Table Cell Attributes.
All my elements are disabled (Gray color) but with the maximum width of 40 bytes. I don't want a 2 byte text item 40 bytes long and grayed out. How can I set a specific width for individual items in Read only Condition? Please help
Thanks
Raje.

Try this alternative by disabling the HTML Form Item at the required process point.
I added this JavaScript to the HTML Header of the page which will allow me to disable the required item, plus set its background and color:-
<script language="JavaScript1.1" type="text/javascript">
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</script>In the Region Footer of the Region where my items are located I added this JavaScript code:-
<script language="JavaScript" type="text/javascript">
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   ** by on-insert db trigger and sequence.)
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</script> The resulting page is a lot better looking than using the APEX read only text item.
Regards,
Phil

Read Only Display of Radio group and Text area with counter not working

Hello,
I am using Apex 3.2, with 10g for the database
I have this form, with fields that will set to read only when status = 'closed'
All of the fields display as read only except for 2. I cannot figure out why this is not working correctly.
1st field is Issues that is a text area with character counter, with a sql query behind it, that is set to null unless the query is pulling in the data.
2nd field is Status which is a radio group that will not display as read only when status = 'closed'
I have other fields on the form with the same format and they change to read only when the status = 'closed', I have even copied the pl/sql expression from one field to these fields and it still doesn't work correctly. I have also tried javascript for an on load event, which works, but once I click on the save button, it disables all of the page items, which works correctly, but I purposely forget to enter information, to make sure the validations are firing correctly, which it does, but the script disables everything, not allowing me to correct the errors. The javascript is firing on the on page load event.
Any help on this is greatly appreciated.
Mary

Dung,
That API seems to have a bug, it returns true/false/null, so you could use 'return not nvl(htmldb_util.current_user_in_group(p_group_name => 'APP Admin'),false)' to get a false value.
Unfortunately there's another problem: using the read-only attributes for checkbox or radiogroup item makes them hidden. My suggestion would be to create another item that has disabled="disabled" in the HTML Form Element attribute in the item definition and display that item or the non-disabled item alternately, using conditions based on the current_user_in_group logic.
Scott

Are 'read only' items causing my automatic row processing to fail?

I have a form that uses automatic row processing to update my table.
I recently had to add a check to lock down the fields using the read only condition where a record has been 'approved'. So, I turned off all of the fields and hid the update button.
Now they want me to check to see if the user is a manager, and if so, allow them to see the update button, and make a single field on the form modifiable.
I have the user identified as a manager, and can make the field accept the change (a yes/no combo box). Yet when they click the update button, the form just sits there. A branch is supposed to fire on hitting that button, taking them back to the previous report, but it doesn't happen. The source of the combo box in question uses a column on the table, and works fine when the form has all of the fields showing for modification.
I had some validations that I finally set to never fire, thinking that they were failing and just not giving the error messages. I know a bad sql or pl/sql atatement in a validation will cause the form to just keep sitting there doing nothing, and thought it might help.
Several of the various fields are combo boxes, several are text boxes.
I'm stumped.
Shall I keep the regular update button hidden whether it is a manager or not (because it has been 'approved'), and enable a new button that fires off a process to update the one field that the manager may want to change? Does making a field 'read only' always have a detrimental effect on the auto processes I've been counting on? Is that if fact what is happening now?
Thanks in advance for any advice or comments on this.
Clayton

Hi, Scott.
My version is 3.0.0.00.20
I have received info to set up the application, though I have not activated it as yet. I'm reluctant to try to load up the various tables to make it work. It could be done.
My workaround is to that the user (a manager) fires off to another form to show an individual record, and ask if he/she really wants to make this change. On submit, they will be taken back to the original locked down form, and I will update the single field in that process of returning them. This will actually be a plus, in that I expect to show them all of the 'duplicate' entries for that item, and show them that by 'activating' this particular item, they will 'deactivate' the one duplicate that is currently active. Or, if they are deactivating the sole item that is active, that there will in fact be no active items in the system. Convoluted as heck, but they swear this is how they've been doing business with their briefcases and file cabinets of Excel files. I'm surprise they even float at this point (these are ships we're talking about).
This all may be due to the form originally having a next/previous/count process once arrived at my clicking on the edit button of the report of items. All of that has been hidden away, and though the fields exist of the form, they are not used. They only see the current item that they clicked on from the report.
I read up a little on session state, as well as posts with the debug error I was getting. I'm still not on board with the whole issue of 'state'. Items stay as they are until they're changed, no? I suppose that sounds simplistic.
One of the things that caught my eye was several combo box lists that on read only mode, showed [] square brackets. Which, in some cases is okay.
What I'll try to do is set up a public application - for future use if nothing else. I'm going to be working on this for awhile. I have more than a bit of work to do to cleanse the data as well as get rid of the single sign on requirement (I'll assume that I should have to do this) in order to share the app.
I know you're expecting me to have this up and running for you to look at, but I'm under the gun. And they actually like my workaround.
I'll keep everybody informed, one way or another.
Clayton

How to get the value of a parameter/field in a ADF Read-Only Form

Hi,
My requirement is as follows. Could anyone shed some light on this issue.
I am showing the records from db table using ADF Read-Only Form ( which uses ViewObject created for the table). Now I want to capture(get) the value of a field in this form and then have to invoke an action based on the value in this field. I mean to say the next page depends the value of a field in this form.
Please suggest how can I achieve this functionality?
Thanks in advance.
~Sivaji

That's indeed what Sivaji needs.
In the page definition you can add a value to the parameters of a certain method. Like RJundi mentioned, point to the attribute of the current row.
Example:
The value of the read only textfield will be something like this:
#{bindings.EmployeeName.inputValue}points to an attribute value in the pageDef of the page:
    <attributeValues id="EmployeeName" IterBinding="AllEmployees">
      <AttrNames>
        <Item Value="EmployeeName"/>
      </AttrNames>
    </attributeValues>The attribute value has also an iterator binding defined in the page def:
    <iterator id="AllEmployees" RangeSize="10"
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Hope it helps,
Koen Verhulst

Limitations of read-only JE Environments

Hello all,
I realized recently that our documentation on the limitations of read-only Environments is lacking. So for the next JE release I updated the javadoc for EnvironmentConfig.setReadOnly. The new text is pasted below. If you're using, or thinking of using, a read-only environment, be sure to take a look. I apologize for the lack of documentation in the current release, especially if you've used a read-only environment without understanding these limitations and this has caused problems for you.
--mark
setReadOnly
public EnvironmentConfig setReadOnly(boolean readOnly)
Configures the database environment to be read-only, and any attempt to modify a database will fail.
A read-only environment has several limitations and is recommended only in special circumstances. Note that there is no performance advantage to opening an environment read-only.
The primary reason for opening an environment read-only is to open a single environment in multiple JVM processes. Only one JVM process at a time may open the environment read-write. See EnvironmentLockedException.
When the environment is open read-only, the following limitations apply.
. In the read-only environment no writes may be performed, as expected, and databases must be opened read-only using DatabaseConfig.setReadOnly(boolean).
. The read-only environment receives a snapshot of the data that is effectively frozen at the time the environment is opened. If the application has the environment open read-write in another JVM process and modifies the environment's databases in any way, the read-only version of the data will not be updated until the read-only JVM process closes and reopens the environment (and by extension all databases in that environment).
. If the read-only environment is opened while the environment is in use by another JVM process in read-write mode, opening the environment read-only (recovery) is likely to take longer than it does after a clean shutdown. This is due to the fact that the read-write JVM process is writing and checkpoints are occurring that are not coordinated with the read-only JVM process. The effect is similar to opening an environment after a crash.
. In a read-only environment, the JE cache will contain information that cannot be evicted because it was reconstructed by recovery and cannot be flushed to disk. This means that the read-only environment may not be suitable for operations that use large amounts of memory, and poor performance may result if this is attempted.
. In a read-write environment, the log cleaner will be prohibited from deleting log files for as long as the environment is open read-only in another JVM process. This may cause disk usage to rise, and for this reason it is not recommended that an environment is kept open read-only in this manner for long periods.
For these reasons, it is recommended that a read-only environment be used only for short periods and for operations that are not performance critical or memory intensive. With few exceptions, all application functions that require access to a JE environment should be built into a single application so that they can be performed in the JVM process where the environment is open read-write.
In most applications, opening an environment read-only can and should be avoided.
-----

You've asked an interesting question! I'm afraid that the answer is that it's not possible in BDB JE today.
What you'd really like for your second case is part of the type of functionality provided by MVCC (Multi-Version Concurrency Control). In case you're not familiar with that term, MVCC is the database feature which guarantees that all reads made in a transaction will see a consistent snapshot of the database and that the transaction will successfully commit only if no updates it has made conflict with any concurrent updates made since that snapshot. Unfortunately, while our sister product, BDB (C) has that feature, we do not yet support it.
I think your alternatives are to do achieve your point in time snapshot from the file copy based backup, from the second process, or from an application level mechanism that locks out other updates.
Regards,
Linda

Read Only TextAreas with Carriage Return, Line Breaks and Word Wrapping

Hi all,
I know there are a few posts around this subject but I cannot find the answer to the exact problem I have.
I have a page that has a 'TextArea with Character Counter' (4000 Chars) that is conditionally read only based on the users credentials (using the 'Read Only' attributes of the TextArea item).
When the field is editable (not Read Only) everything works fine but when I make the field Read Only I start to have problems:
The first problem is that the Carriage Return and Line Breaks are ignored and the text becomes one continuos block. I have managed to fix this by adding pre and post element text of pre and /pre tags. This has made the Carriage Return and Line Breaks word nicely and dispaly correctly.
However, it has introduced a second problem. Long lines, with no Carriage Returns or Line Breaks, now extend to the far right of the page with no word wrapping, making my page potentially 4000+ characters wide.
How can I get the field to be display only, with recognised Carriage Returns and Line Breaks, and Word Wrapping inside a fixed width of, say, 150 characters?
Many thanks,
Martin

Hi,
Just a cut and paste of yours with the field name changed:
htp.p('<script>');
htp.p('$x("P3_COMMENTS").readonly=true;');
htp.p('</script>');I also have the following in the page HTML Header, could they be conflicting?
<script type="text/javascript" language="JavaScript">
function setReleaseToProd(wpTypeCode){
//setReleaseToProd($v(this))
var get = new htmldb_Get(null,$v('pFlowId'),'APPLICATION_PROCESS=set_release_to_prod',0);
get.addParam('x01',wpTypeCode);
gReturn = get.get();
if(gReturn) {
$s('P3_RELEASE_TO_PROD',gReturn);
get = null;
</script>I am a long way from knowing much about Javascript (this page code was written by someone else) so all help is much appreciated.
Martin

Read Only Display Settings Help

Hello,
I am trying to control what some users can see in a page. Right now I have an item field (Roles) display as checkbox. Roles is a field in my table that I created with RolesA, RolesB, RolesC. Note: these are not htmldb roles.
In my Edit Page Item --> Read Only Display Settings --> Read Only Condition Type --> PL/SQL Function Body Returning a Boolean. Under Expression 1, I coded:
return not htmldb_util.current_user_in_group(p_group_name => 'APP Admin')
I want this item to read-only unless the user happens to be a member of group 'APP Admin'.
The expression is not working. It seems that no matter what user is logged in they can modify this item. Is there another way I can do this for controlling what my RolesA, RolesB, and RolesC can modify? BTW, this item is a checkbox.

Dung,
That API seems to have a bug, it returns true/false/null, so you could use 'return not nvl(htmldb_util.current_user_in_group(p_group_name => 'APP Admin'),false)' to get a false value.
Unfortunately there's another problem: using the read-only attributes for checkbox or radiogroup item makes them hidden. My suggestion would be to create another item that has disabled="disabled" in the HTML Form Element attribute in the item definition and display that item or the non-disabled item alternately, using conditions based on the current_user_in_group logic.
Scott

Read Only Element Table Attributes not working since we migrate 3.0.1

Dear all,
I have a page to dispaly the content of a journalling table and highlight the changes in red.
To do it, the guy before me use the read only.
In the read only condition type he put pl/sql expression.
the expression is :P120_OLD_DEADLINE_DT NOT LIKE :P120_NEW_DEADLINE_DT
And in Read Only Element Table Cell(s) Attributes the code is bgcolor="#FF0000"
In 2.2 the background was red and in now the the background doesn't work.
Do you have an idea why in 3.0.1 it doesn't work.
Thanks
Eric

Scott,
The background works only with the read only condition always.
In my new item the select is select 10 from dual.
In the read only condition I select Value of item in expression 1 is not null.
I put in expression 1 the name of my item :p997_test.
The read only doesn't work.
In your test, did you select the condition always or you chose something else ?
Thanks
Eric

Radio Group read-only bug?

I appologize if this has already been posted - I couldn't find it in a search.
It seems that when a radio group is set to read-only, the input elements have an empty name attribute. This causes all but the last radio group to have no checked value.
Is this a known bug? or do I have something set up wrong? If it is a bug, is there a workaround?
Thanks,
Eric

Eric - Didn't know about this. Thanks. Maybe don't use the read-only option and achieve a similar effect with your own attribues on the html.
Scott

Problem with Read Only Display settings

Hi Guys,
When you use the "Read only display setting" for a field (bgcolor="#FF0000") it actually makes the whole cell red. The cell is longer then the field. Is there a way to just adjust the color of the display-only field. Firefox displays the read-only fields with the grey background (good). IE displays them as a normal text field (stupid).

Sorry, found it. You set it in HTML Form Element Attributes.
Would it not be better to have an option in the "Read Only Display setting" to set the HTML Form element aswell or instead of the cell?

Read only table in jdeveloper11

I use a read only af:table in my page..
1-as the page loads for first time , I want to navigate between rows as using up/down arrow keys. How can I focus on the first row to navigate...
2- if I can make partial trigger script , I think I will be able to click the first row of this read only table. Do you have any sample about this click event to the first row of a table?
3- Or initial focusid of document I want to use to focus on first row but I can't know the id of the fisrt row as I give it an id... How can I reach at this row or column?
do you have an idea ?

Hi,
did you make the table selectable ? as the page loads for first time , I want to navigate between rows as using up/down arrow keys doesn't make much sense to me. assume you want o put focus on the component, is this what you want?
Frank

Read only af:table first row select and focus on form load

I use a read only af:table in my page. When my page loads and I click on my table, then I can use up / down arrow keys to navigate in my table's rows. But if I don't click on the table, I can't navigate in my table's rpws.
What can do in my page to give the first focus to my table's first row and navigate in my rows without using mouse clicks....
findElementById function in javascript does not work in jdeveloper 11...
Do you help me for this?
Thanks..

Hi,
actually findElementById does work, but you should use the ADF client side framework for this. Add a clientListener to the component that intercepts the keyboard usage and make it callin the next record on the table.
I'll take a note for a how-to to put on my blog as I don't have the code ready. However, its possible this way
Frank

Explanation / use of read-only zoning feaure on MDS products

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