Oracle Database Discussions

Announcement

For appeals, questions and feedback about Oracle Forums, please email oracle-forums-moderators_us@oracle.com. Technical questions should be asked in the appropriate category. Thank you!

NOLOGGING tables and recovery of database (and standby)

rahulrasDec 13 2010 — edited Dec 15 2010

Hi All,

I am a developer and has not done a recovery of a crashed production database. So, I would like to learn from other people's "practicle" experience.

It is not a big deal now a days about creating a NOLOGGING table and doing direct path load of data in it. What is the implication of this if we have to recover a database from disk failure (i.e. using backup and archived logs) ?

I know, I can read documentation, which will describe the theory (which I know).

But what exactly will happen when a DBA is recovering a crashed database which had few NOLOGGING tables and data loaded in these tables with nologging ?
Will the database be restored without any problems, just giving few messages / warnings about these nologging tables?
or the DBA will have to do some tedious work to restore that database?

Also, if we have a standby database maintained by transporting archived logs, what will be the case if the main (is it called primary) database has (media) crashed and we have to shift on the standby?
Let us say, I have all the files which were loaded (in nologging mode) on the primary database. So, getting the data loaded is not a problem. My question is, because of the NOLOGGING tables? will we have substantial difficulties getting the standby database to work?

Consider Oracle v10.1 and onwards for my question.

Thanks in advance.

CJ Bell

This example may be useful (cheers Denes Kubicek!) , its about sorting on a hidden column when the user executes a sort on a different column

http://htmldb.oracle.com/pls/otn/f?p=31517:153:3037400840650629::NO

you could maybe create a hidden sort column , with a substr of the url field and use this technique

Chris

614097

Chris,

that's an intersting example!
However, the problem here actually is slightly different:

I don't even want to sort for the 2nd column ("Target"), But sorting for the first one messes up the popupkey_from_query, since the form element names are not getting adjusted to the new sort order.

I hope I could explain the problem clearly enough.

Michael

CJ Bell

Sorry Michael , gone a bit over my head now , although I do struggle to visualize stuff if I can't see it in front of me !

Chris

614097

Sure.

Check the two images which I've posted above. That should help you visualize.
On the first one (without any sort) the name of the form elements is ascending and according to the rownum (i.e. f10_00, f10_01, f10_02...).

After applying sort to the first column the form names are NOT according to the rownum anymore. Nevertheless, they should be, for only then the popup key passes back the selected value to the form element at a certain ROWNUM position (here to the row at number 24, instead of the row with name f10_24, which is at ROWNUM position 1 after the sort):

    function passBack(x,y)
    {
        if (opener.document.forms["wwv_flow"].f11.length > 1)
        {
             opener.document.forms["wwv_flow"].f11[24].value = x;
             opener.document.forms["wwv_flow"].f10[24].value = y;
        }
        else
        {
             opener.document.forms["wwv_flow"].f11.value = x;
             opener.document.forms["wwv_flow"].f10.value = y;
        }
        close();
    }

The only way I see to solve that problem is to alter the builtin JavaScript in the LOV popup. Does anyone know where to find the source of this Javascript?

Michael

Denes Kubicek

Michael,

I don't think this kind of sorting is easy (cheers Chris) since you are using the apex_item
syntax. The only way I could see this working is to build your own sorting but please, don't
ask me to try that for you.

Denes Kubicek
-------------------------------------------------------------------
http://deneskubicek.blogspot.com/
http://www.opal-consulting.de/training
http://htmldb.oracle.com/pls/otn/f?p=31517:1
-------------------------------------------------------------------

614097

Denes,

Thanks for your reply.
I am not intending to write that on my own, and believe me, that wouldn't be something I would ask anyone in this forum to just try that for me ;)

Again, I think it is most straightforward to slightly adjust the JavaScript source code in the popup, since all the required information is already visible to the popup.

Do you know where I can access that popup source code?

Cheers,

Michael

Denes Kubicek

Michele,

Bingo! I already forgot I had a solution for that kind of problem too. Just put input type
hidden in front of your apex_item like in this code and you will be able to sort your
column on whatever you want.

SELECT    '<INPUT TYPE="HIDDEN" VALUE="'
       || LPAD (ROWNUM, 4, '0')
       || '" />'
       || apex_item.text (4,
                          TO_CHAR (sal),
                          7,
                          6,
                          'style="text-align:right" ',
                          'f04_' || ROWNUM,
                          NULL
                         ) sal
  FROM emp

See it woking in this example:

http://htmldb.oracle.com/pls/otn/f?p=31517:160

So, here we go. Another topic for my blog ;)

Denes Kubicek
-------------------------------------------------------------------
http://deneskubicek.blogspot.com/
http://www.opal-consulting.de/training
http://htmldb.oracle.com/pls/otn/f?p=31517:1
-------------------------------------------------------------------

614097

Wow, Denes, that's very helpful for most APEX_ITEM elements.

Unfortunately, that's not the case for POPUPKEY or DATE_PICKER elements, for they still lose their correlation between row number and form element.

Actually, all that should have been done was change the JavaScript from

             opener.document.forms["wwv_flow"].f11[24].value = x;
             opener.document.forms["wwv_flow"].f10[24].value = y;

             opener.document.forms["wwv_flow"].getElementById("f11_" + 24).value = x;
             opener.document.forms["wwv_flow"].getElementById("f10_" + 24).value = y;

Thus, the pass back function would pass back the value not to the element at number 24, but to the form element with id attribute f10_24.

Maybe someone of the APEX developers sees that and fixes that for a next release.

However, cheers for your support here. I'm sure I can use that somewhere else!

Danke

Michael

515357

I reported this problem in the following threads. Carl acknowledged it was a bug. It looks like it will be fixed in 4.0.

2730357
2823819

I was able to use text input type, and create my own popup field. It seems to be working great. It was not hard to create my own popup.

It involves creating a hidden field and a text field. The hidden field will receive return value, and text will hold display value.

APEX_ITEM.HIDDEN(6, popup_value, 'id="P160_F06_#ROWNUM#"') || 
APEX_ITEM.TEXT  (7, popup_name, 15, 30, 'readonly="TRUE"; style="color:gray"', 'P160_F07_#ROWNUM#') ||
                           '<a hre="javascript:callPopup(''' || 'P160_F06_#ROWNUM#' || ''',''' ||
                           'P160_F07_#ROWNUM#' || ''',''' || 'P160' || ''')";>' ||
                           '<img src="/i/list_gray.gif" width="13" height="13" alt="Popup"></img></a>' AS popup

Please replace hre above with href. P160 has the tabular form. P125 is the popup page. The code for callpopup in HTML Header section of P160 is below:

<script language="JavaScript" type="text/javascript">
  function callPopup (formItem1,formItem2,formItem3) {
    var url;
    url = 'f?p=&APP_ID.:POPUP:&APP_SESSION.::NO:125:P125_OPENER_ITEM1,P125_OPENER_ITEM2,P125_SOURCE_ID:' + formItem1 + ',' + formItem2 + ',' + formItem3;
    w = open(url,"winLov","Scrollbars=1,resizable=1,width=500,height=600");
    if (w.opener == null)
       w.opener = self;
    w.focus();
  }
</script>

You need to create 3 hidden items on P125. They are P125_OPENER_ITEM1, P125_OPENER_ITEM2, P125_SOURCE_ID.
P125 has javascript in HTML header as below:

<script language="JavaScript">
   function passBack(passVal1, passVal2)
   {
       var opener_item1;
       var opener_item2;

       opener_item1 = document.getElementById("P125_OPENER_ITEM1").value;
       opener_item2 = document.getElementById("P125_OPENER_ITEM2").value;

       opener.document.getElementById( opener_item1 ).value = passVal1;
       opener.document.getElementById( opener_item2 ).value = passVal2;

       close();
   }
</script>

I have made P125 dynamic and generic enough by using P125_SOURCE_ID. I use this to create SQL statements in a before header/region process. I do not pass SQL thru javascript due to security issue. With this, I am able to display multiple columns in popup compared to single column report you get with POPUPKEY API.

IF :P125_SOURCE_ID = 'P160' THEN
   :P125_SQL := 'select .....'
END IF;

The report region uses this for Region Source (PL/SQL function body returning SQL query)

BEGIN
    RETURN REPLACE(:P125_SQL);
END;

The SQL in P125 should use passback java script to return the values. Please replace hre with href below. For example,

SELECT '<a hre="javascript:passBack(' || CHR(39) || emp_id || CHR(39) || ',' ||
              CHR(39) || REPLACE(full_name, CHR(39), '\' || CHR(39) ) ||
              CHR(39) || ');">Select</a>' AS link_text

Thanks.

Ravi

1 - 9

Locked Post

New comments cannot be posted to this locked post.

Locked on Jan 12 2011

Added on Dec 13 2010

#general-database-discussions

10 comments

1,843 views

Oracle Database Discussions

NOLOGGING tables and recovery of database (and standby)

Comments

Post Details