oracle archive log destinations

been recently having a problem with oracle when the disk was getting full with archivelogs and oracle just stopped responding until the logwriter could save the log and the redo log could be switched. So I thought I should add an alternate location, which would be used if the primary one becomes invalid.

So I read the manual and did like it says:

firstly:

The first method is to use the LOG_ARCHIVE_DEST_n parameter (where n is an integer from 1 to 10) to specify from one to ten different destinations for archival. Each numerically-suffixed parameter uniquely identifies an individual destination.

secondly:

The LOG_ARCHIVE_DEST_STATE_n (where n is an integer from 1 to 10) initialization parameter allows you to control the availability state of the specified destination (n). The destination state can have three values: ENABLE,DEFER, or ALTERNATE. The value ENABLE indicates that Oracle can use the destination, whereas DEFER indicates that the location is temporarily disabled. The third value, ALTERNATE, means that the destination is an alternate. It's availability state is DEFER, unless there is a failure of its parent destination, in which case its state becomes ENABLE.

So after I added parameters to my init.ora file accordingly, the database wouldn't start!

Alert log didn't contain any errors, it would simply end with this line:

Using log_archive_dest parameter default value

But if to try starting the database from sqlplus with startup nomount, it would give this error:

ORA-00439: feature not enabled: Managed Standby

So it comes out that the Managed Standby is a feature of Enterprise Edition ONLY! And LOG_ARCHIVE_DEST_n depends on that feature and therefore cannot be used with Standard Edition.
So I have do with LOG_ARCHIVE_DEST parameter and just make the disk larger... Can't think of any other good solution now...

Administrator's guide doesn't say a word about this. It has a link although to the 9i Reference, which has a note of this dependency trick..

This parameter is valid only if you have installed Oracle Enterprise
Edition. You may continue to use LOG_ARCHIVE_DEST if you have installed Oracle
Enterprise Edition. However, you cannot use both LOG_ARCHIVE_DEST_n and
LOG_ARCHIVE_DEST, as they are not compatible.

rich text editor for web

lately have been looking for some free and crossbrowser rich text editors. Out of all the variety, picked out two which seemed the best:

1. TinyMCE
http://tinymce.moxiecode.com/
pros:
nice interface, loads faster, has a lot of commands (huge number of them). it's a practically winword editor under web. *amazed*. Has API. All browsers supported (even opera and safari)
cons:
the image and file browsers are commercial. Although it is possible to link your own filebrowser as plugin. But I couldn't find any freeware ones. And who wants to code, if there is something ready and for free? Therefore..

2. FCKeditor
http://www.fckeditor.net/

pros: also very powerful, a lot of commands, API. And has a free file and image browser included.
cons: interface is a little bit slow and loads a little bit slower than Tiny. Neither Opera nor Safari are supported.


I personally have picked the FCKeditor, mostly because of the free filebrowser. And it's not my problem if someone likes to use stupid browsers ;)
Othewise would have picked the TinyMCE...

Hello World! :)

here comes the first record.

I have been into some ajax programming lately. Feels like this is the future of the application development in the whole. Google's spreadsheet has totally amazed me. There is even some server->client communication. How is that implemented I wonder... Got to learn it someday.

Today I have been into some beginner programming using jQuery (http://jquery.com/)
It's really easy to learn and it saves a lot of time when it comes to DHTML tricks.

The best thing with it, is that you don't have to specify events on objects using something like onclick="foo()". With jQuery you set the events from the script area. And what is really nice is that you can select many object (and do it very easily) at once, using XPath and/or CSS.

So for example you set up a click event on a button called "btn1" like this:

$("button[@name=btn1]").click(function(){ alert("button clicked!") });

this will register an "onclick" event with the button who's name parameter is equal "btn1"

But what I was fighting with today was: how to reference the parent windows out of an iframe?
Turned out to be like this:

parent.$("element").action()

So it was as easy as putting "parent" in front of the $ sign.
Oh and also that the parent page must include the jquery source too.

Particularly what I have built today. Is a script which uploads pictures "on the fly", without a page reload. And immediately displays the newly uploaded picture on the page. For this matter I have used an iframe which had an upload form inside of it. After the form submits, the php script saves and registeres the picture in db and outputs some jQuery code, which dynamically adds the new picture thumb to the parent frame (this is why I needed to reference the parent windows with jQuery). So this way it looks as if picture being uploaded totally dynamically, without a page reload.

Soon my work will be done, I'll post a link to it.