Why use OPEN before using LOB ???

For example : when I use APPEND function like this
DECLARE
sour_clob CLOB:='APPENDING CONTENTS';
dest_clob CLOB;
BEGIN
SELECT c_lob INTO dest_clob FROM lob_tbl FOR UPDATE;
DBMS_LOB.APPEND( dest_clob , sour_clob );
COMMIT ;
END;
since LOB is not open , I can still use it to do some operations.
Is there anything I did wrong ? I don't know why or when to use open.
Can anyboby tell me ? I 'll appreciate that so much .

Thanks a lot , Raghu :>
You mean that OPEN function is used for BFILE to open files.I can understand that now.
Now OPEN funciton overrides for CLOB BLOB , which means sometimes we have to open CLOB BLOB outside database ?

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From this page - Facebook Content Sharing Best Practices
I read:
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I can't find any true tangible benefits to using XML
to transfer data from legacy systems, in comparison to say, using an external file and loading into existing
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Why use Oracle 8.1.5 for Linux?

Dear,
If it is really pain in the ass to install Oracle on Linux, why
use it? I have spent more than 4 full days (more than what I
excepted) to try to install Oracle on a Linux box.
I guess I will go for mySQL since I can just install the RPM
package and do not have to worry those critical issues.
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Best Regards,
Alex Yu
null

I have some sympathy for your plight. I have 8.0.5 installed on
RedHat Linux. Apart from patching the Pro*C configuration file,
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It does seem 8.1.5 is more problematic. If you're purely
evaluating Oracle, maybe you should consider 8.0.5 until 8i
stabilises unless you really are gagging for some 8i feature.
Alex Yu (guest) wrote:
: Dear,
: If it is really pain in the ass to install Oracle on Linux, why
: use it? I have spent more than 4 full days (more than what I
: excepted) to try to install Oracle on a Linux box.
: I guess I will go for mySQL since I can just install the RPM
: package and do not have to worry those critical issues.
: Just a note for Oracle, please design a better Installer next
: time which is going to work! Thank you.
: Best Regards,
: Alex Yu
null

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Hi All,
Can any one suggest , Why Using Top Link (Build-in Insert, Select etc. operation) is best in DB Adapter over using custom query?
Thanks

Hi Vikky,
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Thanks
Steve

Why use interlaced ?

We shoot with DVCpro50 at 24p.
A few questions.
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Interlaced footage looks like crap. Stills look horrible in an interlaced timeline - why ever use it ?
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Fist off - thanks for the help on part 4.
I know how TV works and why NTSC was invented over a half century ago.
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Why use symbol { } in the following script?

Why use symbol *{ }* in the following script?
<read-write-backing-map-scheme>
<scheme-name>SampleDatabaseScheme</scheme-name>
<internal-cache-scheme>
<local-scheme>
<scheme-ref>SampleMemoryScheme</scheme-ref>
</local-scheme>
</internal-cache-scheme>
<cachestore-scheme>
<class-scheme>
<class-name>com.tangosol.examples.coherence.DBCacheStore</class-name>
<init-params>
<init-param>
<param-type>java.lang.String</param-type>
*<param-value>{cache-name}</param-value>*
</init-param>
</init-params>
</class-scheme>
</cachestore-scheme>
</read-write-backing-map-scheme>
Thank you very much
Edited by: jetq on Jun 24, 2009 6:26 PM

Hi Frank,
In the example, the "{cache-name}" is supposed to be replaced by the database's table or view name that will be queried for the data to be cached. It's purpose is demonstrate how to pass parameters to the class constructor.
Regards,
Harv

Why use layer masks and adjustment layers?

I've been using PSE and CS successfully for years.
One thing I have never understood is: why use layer masks and adjustment layers, instead of simply creating a copy of the subject layer (the one I want to make changes to) and experimenting with that? It's quick (Ctrl-J), I can do it as many times as I want, I'm not affecting my Background layer. If I like the changes, I can keep them. I can switch the copy on and off to compare with the Background layer. I can do any type of blend or combination I desire. I can insert Gradient layer(s), select any part of the copy and (Ctrl-J) create a new layer containing only the selected part. I can adjust size, rotate, do anything.
It almost seems that "layer mask" and "adjustment layer" are mainly another layer of terminology; can anyone explain (preferably in 50 words or less) how they are intrinsically different from or superior to working with copies of the Background layer? What can be done with them that can't be done simply using copies of the Background layer?

Here's a very basic example of the advantage of using a layer mask.
I have this picture of a sunflower and I want to convert the background to black & white, leaving just the flower in color. I duplicated the Background layer, converted it to B&W and proceeded to use the Eraser to uncover the flower color. But I made a mistake and erased outside the flower. There is no way to correct this other than deleting the layer and starting again.
Now let's use a layer mask on the B&W layer. Set the Foreground/Background colors to the defaults black/white. Using the Brush tool paint on the mask with black to reveal the color. Here I painted too far, revealing a green leaf in the background. No need to start over. Simply switch to white and paint the excess to convert back to the B&W.
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Please tell me
why using workarea for internal table is better in performance

Hi Vineet ,
Why would we choose to use an internal table without a header line when it is easier to code one with a header line?
it has following reason.
1)Separate Internal Table Work Area:
The work area (staging area) defined for the internal table is not limited to use with just one internal table.
take ex-
Suppose you want two internal tables for EMPLOYEE one to contain all records and one to contain only those records where country = USA. You could create both of these internal tables without header lines and use only one work area to load data into both of them. You would append all records from the work area into the first internal table. You would conditionally append the USA records from the same work area into the second internal table.
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3) Nested Internal Tables: If you want to include an internal table within a structure or another internal table, you must use one without a header line.
If this one is helpful ,then rewards me
Regards
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Why use synchronized to decorate an object which its type is Vector

Hello,guys.
Recently,I readed the source code of java.util.Observable.Unfortunately,I encounted some problems。In the source code ,there is an object named obs.Its type is Vector. As we all know,Vector is thread-safe.why use synchronized in below code?
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Edited by: qiao123 on Dec 21, 2009 7:07 PM

My " NewBie" Definition of Thread Safe :Is of no interest. It already has a definition and that isn't it.I wanted to make clear what my definition is.
The [JLS DEF FOR COLLECTION|http://java.sun.com/j2se/1.4.2/docs/api/java/util/Collections.html] says:
That is the Javadoc for Collections actually, nothing to do with the JLS or Collection.They are authoritative links for Java Language and the discussion in hand, not Fantasies of Lucy Aunty.
So,how do we draw any inference(s) here?Yes, that you have selectively quoted the Javadoc, which goes on to talk about how you have to use it when iterating.Still not answering my question,Sir.
ejp,you seem to have knowledge but you don't have the attitude to forward the same to others or bear what others say,even when initiative has been taken by others to put forward a problem.
P.S : Not all hackers are arrogant and not all arrogant are hackers.
Another P.S : Waste of my time really !!!
Edited by: punter on Dec 22, 2009 1:09 AM

Why use KeyExtractor here? How about remove it?

Please see the following script:
setResults = cache.entrySet(new AndFilter(
new LikeFilter(new KeyExtractor("getLastName"), "S%",
(char) 0, false),
new EqualsFilter("getHomeAddress.getState", "MA")));Why use KeyExtractor here? How about remove it and make it like:
setResults = cache.entrySet(new AndFilter(
new LikeFilter("getLastName"), "S%"),
new EqualsFilter("getHomeAddress.getState", "MA")));Is this scrip right?
Edited by: jetq on Oct 23, 2009 2:08 PM

I Googled for KeyExtractor and the likeliest-looking thing was javadocs for com.tangosol.util.extractor.KeyExtractor on an Oracle site.
Why don't you check around the Oracle developer site for a forum specifically about whatever product this is?

Why use daemon?

Hello friends.
Could anyone help me with the use of Daemon.
How it works?
For work?
Why use the daemon instead of a process chain?
Research among a few things but nothing I replied to these questions.
Very thanks.

Go through the below document on Real -Time Data Acquisition. This will explain u what is the Daemon and how it works.
http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/706af360-ba17-2c10-debe-8b0e6e1417c9?QuickLink=index&overridelayout=true

Why use customized / particular exceptions instead java.lang.Exception

Hi,
Do any of you guys know where can I find a theorical statement / explanation about why use particular / customized exceptions instead java.lang.Exception? I am aware that it consumes more resources and becomes a heavier object, as well as the clearness when coding and all that stuff; however, my boss wants to see a tech document where all this is clearly stated. Any resource over there?
Regards

It is better to throw specific--or at least module- or
package-specific--excpetions, rather than Exception,
because then the caller knows what to expect. However,
if you declare "throws Exception", the caller can
still catch IOException, SQLException, etc.,
separately. He'll just have to be a really good
guesser as to which ones he should catch.True.
Also, there's no point in declaring "throws
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unchecked exception) inside the method, then you
should document it in the javadoc comments, but you
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I'm assuming overhead caused by extending classes.At
the worst, it would be miniscule, or so I wouldthink.
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SuperClass1 + SubClass1 + SubClassOfSubcCass1 = Memory usuage for SubClassOfSubClass1.
Since adding postivie number will always end up increasing data, SubClassOfSubClass1 will use more dtat than SuperClass1.
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Why use Dreamweaver for create web pages

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Why use OPEN before using LOB ???

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