Where to put the sql

Hi,
When I develop a Java software which gets data from the user (for example a Web page) and use them for performing and put the result into the database, according to you is it almost always smarter calling an Oracle stored procedure or a package making the task or can it be usefull to put the logics-sql inside the Java code? For me it's always better to develop a strored procedure to be called, but I'd like to listen to your experience.
Thanks!

If the Java code is to run against a variety of different database products, then it is limited to the lowest common denominator between these products - the basic SQL language.
And unfortunately, such code will use the various database products non-optimally. SQL language implementations differ. Analytical SQL functions available in one product will be different or even non-existent in another.
But in this case, the Java code has little choice - and need to use bare bones SQL.
Usually this is only a problem for ISVs that are developing commercial client products. For most others, we have a single database product as the strategic product for the selected IT architecture.
So in this case it makes sense to use and leverage all the features of that database products. Enabling the Java code to optimally use the database. Enable the database to perform and scale.
In the case of Oracle, that typically means not having Java developers code SQL at all. Not because they are SQL/Oracle idiots (which can be argued). But because of providing a formal and abstract data interface allows far greater flexibility, maintainability and usability.
It enables you to to deal with SQL and SQL related performance inside this interface, without having to touch and recompile a single byte of Java client code.
It enables you to deal with database structure changes via this interface, without having to touch and recompile a single byte of Java client code.
So it makes a LOT of sense to create and use such an interface - not just for Java clients, but all clients. Allowing all clients to share the same interface and be subject to the same validation and business rules in a coherent and consistent fashion.
In Oracle, this interface will be written using PL/SQL packages - and will typically return ref cursors to the clients.

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Where to put the commit in the FORALL BULK COLLECT LOOP

Hi,
Have the following LOOP code using FORALL and bulk collect, but didnt know where to put the
'commit' :
open f_viewed;
LOOP
fetch f_viewed bulk collect into f_viewed_rec LIMIT 2000;
forall i in 1..f_viewed_rec.count
insert into jwoodman.jw_job_history_112300
values f_viewed_rec(i);
--commit; [Can I put this 'commit' here? - Jenny]
EXIT when f_viewed%NOTFOUND;
END LOOP;
commit;
Thanks,
- Jenny

mc**** wrote:
Bulk collect normally used with large data sets. If you have less dataset such as 1000-2000 records then you canot get such a performance improvent using bulk collect.(Please see oracle documents for this)
When you update records Oracle acquire exclusive lock for that. So if you use commit inside the loop then it will process number of records defined by limit parameter at ones and then commit those changes.
That will release all locks acquired by Oracle and also teh memory used to keep those uncommited transactions.
If you use commit outside the loop,
Just assume that you insert 100,000 records, all those records will store in oracle memory and it will affect all other users performance as well.
Further more if you update 100,000 records then it will hold exclusive lock for all 100,000 records addtion to the usage of the oracle memory.
I am using this for telco application which we process over 30 million complex records (one row has 234 columns).
When we work with large data sets we do not depends with the oracle basic rollback function. because when you keep records without commit itb uses oracle memory and badly slowdown all other processes.Hi mc****,
What a load of dangerous and inaccurate rubbish to be telling a new Oracle developer. Commit processing should be driven by the logical unit of a transaction. This should hold true whether that transaction involves a few rows or millions. If, and only if, the transaction is so large that it affects the size constraints of the database resources, in particular, rollback or redo space, then you can consider breaking that transaction up to smaller transactions.
Why is frequent committing undesirable I hear you ask?
First of all it is hugely wasteful of rollback or redo space. This is because while the database is capable of locking at a row level, redo is written at a block level, which means that if you update, delete or insert a million rows and commit after each individual statement, then that is a million blocks that need to go into redo. As many of these rows will be in the same block, if you instead do these as one transaction, then the same block in redo can be transacted upon, making the operation more efficient. True, locks will be held for longer, but if this is new data being done in batches then users will rarely be inconvenienced. If locking is a problem then I would suggest that you should be looking at how you are doing your processing.
Secondly, committing brings into play one of the major serialization points in the database, log sync. When a transaction is committed, the log buffer needs to be written to disc. This occurs serially for multiple commits. Each commit has to wait until the commit before has completed. This becomes even more of a bottleneck if you are using Data Guard in SYNC mode, as the commit cycle does not complete until the remote log is notified as written.
This then brings us two rules of thumb that will always lead a developer in the right direction.
1. Commit as infrequently as possible, usually at the logical unit of a transaction
2. When building transactions, first of all seek to do it using straight SQL (CTAS, insert select, update where etc). If this can't be easily achieved, then use PL/SQL bulk operations.
Regards
Andre

I changed my iPhone lately but i can't restore my last backup since it keeps saying "itunes could not restore backup because the password was incorrect" but I don't know where to put the password to make it happen... Any suggestions?

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Hi,
I am using Developer/2000 (Forms Designer) under windows 98.
Please tell me how to put the SQL-statement value (as a default value) into the field before enter-query mode. Noted that I have tried the following ways but still some problems:-
1) Place the SQL-statement into PRE_QUERY trigger in the form/block level.
There is a message box which ask 'Do you want to save the changes?'.
2) Place the SQL-statement before execute enter_query. There is still a
message box which ask 'Do you want to save the changes?'.
Any hints? Thanks. Urgent.

solved it!
1) Suppress DEFAULT save message
if form_failure then
raise form_trigger_failure;
end if;
2) Place the default value before enter-query.
Ref: Title='Default value in query field in ENTER_QUERY mode' in designer forum by CVZ
form level trigger
============
WHEN-NEW-ITEM-INSTANCE
=======================
if :system.mode = 'ENTER-QUERY' then
:block.item := 'default waarde';
end if;
3) Suppress the changes whenever leaving the default field.
if :block.item is null then
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end if;

Architecture question...where to put the code

Newbie here, so please be gentle and explicit (no detail is
too much to give or insulting to me).
I'm hoping one of you architecture/design gurus can help me
with this. I am trying to use good principals of design and not
have code scattered all over the place and also use OO as much as
possible. Therefore I would appreciate very much some advice on
best practices/good design for the following situation.
On my main timeline I have a frame where I instantiate all my
objects. These objects refer to movieClips and textFields etc. that
are on a content frame on that timeline. I have all the
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from the content frame. All this works just fine. One of the
objects on the content frame is a movieClip which I allow the user
to go forward and backward in using some navigation controls.
Again, the object that manages all that is instantiated on the main
timeline in the initialize() function and works fine too. So here's
my question. I would like to add some interactive objects on some
of the frames of the movieClip I allow the user to navigate forward
and backward in (lets call it NavClip) . For example on frame 1 I
might have a button, on frame 2 and 3 nothing, on frame 4 maybe a
clip I allow the user to drag around etc. So I thought I would add
a layer to NavClip where I will have key frames and put the various
interactive assets on the appropriate key frames. So now I don't
know where to put the code that instantiates these objects (i.e.
the objects that know how to deal with the events and such for each
of these interactive assets). I tried putting the code on my main
timeline, but realized that I can't address the interactive assets
until the NavClip is on the frame that holds the particular asset.
I'm trying not to sprinkle code all over the place, so what do I
do? I thought I might be able to address the assets by just
providing a name for the asset and not a reference to the asset
itself, and then address the asset that way (i.e.
NavClip["interactive_mc"] instead of NavClip.interactive_mc), but
then I thought that's not good since I think there is no type
checking when you use the NavClip["interactive_mc"] form.
I hope I'm not being too dim a bulb on this and have missed
something really obvious. Thanks in advance to anyone who can help
me use a best practice.

1. First of all, the code should be:
var myDraggable:Draggable=new Draggable(myClip_mc);
myDraggable.initDrag();
Where initDrag() is defined in the Draggable class. When you
start coding functions on the timeline... that's asking for
problems.
>>Do I wind up with another object each time this
function is called
Well, no, but. That would totally depend on the code in the
(Draggable) class. Let's say you would have a private static var
counter (private static, so a class property instead of an instance
property) and you would increment that counter using a
setInterval(). The second time you enter the frame and create a new
Draggable object... the counter starts at the last value of the
'old' object. So, you don't get another object with your function
literal but you still end up with a faulty program. And the same
goes for listener objects that are not removed, tweens that are
running and so on.
The destroy() method in a custom class (=object, I can't
stress that enough...) needs to do the cleanup, removing anything
you don't need anymore.
2. if myDraggable != undefined
You shouldn't be using that, period. If you don't need the
asset anymore, delete it using the destroy() method. Again, if you
want to make sure only one instance of a custom object is alive,
use the Singleton design pattern. To elaborate on inheritance:
define the Draggable class (class Draggable extends MovieClip) and
connect it to the myClip_mc using the linkage identifier in the
library). In the Draggable class you can define a function unOnLoad
(an event fired when myClip_mc is removed using
myClip_mc.removeMovieClip()...) and do the cleanup there.
3. A destroy() method performs a cleanup of any assets we
don't need anymore to make sure we don't end up with all kinds of
stuff hanging around in the memory. When you extend the MovieClip
Class you can (additionally) use the onUnLoad event. And with the
code you posted, no it wouldn't delete the myClip_mc unless you
program it to do so.

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Log out of your Cloud account... Restart your computer... Log in to your paid Cloud account
-Sign in help http://helpx.adobe.com/x-productkb/policy-pricing/account-password-sign-faq.html
-http://helpx.adobe.com/creative-cloud/kb/sign-in-out-creative-cloud-desktop-app.html
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Does your Cloud subscription properly show on your account page?
If you have more than one email, are you sure you are using the correct Adobe ID?
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Press the power button.
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In HELLO Where doI put the email address of a contact.

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Hi All,
Oracle 11.2.0.3 on RedHat.
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2 from v$active_session_history
3 where sample_time between to_date('20120704012000','yyyymmddhh24miss') and
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Where can I find the text for this SQL id 16t1tpr7mdqnf ?
This SQL has run about 8 hours ago.
Thanks in advance

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I have a big doubt and so does my CIO.
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[http://blog.vinodsingh.com/2008/11/environment-specific-property-with.html|http://blog.vinodsingh.com/2008/11/environment-specific-property-with.html]
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Where to put the sql

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