Best Practice PK Generation: 'before insert on trig' vs. rolling yer own

Experts,
I have a form with the standard Create/Delete/Apply Changes buttons.
When someone hits "Create", I have a trigger that fires on the table as "before insert on". It hits a sequence to get a new primary key for the record which is about to be created.
Another way of doing it is to run a page-level PL/SQL computation, and get SEQUENCE_NAME.Nextval, and stuff it into the appropriate page-level item. "Create" will then fire the insert after this computation and it amounts to the same thing as the trigger.
Loaded question: Which way is better?
My DBA recommends to "roll my own" using the page-level computation. His reasoning is if my applications scale up to a lot of users running inserts at the same time, the trigger will be a bit of a drag.
On the other hand, I like having the trigger "on the database" and not having to worry much about it. It is one less thing that I have on my page.
Dan

I'm not the end-all be-all of Oracle expertise, so I
refer to those who are:
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P1
1_QUESTION_ID:4343369880986#34562653805149
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P1
1_QUESTION_ID:4343369880986#76218085672062
A couple links I could quickly find on the subject.
I'm sure there's plenty more out there.Taking Tom's answers out of context don't invalidate the problems of a trigger"less" approach.
As to the other concerns, personally I would argue
that a separation between application logic and GUI
shouldn't go so far as to remove all data management
concerns, such as using primary keys (and otherwise
indexed fields) to access data.Still, what happens if you want to user other methods of access, for example sqlldr/external tables, ODBC/.NET, etc.?
Also, I prefer to keep rogue applications/scripts
away from my data if possible :). Translated: Everyone has to incorporate sequences in any INSERT statement. For BULK inserts, this maybe the way to go, but you can always check if the PK column is NULL, which should give the trigger a bit of performance improvement.
But on the chance
that they do go selecting from incorrect sequences it
will be their own problem. Or your's if other applications start generating error messages.
It'll be refused insert
until it can (randomly, I don't care) provide a
unique value for that column. Yay for constraints!Finding the source of the problem might be where unnecessary work has to be put in.
I agree there are a few valid uses for such a
trigger, I've done it myself. But on the whole, it's
best to avoid it when possible.Can't follow your argument, really. Maybe another agree to disagree topic?
C.

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MrBonk wrote:
> Just wondering if there's a 'best practice' approach for
handling potential
> duplicate database inserts in CF. At the moment, I query
the db first to work
> out if what I'm about to insert already exists. I figure
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> send the SQL and catch the error, which would then tell
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> in there, but that seemed a bit dodgy to me. Which is
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<br>
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TV Shows: I watch a lot of MST3K, which I have organized into iTunes as TV shows, split into seasons, the works. The problem that has arisen, therefore, is the one of selective synchronization - you cannot specifically select the TV show you want to sync to the device, instead getting the choices to sync all, unwatched, or latest shows. This is problematic when each show is 700MB large. Here's the work around - select all of the episodes of a specific show and right click, selecting "Mark as Not New", removing all of the little blue dots from the episodes. Select the one, three, or five episodes, and right click them, selecting "Mark as New", then sync the last one, three, or five unwatched episodes. The shows you selected will sync.
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Mail:
POP accounts - too many unread messages: When first adding a POP account, all of the messages downloaded to the phone arrive as unread. Tapping a message, tapping back, and then tapping the next message can get tedious. Here's the workaround - tap the small down arrow to the upper right hand side of the screen, watching closely to the number next to Inbox. When that number goes down by one, tap the arrow again. If that number hasn't gone down yet, wait a sec, and do not try to tap tap tap tap tap, you'll flood the input queue and crash Mail.
Syncing Mail accounts - All too often people blame the iPhone when their mail does not work. A perfect test is sync you accounts from Mail. If they work in mail, they'll work on the phone, if they are unreliable in Mail, they will also be unreliable on the phone. The Mail client on the iPhone is just as powerful as any other mail client in terms of how it connects to mail servers, if you are having problems you need to check your settings before blaming the hardware. If you prefer to leave your install of Mail.app alone, create a new user account on your Mac, set up all of the accounts you want there, and use iTunes to sync that data to the phone. Make sure to remove that portion of sync from your actual user account's instance of iTunes, however, or it will all sync back.
This message has not been downloaded from the server: This message has snagged a couple users, but upon investigation, these users have filled their iPhones to the absolute brim with music and video. It hasn't been downloaded from the server because there is no space to download to - this also applies to the Camera application dumping to the Home screen. Because there is no space, it can't add any new data. Make some room, then be patient as the mail client gets to that message in cleanup (often a sync or reboot will clear it up).
Safari:
Safari and iPod: Many users have reported iPod stopping in the middle of browsing, often pouting and pursing their lips crying, "This is terrible, I can't even browse the web and listen to music at the same time?". I then check their phone, and lo and behold they have upwards of eight separate pages open at the same time. This device (like every other computer out there) has a finite amount of memory, each page taking up a significant portion depending on how busy the page is. I've routinely gotten through entire albums while browsing through Safari, but I've got one page open in total, and it's usually mostly text. Keep it to one or two pages open and iPod will run forever if you let it.
Web Apps: "This web app is terrible, it keeps booting me to Home!" When was your last reboot? How many other pages are open? In the same vein as Safari and iPod, Web Apps need a good deal of breathing room - give it to them. Close down other pages, stop iPod, or even reboot. Give the app a clean slate and it will perform, every time. iPhoneRemote users will attest to this.
iCal:
Multiple Calendars - Default Calendar: When adding a new appointment, it adds to the default calendar. Appointments can't be shunted to the correct calendar until after sync anyway, so create an "iPhone" calendar and make that the default. Because it's in that calendar, you'll know enough to move it to the appropriate calendar after sync.
Please feel free to add your own best practices, and ask questions, too.

is there any application you can get for the iphone to enlarge text and phone numbers ?
If included with an email or on a website, yes with no application needed.
If you are referring to the text size for your iPhone's contact list, no.
can you insert a phone number from your contact list into a text message ?
No.
i cant seem to figure it out, does the alarm clock work if you turn off the phone at night,
No - powered off with the iPhone means powered off. Any phone that provides for this is not powered off - it is in deep sleep or deep standby mode, which the iPhone does not support. If you don't want your phone ringing or don't want to receive SMS at night but you want to use the iPhone's alarm feature as a wake-up alarm, you can turn on Airplane Mode before going to bed, which will also conserve the battery if your iPhone is not plugged in at night.
can you send a multi media text message ?
No.

Best Practice PK Generation: 'before insert on trig' vs. rolling yer own

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