Simple RAID question

I'm a lifetime PC user who just switched to Mac. I do video work, and in my PC setup, I like to have one OS/Apps drive and 2 other drives that I put in RAID 0 to speed up video editing. I back up all completed projects, so I don't care about mirroring. I've been looking at RAID posts, and it sounds like you have to wipe ALL drives clean to set up a RAID on a Mac. Can I just add in my two drives for striping, and leave my system drive alone?
Thanks in advance for any help.
2.66 Ghz Quad Xeon, 2 GB RAM, 250 GB HD Mac OS X (10.4.9)

Hatter,
Your suggestion here is just what I've been looking for.
Drive #
1 - boot drive with OS and all applications
2 - data and projects
3 and 4 - RAID for editing
You could put your media files or data and backups on external drives, FireWire.
Question here for anyone...please!
I work in FCP 5.1.4 and with my setup I feel it should be faster and I've been wanting to setup a RAID 0 setup. I have 2 of my drives (2 & 3) which is a TB combined that I'd like to turn into a RAID ) to speed up rendering, editing etc.
Can you point me in the direction in how to do that? As I'm converting these 2 drives, is there anything I should be careful about?
And, in FCP under pref's, it won't allow me to allocate more than 2560MB. ****, I've got 16GB in my system. So, is there anything here I can do to speed things up and allocating more ram to the program?
One other thing..if I do convert Drive 2 & 3 to a RAID 0 are there any down side issues that this causes. Crashes, App confusion and stalling etc?
MacPro, 2 x 3GHz Dual Core, 16GB ram, 4 x 500GB drives Mac OS X (10.4.9)
MacPro, 2 x 3GHz Dual Core, 16GB ram, 4 x 500GB drives Mac OS X (10.4.9)
MacPro, 2 x 3GHz Dual Core, 16GB ram, 4 x 500GB drives Mac OS X (10.4.9)

Similar Messages

Windows Server 2012 Storage Spaces Simple RAID 0 VERY SLOW reads, but fast writes with LSI 9207-8e SAS JBOD HBA Controller

Has anyone else seen Windows Server 2012 Storage Spaces with a Simple RAID 0 (also happens with Mirrored RAID 1 and Parity RAID 5) virtual disk exhibiting extremely slow read speed of 5Mb/sec, yet write performance is normal at 650Mb/sec in RAID 0?
Windows Server 2012 Standard
Intel i7 CPU and Motherboard
LSI 9207-8e 6Gb SAS JBOD Controller with latest firmware/BIOS and Windows driver.
(4) Hitachi 4TB 6Gb SATA Enterprise Hard Disk Drives HUS724040ALE640
(4) Hitachi 4TB 6Gb SATA Desktop Hard Disk Drives HDS724040ALE640
Hitachi drives are directly connected to LSI 9207-8e using a 2-meter SAS SFF-8088 to eSATA cable to six-inch eSATA/SATA adapter.
The Enterprise drives are on LSI's compatibility list. The Desktop drives are not, but regardless, both drive models are affected by the problem.
Interestingly, this entire configuration but with two SIIG eSATA 2-Port adapters instead of the LSI 9207-8e, works perfectly with both reads and writes at 670Mb/sec.
I thought SAS was going to be a sure bet for expanding beyond the capacity of port limited eSATA adapters, but after a week of frustration and spending over $5,000.00 on drives, controllers and cabling, it's time to ask for help!
Any similar experiences or solutions?

Has anyone else seen Windows Server 2012 Storage Spaces with a Simple RAID 0 (also happens with Mirrored RAID 1 and Parity RAID 5) virtual disk exhibiting extremely slow read speed of 5Mb/sec, yet write performance is normal at 650Mb/sec in RAID 0?
Windows Server 2012 Standard
Intel i7 CPU and Motherboard
LSI 9207-8e 6Gb SAS JBOD Controller with latest firmware/BIOS and Windows driver.
(4) Hitachi 4TB 6Gb SATA Enterprise Hard Disk Drives HUS724040ALE640
(4) Hitachi 4TB 6Gb SATA Desktop Hard Disk Drives HDS724040ALE640
Hitachi drives are directly connected to LSI 9207-8e using a 2-meter SAS SFF-8088 to eSATA cable to six-inch eSATA/SATA adapter.
The Enterprise drives are on LSI's compatibility list. The Desktop drives are not, but regardless, both drive models are affected by the problem.
Interestingly, this entire configuration but with two SIIG eSATA 2-Port adapters instead of the LSI 9207-8e, works perfectly with both reads and writes at 670Mb/sec.
I thought SAS was going to be a sure bet for expanding beyond the capacity of port limited eSATA adapters, but after a week of frustration and spending over $5,000.00 on drives, controllers and cabling, it's time to ask for help!
Any similar experiences or solutions?
1) Yes, being slow either on reads or on writes is a quite common situation for storage spaces. See references (with some of the solutions I hope):
http://social.technet.microsoft.com/Forums/en-US/winserverfiles/thread/a58f8fce-de45-4032-a3ef-f825ee39b96e/
http://blogs.technet.com/b/askpfeplat/archive/2012/10/10/windows-server-2012-storage-spaces-is-it-for-you-could-be.aspx
http://social.technet.microsoft.com/Forums/en-US/winserver8gen/thread/64aff15f-2e34-40c6-a873-2e0da5a355d2/
and this one is my favorite putting a lot of light on the issue:
http://helgeklein.com/blog/2012/03/windows-8-storage-spaces-bugs-and-design-flaws/
2) Issues with SATA-to-SAS hardware is also very common. See:
http://social.technet.microsoft.com/Forums/en-US/winserverClustering/thread/5d4f68b7-5fc4-4a3c-8232-a2a68bf3e6d2
StarWind iSCSI SAN & NAS

Simple/silly question: how do I set/change default font/color for outgoing mail messages?

Simple/silly question: how do I set/change default font/color for outgoing mail messages?

Just a suggestion..........
Download Thunderbird. Easier to use when it comes to what you want to do w/your emails.

4 Simple Flash Questions that Are Stumping Me!

What is the Frame Rate for Web Animations
Q1. I am making an animation which will be played on the web. What is the default frame rate (fps) of Flash CS5? And what is the frame rate of for web?
Q2. My animation needs to be 30 seconds long. So at 15 fps that would mean I need to use 600 frames in Flash?
How Do I Mask everything so all I see is the Content on the Stage?
I have a wide image that extends past my movies stage size so when I preview my movie the image is visible. How do I mask out anything that extends past my movies window size? I believe I can create a layer named "mask" and place it above all other layers, but I forget how to make the mask. Any help is appreciated.
How to Fade a Graphic
I have a graphic element (some type) and I want it to fade from 0% to 100%. In older versions of Flash I could just select the symbol and then set it's alpha value to 0%, move a few keyframes and then set the alpha to 100%. Voila! but now it doesn't seem to work that way. How can I do this in CS5?

Ned, it says 24 fps which means there is 24 frames per second so each 24 frames is 1 second.
Date: Fri, 4 Nov 2011 05:35:16 -0600
From: [email protected]
To: [email protected]
Subject: 4 Simple Flash Questions that Are Stumping Me!
    Re: 4 Simple Flash Questions that Are Stumping Me!
    created by Ned Murphy in Flash Pro - General - View the full discussion
1 You can create your character as a movieclip and copy/paste that movieclip from one file to another. 2. One way to create a movieclip is to copy all the frame of the animation's timeline (select them all, right click the selection, choose Copy Frames), then create a new movieclip symbol (Insert -> New Symbol...etc) right click on its only keyframe and chhose Paste Frames. THat will put all the layers and frames you copied into the movieclip The only way to come close to being certain about the timing of you animation is to use code to keep track of the time, something like getTimer().. The frame rate that a file plays at is not a reliable means of dictating the time it takes due to a variety of factors which include the amount of content you are trying to process and performance limits of the user's machine.
     Replies to this message go to everyone subscribed to this thread, not directly to the person who posted the message. To post a reply, either reply to this email or visit the message page: http://forums.adobe.com/message/4007420#4007420
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Simple performance question

Simple performance question. the simplest way possible, assume
I have a int[][][][][] matrix, and a boolean add. The array is several dimensions long.
When add is true, I must add a constant value to each element in the array.
When add is false, I must subtract a constant value to each element in the array.
Assume this is very hot code, i.e. it is called very often. How expensive is the condition checking? I present the two scenarios.
private void process(){
for (int i=0;i<dimension1;i++)
for (int ii=0;ii<dimension1;ii++)
for (int iii=0;iii<dimension1;iii++)
    for (int iiii=0;iiii<dimension1;iiii++)
         if (add)
         matrix[i][ii][iii][...] += constant;
         else
         matrix[i][ii][iii][...] -= constant;
private void process(){
if (add)
for (int i=0;i<dimension1;i++)
for (int ii=0;ii<dimension1;ii++)
for (int iii=0;iii<dimension1;iii++)
    for (int iiii=0;iiii<dimension1;iiii++)
         matrix[i][ii][iii][...] += constant;
else
for (int i=0;i<dimension1;i++)
for (int ii=0;ii<dimension1;ii++)
for (int iii=0;iii<dimension1;iii++)
    for (int iiii=0;iiii<dimension1;iiii++)
       matrix[i][ii][iii][...] -= constant;
}Is the second scenario worth a significant performance boost? Without understanding how the compilers generates executable code, it seems that in the first case, n^d conditions are checked, whereas in the second, only 1. It is however, less elegant, but I am willing to do it for a significant improvement.

erjoalgo wrote:
I guess my real question is, will the compiler optimize the condition check out when it realizes the boolean value will not change through these iterations, and if it does not, is it worth doing that micro optimization?Almost certainly not; the main reason being that
matrix[i][ii][iii][...] +/-= constantis liable to take many times longer than the condition check, and you can't avoid it. That said, Mel's suggestion is probably the best.
but I will follow amickr advice and not worry about it.Good idea. Saves you getting flamed with all the quotes about premature optimization.
Winston

A few simple Logic questions...please help.

I have a few probably simple Logic questions, that are nonetheless frustrating me, wondering if someone could help me out.
1. I run Logic 8, all of the sounds that came with logic seem to work except organ sounds. I can't trigger any organ sounds (MIDI) on Logic, they won't play. I have a Yamaha Motif as my midi controller.
Any idea why?
2. I've starting running into a situation where I will record a MIDI track, the notes are recorded but they won't playback. The only track effected is the one that was just recorded. All other midi tracks playback.
I have to cut the track, usually go out of Logic and back in, re record for it to playback properly. Any idea why this may be happening?
3. How important is it to update to Logic 9. Are there any disadvantages down the road if I don't upgrade. If I purchase the $200 upgrade, do I get a package of discs and material, or it just a web download.
Any help is appreciated!
Colin

seeren wrote:
Data Stream Studio wrote:
3) You get a full set of disks and manuals.
They're including manuals now?
I think his referring to the booklets ...on how to install etc
It would be great to see printed manuals though ...I love books especially Logic/Audio related !!
A

Newbie FCP HDV monitoring and RAID questions

Hello forum gods.
First off, I must confess - I am a defector seeking assylum in the the Mac camp. I am a born-and-bred Windows person, and a longtime Avid editor who just made the jump and purchased the Mac-Pro with all the bells and whistles, and FCP Studio. I did this to accompany my JVC ProHD cam and deck.
I have no idea what I am going to do with the time I used to spend scanning for viruses and trojans. I am thinking I may write a novel, or build a house by hand - but that is another topic.
Now that the confession is out of the way - we can move on to the actual questions.
<big breath>
Ok - so I have this new fancy shiny computer, deck, camera, and monitors - one of which is the Sony 23" that is comparable to the Apple 23. I do not have a Kona or Blackmagic card because I was told that I did not need one right away - though I do plan on getting one later. For monitoring, I was going to use the firewire in/out of the JVC deck and convert the signal via the component outs to another HD monitor. This would bring the total monitors on the system to 3 - a 19" for the edit screen, the 23" for the video playback in FCP and the braodacast HD for monitoring the final signal.
Is this workable?
Now for the second question - storage and RAID.
Most of my footage will be either SD or HDV. Eventually I'll be going to XDCam, but that's a bit down the road. I have the internal 250 gigger that came in the Mac, and I purchased additional 500gb SATA II drives that I was going to use to set up a RAID. Should I do this internal or external? Will it work? What else do I need? What is the meaning of life?
Thanks for your replies. My credit card is anxiously awaiting your suggestions
G5 Quad Mac OS X (10.4.8)
G5 Quad Mac OS X (10.4.8)

Some question back atcha:
1) When you say you'll be working in SD, what do you
mean? Typically, SD refers to uncompressed 601, 720 X
486. Or are you referring to DV NTSC?
DV NTSC and/or the myriad formats that the JVC100 can do.
2) Your Profile says you have a Quad G5, but your
post says it's a MacPro. Which is it?
Sorry - Consider that my first public gaffe in the new Mac world. I bought the Mac Pro. Time to change my profile. I bought it last week - it isn't even here yet. Supposed to be delivered today...
3) Are you wanting to see your HDV sequence on a
external video monitor while you're editing? If so,
you'll need the Kona card (or the Blackmagic card,
but I don't do BMD, only Aja, so I don't know about
the Blackmagic offerings.)
I've read about the Cinema Preview function and although I know that this isn't the best idea for monitoring, wouldn't it work? On the JVC deck, it has the firewire output/input and component outs (among others) so in E-to-E mode, couldn't the deck act as my converter for monitoring on the broadcast monitor? If not - I have a line on a Kona-2 with the BOB for about $1400. Deal or no deal?
Now as for your RAID question, you can do either
internal or external. Just don't include the drive
that contains your system folder in the RAID.
I was planning on using the 250 for all my system files and the 2-500 giggers as my edit drives. Sound good?
EDIT: As for the meaning of life, go ask your father.
Gaah... He handed me "The Hitchiker's Guide to the Galaxy" and told me to get to reading....
Thanks for the help. Lord knows I need it.

Simple Quick Question

wrong section, post was moved.
Message was edited by:
Rob17

you titled "simple quick question"...
.. complicated to answer..
a) the TermsOfUse of the iTS don't allow any processing of purchased files, these are "copy protected"..
b) iM has a voice-over function..
c) iM is a video-edit app.. easy to use... just learn to handle it...
d) iM allows to "extract" audio (=muting the original audio, adding your own..)
e) to learn iM, spend some time here: http://www.apple.com/ilife/tutorials/imovie/index.html
f) use pencil and paper first! WRITE and scribble, what shall happen when in your movie/parody... make a script, draw a storyboard .. THEN launch iM.. in other words: think first, then edit.. iM is just a tool, it does not "create"... Picasso needed a papertowel and half a stencil to create art....
g) to get comfortable with iM, start with your own, small, short (3min!) project... import some stills, edit them, add a funny voice-over, add sounds, add music... good? make a bigger one...
h) .. in our Lecture II, we teach you how to import shows from TV, youtube, wherever..
standard disclaimer:
be nice to ©opyrights ...

Simple query question

hi all,
I have a XMLType table with one column - I have presently one row, in my column xmlsitedata I have stored one large xml file.The schema definition is given below:
<?xml version="1.0" encoding="UTF-8" ?>
- <xs:schema elementFormDefault="qualified" attributeFormDefault="unqualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
- <xs:element name="siteList">
- <xs:complexType>
- <xs:sequence>
<xs:element name="site" type="siteType" minOccurs="0" maxOccurs="unbounded" />
</xs:sequence>
</xs:complexType>
</xs:element>
- <xs:complexType name="siteType">
- <xs:sequence>
<xs:element name="nameEn" type="xs:string" />
<xs:element name="nameFr" type="xs:string" />
</xs:sequence>
<xs:attribute name="code" type="xs:string" />
</xs:complexType>
</xs:schema>
I have executed the query below:
select x.XMLSITEDATA.extract('/siteList/site/nameEn/text()').getCLOBVal() "stName" from wsitelist x;
and I get all english names of some 200 locations, however, there is 1 row selected and all names show up on one row. How do I split them into 200 or whatever rows?
Thanks,
Kowalsky

Have a look at the answer provided in the following thread.
very simple XML question
This may solve your problem.
use xmlsequence.
Alvinder

Simple Apple RAID question...

New MacPro, Apple RAID Card, 4 1TB drives, all included in the RAID 5 array that has been created and initialized in RAID Utility booted from the OS install disk. All looks well ATM.
I now want to partition this array into two partitions. One 300 GB for OS/Apps, the other 2.x TBs for data. Someone mentioned I should partition using the RAID Utility, but can't figure out how to do this. Should I just be using Disk Utility to create the partitions on my new 4 drive, RAID 5 set?
Thank you!! The RAID Utility user manual has no mention of this, and finding this answer on the internet is difficult.

That explains the RAID setup, which I have created and successfully initialized. I never had the manual, but looking at it now that's exactly how I did it.
Now that it has completed, I have a 4 disk RAID 5 "set", that is 2.x TBs in size, which is perfect. All I wanted to do was partition this set into two separate "volumes", just like you can do with any other "drive". I went into Disk Utility (booted to the install disk, the same disk that contained the RAID Utility), and created the partition in 2 minutes. I don't want to create two RAID sets, more drives in a RAID 5 set the faster, and didn't want to lose the HD space that 0+1 entails.
I'm just wondering if this was correct, if doing it this way creates issues, etc...
THANK YOU both for your responses!

MSI Neo-FIS2R build questions! & SATA RAID questions!

This is going to sound like a stupid question. And I'm not even sure that I know what I am asking.
I've built two computers so far. One with an MSI K7N2G-L and another with an MSI K7N2G-ILSR. Both nForce2 motherboards with AMD processors.
Here's what I'm getting at... I'm planning on building a new machine with either the Abit IC7-G or the MSI Neo-FIS2R (both 875P boards obviously).
Now, when I built the two nForce2 boards it was really easy. I put all of the components together, turned on the machine, the bios auto enabled settings, I put the windows xp pro cd in the cd drive and formatted the hard drive for NTFS, I then installed the OS and booted the system! Then I intstalled the drivers fromt the MSI CD. Ran Live BIOS and flashed to the most current motherboard BIOS. SIMPLE! Everything worked fine.
Here's my question. For the 875P system will everything pretty much happen the same way? Or do I need to do additional things? One of my main concerns (especially if I go with the Abit IC7-G over the MSI) is flashing the bios. Do I need a floppy drive or something? I've never flashed a BIOS outside of the Live BIOS utility. I don't want to put a floppy drive in my system! What are my options here?
Not that I want to do it, but if I needed to (say with the Abit board) HOW DO I FLASH THE BIOS WITHOUT USING THE LIVE BIOS UTILTY?
Bottom line is, I'm building this system for someone else and I want it all to be a painless experience (especially if they are looking over my shoulder).
One final question. This may sound even more stupid than the first question. I'm purchasing SATA drives ONLY. I'm not purchasing any IDE drives. So, here's my question...Can I boot from a SATA drive? What if it's in RAID 0? From the posts in the forums it appears that the SATA and RAID on these 875P motherboards either doesn't work or isn't very reliable (may potentially lose data). IS THIS AT ALL TRUE?! I'm stupid when it comes to RAID and SATA. Any help in this department would be appreciated.
Thanks.

Quote
Originally posted by ZippyGaloo
1. If I only install one SATA drive I have to set it up as a RAID anyway right? Wrong?
2. If I install two SATA drives I have to set it up as a RAID as well right? Wrong?
3. If I install two SATA drives and set up a RAID
(either 0 or 1) which drive does the OS go on?
I have never built a raid array (as yet) and have never owned a SATA disk (as yet), but from what I have read...
RAID is a method of connecting several disks together so they perform as a single disk. That means, in response to your points above:
1) If you install only one drive (SATA or not), it will not be set up as RAID.
2) If you install two SATA drives, you have the option of using them as two individual drives OR setting them up in a RAID 0 or 1 configuration.
3) Ok, RAID 0 is known as "striping" - this method makes two disks look like one big disk, that works twice as fast as the individual drives. Every time the PC writes data to the drive, it sends the first bit of data to drive 1, the second to drive 2, then drive 1 again etc etc. This speeds up the disk read/write time, as the two disks can both work simultaneously. To the OS though, the two drives appear as one. The OS will be spread across both disks - it needs both of them connected to run, take either disk out and you'll be left with half an OS (that obviously won't work)
With RAID 1 (known as "mirroring"), you still use two disks. You will only have a useable capacity of the smallest disk however (using two 40gb drives only gives you a total of 40gb of space. with RAID 0, two 40gb disks will make one big one - nearly 80gb large {I think the RAID system itself uses a bit of space}). The advantage with mirroring, is the second disk holds an exact copy of the first. If one disk goes bang, you have a duplicate copy on the second - so, to answer your point above, the OS will reside on both disks.
To summarize, RAID 0 is good for increasing speed; RAID 1 is good for increasing protection of your data as you have two copies incase a drive gives up. To get the best of both worlds you need RAID 0+1 (this method needs 4 disks though, 2 striped - then 2 mirroring the striped).
There is a lot to RAID - just search the net for some manuals if you're interested, hope this gives you an idea though (providing I've got it right!)

Simple Report Question

Post Author: scott123
CA Forum: General
I want to take the information in a simple excel table and recreate it 3 times, each time sorting/grouping on a different columnHere is the tableAnd here is the report that I'm trying to generate (first sorted by name, alphabetically, then grouped by rank, then grouped by size) I'm comfortable working with excel tables in Crystal, but I'm running into a problem repeating the information and then sorting each group separately. I also have no problem doing each group in a single report (without repeating any records), but I'd like to include all 3 groups in a single report. My apologies for how remedial this question is- I thought for sure that Crystal could do this easily but I've spent a couple of days on this and am running into a brick wall.

Post Author: pandabear
CA Forum: General
That's right Scott, and maybe make them "on demand"
sub reports so the user only has to see the data they
really want at the moment. Gives the report a nice clean look too.
PB

A simple security question

I'm trying to write a simple self-signed applet that use a jca provider but thi exception "java.security.SecurityPermission putProviderProperty.BC" is thrown. if I use a policy file, it works fine but for a beginner user is not very useful intall a new policy file.
After this I tried to write a new self-signed applet that read a file and open a ServerSocket on port 21, and it work fine without a new policy file!
My question is this: why is needed a policy file to add a provider and not to open a ServerSoket or read/write a file???????
PS
if u have an idea to resolve my problem without a policy file, tell me pls!!! IT'S URGENT!!

An applet works out of a so-called sandbox. The security restrictions can be overcome in one of two ways that you have tried:
1) by the use of a policy file, or
2) by signing the applet
So, to answer your question:
My question is this: why is needed a policy file to add a provider and not to open a ServerSoket or read/write a file???????Since the applet is signed, there is no need for a policy file......if you tried to access the socket without signing the applet, you'll get the security exception!
;o)
V.V.

A somewhat simple security question......

If a mac running macosx has two separate user accounts, lets say one admin and the other a standard user, or both admins or both standard users.....
Is it possible for a hacked/penetrated account on one of the users to affect or read any info from the other user on the same machine ?
What application is in question; Safari lets say.....

FLUIDNYC wrote:
So, disable all scripts and uninstall all plugins from the browser.
No java, No javascript, No plugins like flash, java, shockwave, quicktime, or adobe crap.
So, no functionality. What about that java applet I need to run 10 hours a day. Do you think I should go out of business over it? Or all my QT movies? Or, deprive myself of Flash, so I can't view the content of websites?
So, lets say you browse www.thissiteisinfected.com and have everything uninstalled (see above), and your smart enough to browse the web using a "STANDARD" user account and not the "ADMIN" user account.
Running from a standard user buys you nothing and adds additional steps. If you want to download an app, before you install, you will get a dialog warn you "XXXX is an application you downloaded from the internet..." So, you still have to authenticate. And what about *all the apps that need no authentication to install?*
You tell me how this website will inject crap into your MAC with the settings above???
There is no way to FORCE CODE into your browser if everything is disabled.
Tell me how it can "inject crap" into my "Mac" admin without my complicity.
I have bumped into a rouge antivirus website while on my macbook using safari.
All of a sudden a popup stated i had spyware, i could'nt close the box/window, I had to do a FORCE QUIT on SAFARI to get out of that page. It pretty much hijacked SAFARI.
This is nothing that can harm you. It is annoying having to force quit over it, but that is all.
My safari download settings place things on my desktop, sure enuff, there was a .EXE file sitting on my macbooks desktop.
Sure enough, your Mac can't do a thing with it.
NOTHING IS BULLETPROOF.
I agree but there are simpler ways to plant a rootkit you overlook, that have nothing to do admin accounts or ports. *The question is, who would want to?* Even if a black hat is randomly hunting for bank account numbers, social security numbers, credit card numbers, etc. he would pass up a UNIX based system with good protections in place for an easier target.
In short, in a home environment, I could never recommend running from a standard user. Especially if they are on a router and/or using OS X firewall. (The exception being if you have kids and want to use parental controls.) I have no idea how this mantra about using a non-admin account started, there is no place where Apple recommends this.
-mj

Simple Query Question - How do I return the Last 3 records of a Table?

Question.
For example, I have a table that has 50 records.
How do I, specify in SQL to only return the last 3 records of the table.
Select a.* from table a where ????

I was just trying to show an example to a friend on
how something like this would work and if it was even possible. But it won't work. Here's a simple example:
SQL> create table emp
2 (id)
3 as
4 select object_id
5 from   all_objects
6 order by object_id;
Table created.
SQL> select *
2 from (select rownum rn
3               ,b.*
4         from   emp b)
5 where rn > ( select (max(rownum) - 3)
6                from    emp)
7 ;
        RN         ID
     40830      55891
     40831      55892
     40832      55893So far, so good. These are the "last 3" rows inserted. Now delete a bunch of rows and insert 3 new ones:
SQL> delete emp where id < 40000;
33423 rows deleted.
SQL> commit;
Commit complete.
SQL> insert into emp values (60000);
1 row created.
SQL> insert into emp values (60001);
1 row created.
SQL> insert into emp values (60002);
1 row created.
SQL> commit;
Commit complete.
SQL> select *
2 from (select rownum rn
3               ,b.*
4         from   emp b)
5 where rn > ( select (max(rownum) - 3)
6                from    emp)
7 ;
        RN         ID
      7410      55891
      7411      55892
      7412      55893Here's the problem. Even though the "last 3 rows" are 60000 - 60002, I still get the same ones as the first query.

Simple RAID question

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