Need help in shutdown primary for maintaince (new to oracle dba)
Hi,
BANNER
Oracle9i Enterprise Edition Release 9.2.0.4.0 - Production
PL/SQL Release 9.2.0.4.0 - Production
CORE 9.2.0.3.0 Production
TNS for Linux: Version 9.2.0.4.0 - Production
NLSRTL Version 9.2.0.4.0 - Production
actually we have primary database server and the physical standby server with protection mode is maxperformance and for maintaince we need to shutdown primary server so what are the steps i need to follow since my primary database is configured with DATAGAURD and i would like to follow the folllowing steps please advice me:
to shutdown standby server:
from primary server connecting to dgmgrl
dgmgrl>DISABLE SITE standby_site1;
then connecting to standby server
sql>alter database recover managed standby database cancel;
sql>shu immediate;
and finnaly connecting to primary server
sql>shu immediate
is it right since i am new to datagaurd concept need help.
Regards
Prakash
You can do so, but you would shutdown the whole standby environment. But normally standby is used to have no or only short downtime. So a switchover to the standby DB is performed (after this standby is now running as primary), maintenance is done on the primary and then at the end another switchover back from the 'new' primary to the 'old' primary.
Werner
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Here is the project's specifications that I need to do"
"""Create a console calculator applicaion that:
* Takes one command line argument: your name and surname. When the
program starts, display the date and time with a welcome message for the
user.
* Display all the available options to the user. Your calculator must include
the arithmetic operations as well as at least five scientific operations of the
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* Include sufficient error checking in your program to ensure that the user
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* Your program must be able to do conversions between decimal, octal and
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* Make use of a menu. You should give the user the option to end the
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* When the program exits, display a message for the user, stating the
current time, and calculate and display how long the user used your
program.
* Make use of helper classes where possible.
* Use the SDK to run your program."""
When the program starts, it asks the user for his/her name and surname. I got the program to ask the user again and again for his/her name and surname
when he/she doesn't insert anything or just press 'enter', but if the user enters a number for the name and surname part, the program continues.
Now my question is this: How can I restrict the user to only enter 'letters' (and spaces of course) but allow NO numbers for his/her surname??
Here is the programs code that I've written so far:
{code}
import java.io.*;
import java.util.*;
import java.text.*;
public class Project {
private static String nameSurname = "";
private static String num1 = null;
private static String num2 = null;
private static String choice1 = null;
private static double answer = 0;
private static String more;
public double Add() {
answer = (Double.parseDouble(num1) + Double.parseDouble(num2));
return answer;
public double Subtract() {
answer = (Double.parseDouble(num1) - Double.parseDouble(num2));
return answer;
public double Multiply() {
answer = (Double.parseDouble(num1) * Double.parseDouble(num2));
return answer;
public double Divide() {
answer = (Double.parseDouble(num1) / Double.parseDouble(num2));
return answer;
public double Modulus() {
answer = (Double.parseDouble(num1) % Double.parseDouble(num2));
return answer;
public double maximumValue() {
answer = (Math.max(Double.parseDouble(num1), Double.parseDouble(num2)));
return answer;
public double minimumValue() {
answer = (Math.min(Double.parseDouble(num1), Double.parseDouble(num2)));
return answer;
public double absoluteNumber1() {
answer = (Math.abs(Double.parseDouble(num1)));
return answer;
public double absoluteNumber2() {
answer = (Math.abs(Double.parseDouble(num2)));
return answer;
public double Squareroot1() {
answer = (Math.sqrt(Double.parseDouble(num1)));
return answer;
public double Squareroot2() {
answer = (Math.sqrt(Double.parseDouble(num2)));
return answer;
public static String octalEquivalent1() {
int iNum1 = Integer.parseInt(num1);
String octal1 = Integer.toOctalString(iNum1);
return octal1;
public static String octalEquivalent2() {
int iNum2 = Integer.parseInt(num2);
String octal2 = Integer.toOctalString(iNum2);
return octal2;
public static String hexadecimalEquivalent1() {
int iNum1 = Integer.parseInt(num1);
String hex1 = Integer.toHexString(iNum1);
return hex1;
public static String hexadecimalEquivalent2() {
int iNum2 = Integer.parseInt(num2);
String hex2 = Integer.toHexString(iNum2);
return hex2;
public double Round1() {
answer = Math.round(Double.parseDouble(num1));
return answer;
public double Round2() {
answer = Math.round(Double.parseDouble(num2));
return answer;
SimpleDateFormat format1 = new SimpleDateFormat("EEEE, dd MMMM yyyy");
Date now = new Date();
SimpleDateFormat format2 = new SimpleDateFormat("hh:mm a");
static Date timeIn = new Date();
public static long programRuntime() {
Date timeInD = timeIn;
long timeOutD = System.currentTimeMillis();
long msec = timeOutD - timeInD.getTime();
float timeHours = msec / 1000;
return (long) timeHours;
DecimalFormat decimals = new DecimalFormat("#0.00");
public String insertNameAndSurname() throws IOException{
boolean inputCorrect = false;
while (inputCorrect == false) {
while (nameSurname == null || nameSurname.length() == 0) {
for (int i = 0; i < nameSurname.length(); i++) {
if ((nameSurname.charAt(i) > 'a') && (nameSurname.charAt(i) < 'Z')){
inputCorrect = true;
else{
inputCorrect = false;
break;
try {
BufferedReader inStream = new BufferedReader (new InputStreamReader(System.in));
System.out.print("Please enter your name and surname: ");
nameSurname = inStream.readLine();
inputCorrect = true;
}catch (IOException ex) {
System.out.println("You did not enter your name and surname, " + nameSurname + " is not a name, please enter your name and surname :");
inputCorrect = false;
System.out.println("\nA warm welcome " + nameSurname + " ,todays date is: " + format1.format(now));
System.out.println("and the time is now exactly " + format2.format(timeIn) + ".");
return nameSurname;
public String inputNumber1() throws IOException {
boolean inputCorrect = false;
while (inputCorrect == false) {
try {
BufferedReader br = new BufferedReader (new InputStreamReader(System.in));
System.out.print("\nPlease enter a number you want to do a calculation with and hit <ENTER>: ");
num1 = br.readLine();
double number1 = Double.parseDouble(num1);
System.out.println("\nThe number you have entered is: " + number1);
inputCorrect = true;
} catch (NumberFormatException nfe) {
System.out.println("\nYou did not enter a valid number: " + "\""+ num1 + "\" is not a number!!");
inputCorrect = false;
return num1;
public String calculatorChoice() throws IOException {
System.out.println("Please select an option of what you would like to do with this number from the menu below and hit <ENTER>: ");
System.out.println("\n*********************************************");
System.out.println("---------------------------------------------");
System.out.println("Please select an option from the list below: ");
System.out.println("---------------------------------------------");
System.out.println("1 - Add");
System.out.println("2 - Subtract");
System.out.println("3 - Multiply");
System.out.println("4 - Divide (remainder included)");
System.out.println("5 - Maximum and minimum value of two numbers");
System.out.println("6 - Squareroot");
System.out.println("7 - Absolute value of numbers");
System.out.println("8 - Octal and Hexadecimal equivalent of numbers");
System.out.println("9 - Round numbers");
System.out.println("0 - Exit program");
System.out.println("**********************************************");
boolean inputCorrect = false;
while (inputCorrect == false) {
try {
BufferedReader inStream = new BufferedReader (new InputStreamReader(System.in));
System.out.print("Please enter your option and hit <ENTER>: ");
choice1 = inStream.readLine();
int c1 = Integer.parseInt(choice1);
System.out.println("\nYou have entered choice number: " + c1);
inputCorrect = true;
} catch (NumberFormatException nfe) {
System.out.println("You did not enter a valid choice number: " + "\""+ choice1 + "\" is not in the list!!");
inputCorrect = false;
return choice1;
public String inputNumber2() throws IOException {
boolean inputCorrect = false;
while (inputCorrect == false) {
try {
BufferedReader br2 = new BufferedReader (new InputStreamReader(System.in));
System.out.print("\nPlease enter another number you want to do the calculation with and hit <ENTER>: ");
num2 = br2.readLine();
double n2 = Double.parseDouble(num2);
System.out.println("\nThe second number you have entered is: " + n2);
System.out.println("\nYour numbers are: " + num1 + " and " + num2);
inputCorrect = true;
} catch (NumberFormatException nfe) {
System.out.println("You did not enter a valid number: " + "\""+ num2 + "\" is not a number!!");
inputCorrect = false;
return num2;
public int Calculator() {
int choice2 = (int) Double.parseDouble(choice1);
switch (choice2) {
case 1 :
Add();
System.out.print("The answer of " + num1 + " + " + num2 + " is: " + decimals.format(answer));
break;
case 2 :
Subtract();
System.out.print("The answer of " + num1 + " - " + num2 + " is: " + decimals.format(answer));
break;
case 3 :
Multiply();
System.out.print("The answer of " + num1 + " * " + num2 + " is: " + decimals.format(answer));
break;
case 4 :
Divide();
System.out.print("The answer of " + num1 + " / " + num2 + " is: " + decimals.format(answer));
Modulus();
System.out.print(" and the remainder is " + decimals.format(answer));
break;
case 5 :
maximumValue();
System.out.println("The maximum number between the numbers " + num1 + " and " + num2 + " is: " + decimals.format(answer));
minimumValue();
System.out.println("The minimum number between the numbers " + num1 + " and " + num2 + " is: " + decimals.format(answer));
break;
case 6 :
Squareroot1();
System.out.println("The squareroot of value " + num1 + " is: " + decimals.format(answer));
Squareroot2();
System.out.println("The squareroot of value " + num2 + " is: " + decimals.format(answer));
break;
case 7 :
absoluteNumber1();
System.out.println("The absolute number of " + num1 + " is: " + decimals.format(answer));
absoluteNumber2();
System.out.println("The absolute number of " + num2 + " is: " + decimals.format(answer));
break;
case 8 :
octalEquivalent1();
System.out.println("The octal equivalent of " + num1 + " is: " + octalEquivalent1());
octalEquivalent2();
System.out.println("The octal equivalent of " + num2 + " is: " + octalEquivalent2());
hexadecimalEquivalent1();
System.out.println("\nThe hexadecimal equivalent of " + num1 + " is: " + hexadecimalEquivalent1());
hexadecimalEquivalent2();
System.out.println("The hexadecimal equivalent of " + num2 + " is: " + hexadecimalEquivalent2());
break;
case 9 :
Round1();
System.out.println("The rounded number of " + num1 + " is: " + decimals.format(answer));
Round2();
System.out.println("The rounded number of " + num2 + " is: " + decimals.format(answer));
break;
case 0 :
if (choice2 == 0) {
System.exit(1);
break;
return choice2;
public String anotherCalculation() throws IOException {
boolean inputCorrect = false;
while (inputCorrect == false) {
try {
BufferedReader br3 = new BufferedReader (new InputStreamReader(System.in));
System.out.print("\nWould you like to do another calculation? Y/N ");
more = br3.readLine();
String s1 = "y";
String s2 = "Y";
if (more.equals(s1) || more.equals(s2)) {
inputCorrect = true;
while (inputCorrect = true){
inputNumber1();
System.out.println("");
calculatorChoice();
System.out.println("");
inputNumber2();
System.out.println("");
Calculator();
System.out.println("");
anotherCalculation();
System.out.println("");
inputCorrect = true;
} else {
System.out.println("\n" + nameSurname + " thank you for using this program, you have used this program for: " + decimals.format(programRuntime()) + " seconds");
System.out.println("the program will now exit, Goodbye.");
System.exit(0);
} catch (IOException ex){
System.out.println("You did not enter a valid answer: " + "\""+ more + "\" is not in the list!!");
inputCorrect = false;
return more;
public static void main(String[] args) throws IOException {
Project p1 = new Project();
p1.insertNameAndSurname();
System.out.println("");
p1.inputNumber1();
System.out.println("");
p1.calculatorChoice();
System.out.println("");
p1.inputNumber2();
System.out.println("");
p1.Calculator();
System.out.println("");
p1.anotherCalculation();
System.out.println("");
{code}
*Can you please run my code for yourself and have a look at how this program is constructed*
*and give me ANY feedback on how I can better this code(program) or if I've done anything wrong from your point of view.*
Your help will be much appreciated.
Thanks in advanceSmirre wrote:
Now my question is this: How can I restrict the user to only enter 'letters' (and spaces of course) but allow NO numbers for his/her surname??You cannot restrict the user. It is a sad fact in programming that the worst bug always sits in front of the Computer.
What you could do is checking the input string for numbers. If it contains numbers, just reprompt for the Name.
AND you might want to ask yourself why the heck a calculator needs to know the users Name. -
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would I be hindering general editing performance in any way? Or does
this option have basically zero drawbacks?
It takes a small but nonzero time for the background processes to start up when they need to be used and shut down when they're done. And as they sit waiting, they take up a little bit of memory. So, it's not exactly correct to say that there are no downsides to leaving it on. But it's close. I leave it on.
> 2) How come “Actual CPUs that will be used” will read 0 even
if the sum total of RAM assigned to the CPUs plus the RAM reserved for
other applications is less than the total available system RAM (on a
64bit system)? For example, I currently have 4GB RAM and 2 installed
CPUs. I have 1.5GB reserved for other programs and when I set 0.75GB per
CPU both CPUs are used. However when I set 1GB per CPU then 0 CPUs are
used, even though the total RAM adds up to only 3.5GB.
4GB - 1.5GB for other software leaves 2.5 GB for After Effects.
If you have 1GB assigned per background CPU, then the foreground takes 1.2x that = 1.2GB. That leaves 1.3GB for background processes, which is enough for one background process. There's no point in starting only one background process to do rendering, so it doesn't bother. (Note: When background processes are rendering, the foreground process isn't rendering.)
> 3.) Considering the fact that I am more concerned with
smooth performance while editing rather than final output speeds, would
it be better to get a dual core i5 clocked around 2.5 or a quad core i7
clocked around 1.8?
Get the quad-core. That gives you a greater total number of cycles. And After Effects works very well with mutliple processors, even beyond Render Multiple Frames Simultaneously multiprocessing. An entirely unrelated sort of multiprocessing (multithreading) spreads work out to multiple processors.
> 6.) Should the quantity of RAM that I get (8GB vs 12GB) be based on the number of cores in my CPU? If
so, how should I be calculating optimal RAM based on # of cores. Should
I also be counting threads, or just actual physical cores?
The optimum amount is the amount that you can cram into the computer. I'm not kidding. Spend your budget on RAM until you have 4GB installed per processor (and I'm counting the virtual processors due to hyperthreading). If you have a quad-core, that's 8 CPUs with hyperthreading, so the optimum amount of RAM installed is 32GB. You can work with less, but you did ask about optimum. For HD work (i.e., 1920 pixels across), you're OK with more like 3GB installed per CPU. That's what I have at home: 24GB in a quad-core. You're going to assign 2/3 or so of the RAM to After Effects, so 3GB installed per CPU is 2GB per core for HD work in After Effects.
> 10.) Would it be better to have 8GB of RAM and an SSD, or 12GB of RAM and an HDD? Explain why.
12GB of RAM. Because After Effects likes RAM. (If you're thinking of deliberatly using virtual memory to swap memory to the hard disk, don't. That's a performance killer.)
> 10.) After Effects utilizes OpenGL to enhance editing performance.
Not really. If you're on a limited budget, don't even think about the GPU until you've already got the most RAM, the fastest CPUs, the largest number of CPUs, two fast hard disks, and a couple of good monitors. Then, and only then, should you even consider getting soemthing beyond a non-stock graphics card. Yes, OpenGL can be used to accelerate some things, but that's only for the low-fidelity preview renderer. (Pardon the bluntness, but I want to make sure that you heed this.)
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