Urgent: Question DBWn & LGWR

I have some question regarding oracle database architecture. Reply me as soon as possible i have exams ahead!!!!!
Q1 DBWR Process writes dirty bufers to Data files. Consider a situation in which DBWR writes uncommitted data to data files and instance then crashes then how its
recovery will happen next time when instance starts?
Q2 LGRW write log entries to Log files..similarly if LGRW writes uncommited redo log entries to redo log files and then instnce crashes what will happen?
Q3 How SCN is tackled at instance recovery procedure? means how SCN help identify creeps?
Q4 How at instance recovery phase oracle db come to know that data in data files belongs to uncommitted transaction thus needs to be undo, and these redo log entries in redo log files are part of committed transaction so the must be rolled forward.

Yes, it is possible that there are changes present in the redo log that are not reflected in the datafiles. That's OK, because Oracle does not necessarily write to the datafile at commit time. Oracle knows what Redo entries need to be applied to the datafiles because the Control File has record of the last checkpoint position in the Redo log. From this, it knows that all Redo entries before that checkpoint time need not be reapplied to the datafiles, because checkpoint means it was written to disk.
So, at recovery time, Oracle may need to reflect into the datafiles those changes found in the log. This is called rolling forward.
And yes, it is also possible that there are changes in the data files that have not yet been committed. (This is because Oracle goes ahead and makes the changes to blocks (and datafiles, if checkpointed) even though they've not been committed, and relies on the Undo data to undo these if another session reads the data). Uncommitted changed may also be introduced during the roll-forward step just done. So, during instance recovery, these uncommitted changes are rolled back. Picture it as Oracle replaying what's been recorded persistently (on disk) before the crash. The control file knows the last checkpoint, and starts there, looking in the redo log. It applies all changes it finds there (and some of these changes actually apply to the Undo ts). Now it's applied changes that should have been recorded in the datafiles but had not yet gotten a chance to, and also some changes that had gotten written to the datafile, but was never committed. So, then it issues a rollback for each uncommitted transaction, undoing anything that was never committed.
Keep in mind that the definition of a transaction being committed is that it has been assigned an SCN, which has been recorded in the Online Redo Log File, AND all the Redo to represent that change has also been written to the Online Redo Log File. I.E. in sqlplus, when you type "commit", control is not returned to you until these 2 things have happened.
This looks verbose at first, but it really does make sense. Take a look at the online docs... the Concepts, Backup /Recovery, and the Admin Guide - search for recovery, scn, etc.
Tom Best

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From 11.2 Database Concepts Guiide's, LGWR section
-- not italicizing for readability
Before DBWn can write a dirty buffer, redo records associated with changes to the buffer must be written to disk (the write-ahead protocol). If DBWn finds that some redo records have
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spiral wrote:
From 11.2 Database Concepts Guiide's, LGWR section
-- not italicizing for readability
Before DBWn can write a dirty buffer, redo records associated with changes to the buffer must be written to disk (the write-ahead protocol). If DBWn finds that some redo records have
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Please don't mark your questions urgent, as it's not urgent for us.
Where I work, we have a final public class SomeClass,
which has hundreds of private static methods inside.
I need to find a way to re-factor that class, to
divide it into smaller classes, and to divide the
methods of SomeClass between the new smaller
classes.
I don't want to change any of the code that is
calling methods from SomeClass, because that will be
huge amount of work.If they're private methods, then they are presumably called only from inside the class. You can refactor them and move them wherever you wish without having to change anything that is outside that class.

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Urgent question about Thread-safety

Hi all,
the new tiger release provides an "isReachable()" method for the "InetAddress" object.
I've found, this method is not thread-safe (see the source and output below).
It returns true for all threads, when multiple threads using this method with different adresses are running at a time and one of the addresses is reachable. This happens only on WinXp. Running on Linux, the output is like expected.
I've tried to report this as a bug. But the gurus answered, taking care of thread safety would be a "programmers task".
My question is, what can I do, to be thread-safe in my case?
W.U.
import java.util.*;
import java.net.*;
public class IsReachableTest_1 extends Thread{
    static volatile int inst=1;
    static final String NET_ADDR="192.168.111.";
    int instance=inst++;
    public void run(){
        for(int i=19;i<23;i++){
            try{
                long start=System.nanoTime();
                if(InetAddress.getByName(NET_ADDR+i).isReachable(1000))
                    System.out.println(""+instance+"--host found at:"+NET_ADDR+i+"--time:"+(System.nanoTime()-start)/1000000);
                else
                    System.out.println(""+instance+"--no host at:"+NET_ADDR+i);
            }catch(Exception e){System.out.println(""+instance+"--ERROR "+e.toString());}
        System.out.println(""+instance+"--done.");
    public static void main(String[] args) {
        System.out.println(
            System.getProperty("java.vendor")+" "+
            System.getProperty("java.version")+" running on "+
            System.getProperty("os.name")+" "+
            System.getProperty("os.version"));
        Vector v=new Vector();
        System.out.println("\nTest 1: One after another:");
        for(int i=0;i<10;i++){
            IsReachableTest_1 t;
            t=new IsReachableTest_1();
            t.start();
            try{
                t.join();
            }catch(Exception e){System.out.println("MAIN1: "+e.toString());}
        System.out.println("\nTest 2: All together:");
        inst=1;
        for(int i=0;i<10;i++){
            IsReachableTest_1 t;
            t=new IsReachableTest_1();
            t.start();
            v.addElement(t);
        for(Iterator i=v.iterator();i.hasNext();)
            try{
                ((IsReachableTest_1)i.next()).join();
            }catch(Exception e){System.out.println("MAIN2: "+e.toString());}
            System.out.println("\nALL DONE");
And here is the output, when running on WinXp:
Sun Microsystems Inc. 1.5.0-beta running on Windows XP 5.1
Test 1: One after another:
1--no host at:192.168.111.19
1--no host at:192.168.111.20
1--host found at:192.168.111.21--time:2
1--no host at:192.168.111.22
1--done.
2--no host at:192.168.111.19
2--no host at:192.168.111.20
2--host found at:192.168.111.21--time:4
2--no host at:192.168.111.22
2--done.
3--no host at:192.168.111.19
3--no host at:192.168.111.20
3--host found at:192.168.111.21--time:1
3--no host at:192.168.111.22
3--done.
4--no host at:192.168.111.19
4--no host at:192.168.111.20
4--host found at:192.168.111.21--time:1
4--no host at:192.168.111.22
4--done.
5--no host at:192.168.111.19
5--no host at:192.168.111.20
5--host found at:192.168.111.21--time:3
5--no host at:192.168.111.22
5--done.
6--no host at:192.168.111.19
6--no host at:192.168.111.20
6--host found at:192.168.111.21--time:1
6--no host at:192.168.111.22
6--done.
7--no host at:192.168.111.19
7--no host at:192.168.111.20
7--host found at:192.168.111.21--time:1
7--no host at:192.168.111.22
7--done.
8--no host at:192.168.111.19
8--no host at:192.168.111.20
8--host found at:192.168.111.21--time:1
8--no host at:192.168.111.22
8--done.
9--no host at:192.168.111.19
9--no host at:192.168.111.20
9--host found at:192.168.111.21--time:1
9--no host at:192.168.111.22
9--done.
10--no host at:192.168.111.19
10--no host at:192.168.111.20
10--host found at:192.168.111.21--time:1
10--no host at:192.168.111.22
10--done.
Test 2: All together:
1--no host at:192.168.111.19
2--no host at:192.168.111.19
3--no host at:192.168.111.19
4--no host at:192.168.111.19
5--no host at:192.168.111.19
6--no host at:192.168.111.19
7--no host at:192.168.111.19
8--no host at:192.168.111.19
9--no host at:192.168.111.19
10--no host at:192.168.111.19
2--no host at:192.168.111.20
3--no host at:192.168.111.20
6--host found at:192.168.111.20--time:924 <----- this host does not exist!!
5--host found at:192.168.111.20--time:961 <----- this host does not exist!!
10--host found at:192.168.111.20--time:778 <----- this host does not exist!!
9--host found at:192.168.111.20--time:815 <----- this host does not exist!!
2--host found at:192.168.111.21--time:37
7--host found at:192.168.111.20--time:888 <----- this host does not exist!!
8--host found at:192.168.111.20--time:852 <----- this host does not exist!!
4--host found at:192.168.111.20--time:997 <----- this host does not exist!!
1--host found at:192.168.111.20--time:1107 <----- this host does not exist!!
3--host found at:192.168.111.21--time:38
6--host found at:192.168.111.21--time:1
5--host found at:192.168.111.21--time:1
10--host found at:192.168.111.21--time:2
2--host found at:192.168.111.22--time:3 <----- this host does not exist!!
9--host found at:192.168.111.21--time:2
7--host found at:192.168.111.21--time:1
4--host found at:192.168.111.21--time:3
1--host found at:192.168.111.21--time:39
2--done.
1--host found at:192.168.111.22--time:5 <----- this host does not exist!!
1--done.
10--host found at:192.168.111.22--time:40 <----- this host does not exist!!
3--host found at:192.168.111.22--time:192 <----- this host does not exist!!
6--host found at:192.168.111.22--time:75 <----- this host does not exist!!
8--host found at:192.168.111.21--time:230
5--host found at:192.168.111.22--time:155 <----- this host does not exist!!
4--host found at:192.168.111.22--time:78 <----- this host does not exist!!
9--host found at:192.168.111.22--time:77 <----- this host does not exist!!
7--host found at:192.168.111.22--time:76 <----- this host does not exist!!
10--done.
6--done.
4--done.
5--done.
3--done.
7--done.
9--done.
8--no host at:192.168.111.22
8--done.
ALL DONE

I created this test (it's basically the same as your class):
import java.util.*;
import java.net.*;
public class IsReachableTest_2 implements Runnable {
    private final String[] addresses = new String[] {
         "www.sun.com",
         "129.42.16.99" // www.ibm.com which is not reachable
    public void run(){
        try {
            for (int i = 0; i < addresses.length; i++) {
                final long start = System.nanoTime();
                final String address = addresses;
     if (InetAddress.getByName(address).isReachable(5000)) {
     System.out.println(Thread.currentThread().getName() + ": Host found at: " + address +
          " --time: " + (System.nanoTime() - start) / 1000);
     } else System.out.println("no host at: " + address);
} catch(Exception e){
e.printStackTrace();
System.out.println("Thread " + Thread.currentThread().getName() + " DONE");
public static void main(String[] args) {
System.out.println(
     System.getProperty("java.vendor") +
     " " +
     System.getProperty("java.version") +
     " running on " +
     System.getProperty("os.name") +
     " " +
     System.getProperty("os.version")
for (int i = 0; i < 10; i++) {
     final Thread t = new Thread(new IsReachableTest_2(), "THREAD " + (i+1));
     t.start();
And I get:
Sun Microsystems Inc. 1.5.0-beta running on Windows 2000 5.0
THREAD 1: Host found at: www.sun.com --time: 217653
THREAD 3: Host found at: www.sun.com --time: 214404
THREAD 6: Host found at: www.sun.com --time: 214900
THREAD 4: Host found at: www.sun.com --time: 215901
THREAD 5: Host found at: www.sun.com --time: 216666
THREAD 10: Host found at: www.sun.com --time: 216620
THREAD 9: Host found at: www.sun.com --time: 217405
THREAD 2: Host found at: www.sun.com --time: 220705
THREAD 7: Host found at: www.sun.com --time: 220845
THREAD 8: Host found at: www.sun.com --time: 221384
no host at: 129.42.16.99
Thread THREAD 4 DONE
no host at: 129.42.16.99
Thread THREAD 6 DONE
no host at: 129.42.16.99
no host at: 129.42.16.99
no host at: 129.42.16.99
no host at: 129.42.16.99
no host at: 129.42.16.99
no host at: 129.42.16.99
no host at: 129.42.16.99
no host at: 129.42.16.99
Thread THREAD 5 DONE
Thread THREAD 10 DONE
Thread THREAD 9 DONE
Thread THREAD 7 DONE
Thread THREAD 3 DONE
Thread THREAD 1 DONE
Thread THREAD 2 DONE
Thread THREAD 8 DONE
HOWEVER: I was getting some strange results every so often. Results like:
Sun Microsystems Inc. 1.5.0-beta running on Windows 2000 5.0
THREAD 3: Host found at: www.sun.com --time: 261132
THREAD 9: Host found at: www.sun.com --time: 264183
THREAD 2: Host found at: www.sun.com --time: 266447
THREAD 6: Host found at: www.sun.com --time: 266596
THREAD 8: Host found at: www.sun.com --time: 267192
THREAD 5: Host found at: www.sun.com --time: 268610
THREAD 4: Host found at: www.sun.com --time: 269849
THREAD 1: Host found at: www.sun.com --time: 280978
THREAD 7: Host found at: www.sun.com --time: 272589
THREAD 10: Host found at: www.sun.com --time: 273162
THREAD 3: Host found at: 129.42.16.99 --time: 13657
Thread THREAD 3 DONE
THREAD 4: Host found at: 129.42.16.99 --time: 4123
THREAD 2: Host found at: 129.42.16.99 --time: 9439
THREAD 5: Host found at: 129.42.16.99 --time: 6681
THREAD 8: Host found at: 129.42.16.99 --time: 7655
THREAD 6: Host found at: 129.42.16.99 --time: 8627
THREAD 9: Host found at: 129.42.16.99 --time: 10586
Thread THREAD 4 DONE
Thread THREAD 2 DONE
Thread THREAD 5 DONE
Thread THREAD 8 DONE
Thread THREAD 6 DONE
Thread THREAD 9 DONE
no host at: 129.42.16.99
Thread THREAD 7 DONE
no host at: 129.42.16.99
no host at: 129.42.16.99
Thread THREAD 10 DONE
Thread THREAD 1 DONE
Usually the first run after I had compiled the class (!?) This isn't a thread safety problem.

URGENT QUESTION concerning Pavilion DV6 laptop charger

Hey I have a question: I have two HP laptops; one is the Pavilion dv6 and has a charger with the series number PPP009L-E, with input 1.6A and 65W;
The other laptop is the Pavilion dv6-3236NR, with the charger having the series number PPP009D, with input 1.7A and 65W.
My question is, can I use the second charger for the first charger's laptop? My first Pavilion dv6 won't charge at all! Could someone PLEASE help me ASAP and tell me if it's the charger's problem, battery problem, or both, and whether I could use the second charger on the laptop!

Hi Sekhar,
Well the error code would certainly indicate that the drive has started to fail, but just in case, you could try wiping the entire Hard Drive first and then reinstalling the Operating System as described below.
Download and install Killdisk on the link below - ( this application will write zeros to the entire drive ).
http://software.lsoft.net/KillDiskSuiteFree-Setup.exe
Download and install ImgBurn on the link below.
http://download.cnet.com/ImgBurn/3000-2646_4-10847481.html
Go to the Kill Disk application you have installed in All Programs, open the main folder, then select Bootable Disk creators and from that select Bootable DOS CD Creator which will burn the bootable ISO to a blank CD.
During the next process do not worry about any warnings as your Windows 7 installation disc will reformat the HDD.
Insert this CD in to your PC that is unable to load Operating System properly. Shut the notebook down, then start it again to boot from the Killdisk CD and follow the on screen instructions for Kill Disk.
A brief description of the process is here Killdisk.
Use this to wipe the whole of the Hard Drive, highlight (80h) and press f10 ( you will also have to type a confirmation and hit enter ) - ( this will make sure you include all partitions and then start the process - this may take a couple of hours! ).
When the process is complete, remove the Killdisk CD and try installing Windows 7 again.
If it still fails, I think your only option is to replace the HDD.
Regards,
DP-K
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Microsoft MVP - Windows Experience

Urgent: Question DBWn & LGWR

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