Can start method invoke twice at one instance

I am using JBoss and writing a class which extends Thead. I would like to ask can I invoke start() method twice to an instance of that class. I've tried it but it seems that the object did nothing when start() method is invoked at the second time.

Any Thread can only be start()ed once.
Also, prefer implementing Runnable to extending Thread. Think of Threads as the workers and Runnables as the job itself. You implement Runnable because your "unit of work" or whatever you want to call it IS-A Runnable -- that is, something that will do its job start-to-finish when you call run. You would only extend Thread if your class IS-A Thread -- that is, it has a reason to do everything Thread does, and you need to slightly add to or modify Thread's behavior.

Similar Messages

Can a method return more than one value?

I was studying for my biology exam and I got bored and I started thinking and then I wandered if a method can return more than one value...?
For example, if I want a method to return a row a column, I make a method that returns an int. But what if I want to return two ints? Or what If I want to return an integer and a string? Is it possible or do I have make two methods, each returning one thing?
What I always did until now is is I want for example to return a few integers, I would store them in a String and then when I return the string, I parse the numbers out using stringtokenizer... but it doesn't look like the best way... and it's pretty annoying...

I'm weak on terminology, hence I don't even know what
AFAIK means...As Far As I Know
This doesn't really make sense for me. It's more
efficient to make a whole class just for two
integers, than having two methods? Efficiency is not the point. The flow is.
If you have two methods, the caller must be aware of both of them. The other way it's up to the callee.
Just because the
two integers are related to each other? Doesn't
making a class require more memory usage than just
making two one-line methods?The memory usage is not wholly irrelevant, but there are ways to handle that (caching, inlining, etc.).
It's a bit hard to counter your point for me, but if you had done a lot of GUI painting stuff, you'd see all those Points, Dimensions, Rectangles, you name it, are quite invaluable.

Can you run iTunes twice on one computer? Run two libraries on one compute

My roommate and I both have iPods and share a computer but we have vastly different tastes in music. How can we both have our own iTunes libraries on one computer?

There are a couple of ways you can do this, have a look at this guide: "How to use multiple iPods with one computer" http://docs.info.apple.com/article.html?artnum=300432

Can you not use more than one instance of Safari at a time

I can't use my IE browser because of problems in my other post.
I also need to have multiple windows or browser sessions open at once and Safari will only seem to open one session at a time.
Is this the case?
How do I get around it?
If I open Safari, and click the Safari icon again it just sits there and won't open another session.
Thanks,
Tom

Between "New window" and "New Tab," the tab is the way to go for the needs I believe you are expressing. However, tabbed browsing may not be enabled by default.
To make the tab bar always visible--and therefore easily make new tabs by control-clicking the tab bar--open Safari Preferences. Select "Tabs" and, in that pref pane, select "Enable Tabbed Browsing" and "Always show tab bar." There are also some keyboard shortcuts shown there.

Process.Start(url) sometimes one instance fails

I need some help!!!
ASPX.NET/C#- Call Process.Start(url) several times, sometimes one instance fails without error!!
I have a program that calls a http aspx.net with arguments(URL) to execute some stuff. That program are invoking 10 times that aspx.net (all in the same time) with diferents urls.
But sometimes, one of the calls (url) do not launch in browser.
Code is very simple:
public partial class _Default : System.Web.UI.Page
private Object thisLock = new Object();
protected void Page_Load(object sender, EventArgs e)
try
string URL = Request.Params["URL"];
Logger.Log("CURRENT URL TO LAUNCH->", URL);
lock (thisLock)
ProcessStartInfo startInfo = new ProcessStartInfo("IExplore.exe");
startInfo.WindowStyle = ProcessWindowStyle.Maximized;
startInfo.Arguments = URL;
Process.Start(startInfo);
catch (Exception ex)
Logger.Log("Exception", ex);
}The URL launch are a client side technology!And that´s because i need to open the IE in WebServer!It´s silverlight web application to generate reports!The silverlight application closes the IE instances after finish. Everything goes right, except sometimes in 10 requests one fail
Thanks

What's the url do?
Is it possibly that the url isn't ready or there?
I can't recall ever doing process start from a web page.
Maybe there's an alternative way of approaching whatever you're trying to do.
BTW
I think you should probably ask this question in the asp.net forum since there's actually no Silverlight in the mix there
Hope that helps.
Recent Technet articles: Property List Editing;
Dynamic XAML

Can a method return multiple items

Can a method return more than one thing?
I want to have a method return a boolean and a String. My method is saying if something is right or wrong, then its saying the reason why.
help, please.
Thanx

Afternoon_Delight wrote:
My question is:
Is there a way so that it can be more like this:
public boolean, String checkValidity (){
To expand on the previous posts, one way (not saying it's the best one!) is to create an object that combines the information that you want returned:
public class MyValid
private boolean valid;
private String text;
public MyValid(boolean valid, String text)
    this.valid = valid;
    this.text = text;
public boolean isValid()
    return valid;
public String getText()
    return text;
class DoFoo
public MyValid checkValidity()
    return new MyValid(false, "Because I said so!");
}

One machine = One Instance

Hi there,
How can i prevent that more than one instance of my application from being created in the same machine. How can i rename the process associated to the application (instead of the usual javaw.exe)?
Thanks for any help you can give me,
Carlos Ferreira

When I was writing for Windows, we did this via global
Mutex objects. Your app (on startup) would attempt to
create and get ownership of a global named Mutex
(usually the App name). If you got ownership, you were
the only one running.
The problem here with Java is that you MIGHT be
running multiple JVMs. Without access to a machine
level Mutex, it is difficult to ensure One instance
per machine (that behaves well following a crashor
error).Um - you do realize that the suggested socket approach guarantees exactly this? I come up, and either I get the socket or I don't. If I fail - someone else is already running, exit. When I leave, or if I crash, the socket is automatically freed up for me.
(And, having had to debug poorly-written Windows Mutex code, I know that mutexes can be left in odd states if the holder falls over while holding them. It's easy to code to notice and deal with this - but if you fail to do so, then your app fails to run again, unless/until you reboot the machine.)
However, one could make use of JMS to simulate this.
Lots of overhead to set up the client and server ends
of this simply to ensure 1 application per machine,
but it should work. We do have to assume that the
application plays by the rules and attempts to
validate its one-ness prior to startup.Ow. JMS is a hugely-overcomplicated tool to use for this straightforward application.
And, regarding everyone "playing fair" - well, yeah, that's a given. But since what we're talking about here is two instances of the same program, then it pretty much by definition either plays the game, or it doesn't.
Grant

Can I launch more than one instance?

Can I launch more than one instance of the same AIR
application?

Check out page 309 of the AIR Dev Guide "Only one instance of
an AIR application is started. When an already running application
is invoked again, AIR dispatches a new invoke event to the running
instance. It is the responsibility of an AIR application to respond
to an invoke event and take the appropriate action (such as opening
a new document window)."
It looks like we have to handle this InvokeEvent.INVOKE event
and programatically create a new instance of the application.
If anyone's done this already an example would be a big help
as this will be a VERY common use case.

Can I create more than one instance of a native library?

Hello all,
I am using Java to access a Win32 DLL with JNI. Everything is working fine, but I have several threads using the same instance of the native library because it is loaded "statically" in the Java class which uses it, and I suspect I am getting a bottle-neck at the native library.
Does anyone know if there is any way to load more than one "instance" of a native library?
The use of System.loadLibrary() would indicate not, and my (limited) knowledge of the Windows environment would tell me that a "shared" library only has on instance. (confirm anyone?)
I need to find a way around this bottle-neck issue... (and "no", before anyone suggests it, I can't ditch Windows!)
Thanks.

I am not sure about the behaviour of the dll as it's not mine. It's a COM DLL which I have "wrapped" in a standard windows DLL so I can expose the JNI methods. I assume because it's COM that it IS reentrant, but I am a bit of a novice when it comes to Windows and COM. I didn't install the COMponent either, it was installed as part of another application. (It's an antivirus COM dll that is part of an AV application)
Thanks for your help though, I think I will just have to live with it.

Getting Error :- Only one instance of COBRAS Export can be running at a time

Hi All,
I was checking the Briefcase Mode help file and it mentions for Unity Conection
that COBRAS will run multiple instances of itself – if you schedule multiple backups to fire up at the same time they will all run at the same time.
However if I schedule multiple backups to fire at the same time then I get the error :- "Only one instance of COBRAS Export can be running at a time".
This also happens if the COBRAS windows is left open and the scheduled backup starts in the background.
http://www.ciscounitytools.com/Applications/General/COBRAS/Help/COBRAS_Briefcase/COBRAS_Briefcase.htm#_Toc276653845
I am not sure if I am making a mistake in understanding the statement :- "COBRAS will run multiple instances of itself – if you schedule multiple backups to fire up at the same time" or do we need to add any switch like lot of other application need like /m etc in the field of the scheduled backups as I see as /silent switch for process to run in background automatically but none for multiple instances.
I am attaching the screen shots of the errors I got when
A.) I scheduled 2 backups to run at the same time and the COBRAS application window was open "COBRASExportCUC7.exe" was running and no backup took place and got errors for both the scheduled backups.
And
B.) I scheduled 2 backups to run at the same time and the COBRAS application window was closed off and "COBRASExportCUC7.exe" was not running and one of the scheduled backups started to work and the other one gave error and didn't work
Unity Connection in use :- Version 8.0.3.20000-18
Cobras Export :- Version 1.0 Build 76
Please Suggest.
Regards,
Prad
(E-Mail :- [email protected])

Yeah, I’m of two minds on that – on the one hand it’s bad style to have a scheduled application popping dialog boxes (especially if you’re running as an account you don’t log in as regularly) – one the other hand I did have some sites go a while not noticing backups were failing (due to a UNC not flying any longer after a server reconfig) – folks can be bad about checking log files or the event log for issues. A pop up would pretty much guarantee they’d notice on next login at any rate.
I think I may stitch in email notifications in COBRAS Export in the same way they’re in the User Data Dump so failures of scheduled backups would be noticed right away (big, bright email in your box saying “failed!” would do it).
Either way, I’ll update the help and make sure it fails quietly for now when I update some other items on the site middle of next week.
Thanks for the report.

Can a Method listen to more than one event in ABAP OO ?

Hi,
is it possible to prepare/register a handler method for e.g two events of two different classes ?
Or can a method generally listen to only one event ?
It seems that the syntax allows only one event ?
methods event_handler for event my_event of my_class.
Thanks for help in advance
Olaf

An event can refer to more than one object but you have to instantiate the objects
for example   I have 2 grids and want to handle events depending on which grid
the user is selecting / requesting actions on. (I've just posted the relevant bits coded here as data extraction etc you can code normally).
FORM instantiate_grid
* Create Grid container
* Instantiate Grid class
* Instantiate Event Handler class
* Display the Grid
   USING grid_container TYPE REF TO cl_gui_custom_container
          class_object TYPE REF TO cl_gui_alv_grid
          container_name TYPE scrfname.
* create the container
CREATE OBJECT grid_container
EXPORTING container_name = container_name.
* Create the ALV grid object using
* container just created
CREATE OBJECT class_object
EXPORTING
     i_parent = grid_container.
* Exclude the SUM function from the GRID toolbar
ls_exclude = cl_gui_alv_grid=>mc_fc_sum.
APPEND ls_exclude TO lt_exclude.
* Instantiate our handler class
* lcl_event_handler
CALL METHOD class_object->register_edit_event
    EXPORTING
      i_event_id = cl_gui_alv_grid=>mc_evt_enter.
CREATE OBJECT g_handler.
SET HANDLER g_handler->handle_double_click FOR class_object.
SET HANDLER g_handler->handle_hotspot_click FOR class_object.
SET HANDLER g_handler->handle_toolbar FOR class_object.
SET HANDLER g_handler->handle_user_command FOR class_object.
SET HANDLER g_handler->handle_data_changed FOR class_object.
SET HANDLER g_handler->handle_data_changed_finished FOR class_object.
ENDFORM.                    "instantiate_grid
MODULE status_0100 OUTPUT.
IF grid_container IS INITIAL.
    PERFORM instantiate_grid
       USING grid_container
             grid1
             'CCONTAINER1'.
* Grid title Primary Grid
    struct_grid_lset-grid_title = 'Delimit Old org Units - Selection'.
    struct_grid_lset-edit = 'X'.
    struct_grid_lset-sel_mode = 'D'.
    PERFORM display_grid
     USING
        grid1
         <dyn_table>
         it_fldcat.
ENDIF.
SET PF-STATUS '001'.
SET TITLEBAR '000' WITH 'Delimit Old Org Units'.
ENDMODULE.                    "status_0100 OUTPUT
* PAI module
MODULE user_command_0100 INPUT.
CASE sy-ucomm.
    WHEN 'BACK'.
      LEAVE PROGRAM.
    WHEN 'EXIT'.
      LEAVE PROGRAM.
    WHEN 'CANC'.
      LEAVE PROGRAM.
    WHEN 'RETURN'.
      LEAVE PROGRAM.
ENDCASE.
ENDMODULE.                    "user_command_0100 INPUT
MODULE status_0200 OUTPUT.
IF grid_container1 IS INITIAL.
    PERFORM instantiate_grid
       USING grid_container1
             grid2
             'CCONTAINER2'.
* Grid title secondary grid
    struct_grid_lset-grid_title = 'Delimited Objects'.
    struct_grid_lset-edit = ' '.
    PERFORM display_grid
     USING
        grid2
         <dyn_table1>
         it_fldcat1.
SET PF-STATUS '001'.
SET TITLEBAR '000' WITH 'Org Units Delimited'.
endif.
ENDMODULE.                    "status_0200 OUTPUT
In your local event handling class use the variable SENDER to determine which grid / object triggered the event
for example
CLASS lcl_event_handler DEFINITION .
PUBLIC SECTION .
    METHODS:
**Hot spot Handler
    handle_hotspot_click FOR EVENT hotspot_click OF cl_gui_alv_grid
                      IMPORTING e_row_id e_column_id es_row_no,
**Double Click Handler
    handle_double_click FOR EVENT double_click OF cl_gui_alv_grid
                                    IMPORTING e_row e_column es_row_no
                                    sender,
** Toolbar handler.
handle_toolbar
        FOR EVENT toolbar OF cl_gui_alv_grid
            IMPORTING e_object e_interactive
            sender,
* button press
    handle_user_command
        FOR EVENT user_command OF cl_gui_alv_grid
            IMPORTING e_ucomm
             sender,
* data changed
handle_data_changed
    FOR EVENT data_changed OF cl_gui_alv_grid
      IMPORTING er_data_changed,
*data changed finished
handle_data_changed_finished
     FOR EVENT data_changed OF cl_gui_alv_grid,
download_to_excel.
ENDCLASS.                    "lcl_event_handler DEFINITION
* Implementation methods for lcl_event_handler
CLASS lcl_event_handler IMPLEMENTATION.
*Handle Hotspot Click
* When a "hotspotted"cell is double clicked
* Hotspot indicatore needs to be set in
* the field catalog.
* Not required for this application.
METHOD handle_hotspot_click .
    PERFORM mouse_click
      USING e_row_id
            e_column_id.
    CALL METHOD grid1->get_current_cell
      IMPORTING
        e_row     = ls_row
        e_value   = ls_value
        e_col     = ls_col
        es_row_id = ls_row_id
        es_col_id = ls_col_id
        es_row_no = es_row_no.
    CALL METHOD grid1->refresh_table_display.
    CALL METHOD grid1->set_current_cell_via_id
      EXPORTING
        is_column_id = e_column_id
        is_row_no    = es_row_no.
ENDMETHOD.                    "lcl_event_handler
*Handle Double Click
METHOD handle_double_click.
    CASE sender.
      WHEN grid1.
* returns cell double clicked FROM GRID 1
* Ignore any event from GRID 2
        PERFORM double_click
           USING e_row
           e_column.
    ENDCASE.
ENDMETHOD.                    "handle_double_click
* Add our buttons to standard toolbar
METHOD handle_toolbar.
    CASE sender.
* Only add functionality to PRIMARY GRID (GRID 1)
      WHEN grid1.
* append a separator to normal toolbar
        CLEAR ls_toolbar.
        MOVE 3 TO ls_toolbar-butn_type.
        APPEND ls_toolbar TO e_object->mt_toolbar.
* Delimit Org
        CLEAR ls_toolbar.
        MOVE 'PROC' TO ls_toolbar-function.
        MOVE icon_railway TO ls_toolbar-icon.
        MOVE 'DELIMIT' TO ls_toolbar-quickinfo.
        MOVE 'DELIMIT ORG UNIT' TO ls_toolbar-text.
        MOVE ' ' TO ls_toolbar-disabled.
        APPEND ls_toolbar TO e_object->mt_toolbar.
* Select All Rows
        MOVE 'SELE' TO ls_toolbar-function.
        MOVE icon_select_all TO ls_toolbar-icon.
        MOVE 'ALL CELLS' TO ls_toolbar-quickinfo.
        MOVE 'ALL CELLS' TO ls_toolbar-text.
        MOVE ' ' TO ls_toolbar-disabled.
        APPEND ls_toolbar TO e_object->mt_toolbar.
* Deselect all Rows.
        MOVE 'DSEL' TO ls_toolbar-function.
        MOVE icon_deselect_all TO ls_toolbar-icon.
        MOVE 'DESELECT ALL' TO ls_toolbar-quickinfo.
        MOVE 'DESELECT ALL' TO ls_toolbar-text.
        MOVE ' ' TO ls_toolbar-disabled.
        APPEND ls_toolbar TO e_object->mt_toolbar.
        ENDCASE.
     move 0 to ls_toolbar-butn_type.
     move 'EXCEL' to ls_toolbar-function.
     move space to ls_toolbar-disabled.
     move icon_xxl to ls_toolbar-icon.
     move 'Excel' to ls_toolbar-quickinfo.
     move 'EXCEL' to ls_toolbar-text.
     append ls_toolbar to e_object->mt_toolbar.
ENDMETHOD.                    "handle_toolbar
METHOD handle_user_command.
* Entered when a user presses a Grid toolbar
* standard toolbar functions processed
* normally
   g_sender = sender.
    CASE e_ucomm.
      WHEN 'PROC'.    "Process selected data
        PERFORM get_selected_rows.
      WHEN 'SELE'.
        PERFORM select_all_rows.
      WHEN 'DSEL'.
        PERFORM deselect_all_rows.
      WHEN 'EXCEL'.
          call method me->download_to_excel.
        WHEN OTHERS.
    ENDCASE.
ENDMETHOD.                    "handle_user_command
METHOD handle_data_changed.
* only entered on data change Not req for ths app.
    PERFORM data_changed USING er_data_changed.
ENDMETHOD.                    "data_changed
METHOD handle_data_changed_finished.
* only entered on data change finished Not req for ths app.
    PERFORM data_changed_finished.
ENDMETHOD.                    "data_changed_finished
* Interactive download to excel
method download_to_excel.
field-symbols:
   <qs0>   type standard table,
   <qs1>   type standard table.
data: G_OUTTAB1 type ref to data,
        g_fldcat1 type ref to data,
        LS_LAYOUT type KKBLO_LAYOUT,
        LT_FIELDCAT type KKBLO_T_FIELDCAT,
        LT_FIELDCAT_WA type KKBLO_FIELDCAT,
        L_TABNAME type SLIS_TABNAME.
case g_sender.
when grid1.
     get reference of <dyn_table> into g_outtab1.
     get reference of it_fldcat into g_fldcat1.
   when grid2.
   get reference of <dyn_table1> into g_outtab1.
     get reference of it_fldcat1 into g_fldcat1.
endcase.
   assign g_outtab1->* to <qs0>.
    assign g_fldcat1->* to <qs1>.
       call function 'LVC_TRANSFER_TO_KKBLO'
      exporting
        it_fieldcat_lvc   = <qs1>
*     is_layout_lvc     = m_cl_variant->ms_layout
         is_tech_complete = ' '
      importing
        es_layout_kkblo   = ls_layout
        et_fieldcat_kkblo = lt_fieldcat.
    loop at lt_fieldcat into lt_fieldcat_wa.
      clear lt_fieldcat_wa-tech_complete.
      if lt_fieldcat_wa-tabname is initial.
        lt_fieldcat_wa-tabname = '1'.
        modify lt_fieldcat from lt_fieldcat_wa.
      endif.
      l_tabname = lt_fieldcat_wa-tabname.
    endloop.
    call function 'ALV_XXL_CALL'
         exporting
              i_tabname           = l_tabname
              is_layout           = ls_layout
              it_fieldcat         = lt_fieldcat
              i_title             = sy-title
         tables
              it_outtab           = <qs0>
         exceptions
              fatal_error         = 1
              no_display_possible = 2
              others              = 3.
    if sy-subrc <> 0.
      message id sy-msgid type 'S' number sy-msgno
             with sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
    endif.
endmethod.
ENDCLASS.                    "lcl_event_handler IMPLEMENTATION
The sender instance is a variable such as g_sender type ref to cl_gui_alv_grid.       "Sender instance.
The above example is for OO ALV grids but should work for other interactive cases where a User presses a key or does a mouse action.
Cheers
jimbo

Can a thread's start() method be called more than once?

Is it legal/well-defined to call a Thread object's start() method after a previous call to start() has completed?
eg.
Thread t = new Thread(public void run() {...});
t.start();
t.join();
t.start(); // will this call fail?

Ok, since no one's going to answer you I will.
Yes. It won't work if you call start() multiple times and it will throw an exception on all subsequent times.
The way I work around it is to put the method in an inner-class and then create a new instance of that iner-class everytime I want to start a new thread.

Listener ( lsnrctl ) - stop and start just one instance

Hey all. I hava a Oracle 9.2 installed over a Linux Red Hat 4.0 64 bits server.
Some Virtual Machines will connect in some databases installed in my Oracle server. My listener has one instance for each database like this:
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = VM01)
(ORACLE_HOME = /opt/oracle/product/9.2.0)
(SID_NAME = VM01)
(SID_DESC =
(GLOBAL_DBNAME = VM02)
(ORACLE_HOME = /opt/oracle/product/9.2.0)
(SID_NAME = VM02)
(SID_DESC =
(GLOBAL_DBNAME = VM03)
(ORACLE_HOME = /opt/oracle/product/9.2.0)
(SID_NAME = VM03)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = VM01))
(ADDRESS = (PROTOCOL = IPC)(KEY = VM02))
(ADDRESS = (PROTOCOL = IPC)(KEY = VM03))
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = lab2)(PORT = 1521))
And my tnsnames:
VM03 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = lab2)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = VM03)
VM02 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = lab2)(PORT = 1521))
(CONNECT_DATA =
(SID = VM02)
VM01 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = lab2)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = VM01)
I need to start and stop just one instance (VM01 or VM02 or VM03). I really can't stop all instances when I need to stop just one. And more if i have to create another instance i will have to stop the listener... and i can't because other people are using your instance...
Do you know how to help me?
Thanksssssss

You still use listener.ora, just create 3 listeners, one for each instance:
listener.ora:
LISTENER_VM01 =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(HOST = lab2)(KEY = VM01))
(ADDRESS = (PROTOCOL = TCP)(HOST = lab2)(PORT = 1521))
SID_LIST_LISTENER_VM01 =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = VM01)
(ORACLE_HOME = /opt/oracle/product/9.2.0)
(SID_NAME = VM01)
LISTENER_VM02 =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(HOST = lab2)(KEY = VM02))
(ADDRESS = (PROTOCOL = TCP)(HOST = lab2)(PORT = 1522))
SID_LIST_LISTENER_VM02 =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = VM02)
(ORACLE_HOME = /opt/oracle/product/9.2.0)
(SID_NAME = VM02)
LISTENER_VM03 =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(HOST = lab2)(KEY = VM03))
(ADDRESS = (PROTOCOL = TCP)(HOST = lab2)(PORT = 1523))
SID_LIST_LISTENER_VM03 =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = VM03)
(ORACLE_HOME = /opt/oracle/product/9.2.0)
(SID_NAME = VM03)
Then, when you need to stop the connections to only one instance, you stop the corresponding listener:
lsnrctl stop listener_vm02
lsnrctl start listener_vm02
For each instance you need to configure the parameter local_listener:
sys@VM01> alter system set local_listener=listener_vm01;
sys@VM02> alter system set local_listener=listener_vm02;
sys@VM03> alter system set local_listener=listener_vm03;
And register in tnsnames.ora:
listener_vm01=
(DESCRIPTION=
(ADDRESS=(PROTOCOL=tcp)(HOST=lab2)(PORT=1521)))
listener_vm02=
(DESCRIPTION=
(ADDRESS=(PROTOCOL=tcp)(HOST=lab2)(PORT=1522)))
listener_vm03=
(DESCRIPTION=
(ADDRESS=(PROTOCOL=tcp)(HOST=lab2)(PORT=1523)))
It's a recommended configuration for the flexibility it provides,it requires a different port for each listener, but you don't need to edit the listener.ora file each time you need to stop the connectivity to only one instance.

Have one instance on linux running one database.can i create more databases to sam

i have one instance on linux running one database.can i create more databases to same instance and they all remain up .

you can create more than one database (Instance) on the same machine, start up all of them, in the connect string write the Instance name you want to work with.
null

I have multiple devices in my family. Each of us has an iPhone and an iPad. Is there a way for each of us to have our own Apple ID but one account so we can all get the same music, movies, books, etc. I can't see paying twice for something in the same fam

I have multiple devices in my family. Each of us has an iPhone and an iPad. Is there a way for each of us to have our own Apple ID but one account so we can all get the same music, movies, books, etc. I can't see paying twice for something in the same family.

Welcome to the world of digital media. Your can't really transfer it. I don't know what the rules are about transferring to your spouse but I do know that in some cases when you die, your heirs cannot inherit your digital media. This is why there is still an advantage to buying the CD since the usage rights belong to whomever holds the physical media.
A possible workaround is to burn the songs to a music CD with yout account (tracks only without song titles) and then having your wife upload it as a regular music CD onto her account. It's been a while since i've done this so I'm not sure if it would work now.
Please note that I'm not advocating copyright and/or TOS violations. I'm only suggesting ways to copy music for your own personal use which has traditonally been permitted. I only did this because I wanted to convert iTunes songs to mp3 files so I could burn them onto a data CD for use in my car. It would make sense that since married couples are a joint entity, this would be personal use.
Also, I'm not a lawyer so don't take this as legal advice.

Can start method invoke twice at one instance

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