How to select sysdate of remote database
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Thread: How to select sysdate of remote database

  1. #1
    Join Date
    Nov 2003
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    How to select sysdate of remote database

    I want to fetch the sysdate of a remote database using dblink, I used the following sql :

    select sysdate from dual@remote_db_link

    But this fetches me local server date and not of the remote one.

    Is there a sql to do this, since i can't write procedures in each remote machines which will be called by local sever to do the same task.

    Thanks

  2. #2
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    Re: How to select sysdate of remote database

    Originally posted by send2sachin
    I want to fetch the sysdate of a remote database using dblink, I used the following sql :

    select sysdate from dual@remote_db_link

    But this fetches me local server date and not of the remote one.

    Is there a sql to do this, since i can't write procedures in each remote machines which will be called by local sever to do the same task.

    Thanks
    Darn! This question seemed so trivial at first, yet I have spend couple of hours searching for an answer with no luck! It seems to me that there realy is no other way but to create a function or a view on remote database to get the sysdate of that database over db link.

    If anyone finds a direct way to get a remote sysdate without creating any additional object on a remote database, I'd be very interested.
    Jurij Modic
    ASCII a stupid question, get a stupid ANSI
    24 hours in a day .... 24 beer in a case .... coincidence?

  3. #3
    Join Date
    Feb 2001
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    203
    Nope!

    Only by using function or view, you can retrieve sysdate from remote database.

    I found this document in metalink, Give a look..
    http://metalink.oracle.com/metalink/...1&p_showHelp=1

    Sree.
    sree

  4. #4
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    (A wild thought born of ignorance) Is there any standard process that can be set off remotely and is recorded in the SYS tables? e.g. ANALYZE dual and look at LAST_ANALYZED?

    If this could be done, there would be an error in the time bigger than the network delay - it might be acceptable.

  5. #5
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    Don't think so. You can't call a remote procedure over db_link that performs an explicit or implict commit or rollback. And executing ANALYZE or something like that remotely performs implicit commit.....
    Jurij Modic
    ASCII a stupid question, get a stupid ANSI
    24 hours in a day .... 24 beer in a case .... coincidence?

  6. #6
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    . . . so let's look in memory.


    a) does anyone know if elapsed time since v$instance.startup_time is stored anywhere?


    b) VERY NASTY workaround - far from being bomb-proof:

    IF you can uniquely identify the row in v$session (without using SYS_CONTEXT!) that belongs the the current session, e.g. by user & being remote:

    Code:
     drop database link remote;  -- must be v.recent connection
    
    create database link remote
    connect to scott identified by tiger
    using 'ORCL';
    
    select to_char(logon_time, 'DD-MON-YYYY HH24:MI:SS') 
    from v$session@remote
    where osuser = 'NT AUTHORITY\SYSTEM'  -- under NT this is a remote connection
    and   username = 'SCOTT';
    It's a knotty problem . . .
    Last edited by DaPi; 11-11-2003 at 03:40 PM.

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