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Idle instance [message #658982] Tue, 03 January 2017 05:20 Go to next message
ram_orafaq1989
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Registered: October 2016
Junior Member
Hi Team,
Is it possible to connect to idle instance in a linux system after the database is up and running.I know there is a way by setting the ORACLE_SID value to a junk value . Is there any other way to connect to idle instance in a system that is already running the database.
Thanks .
Re: Idle instance [message #658984 is a reply to message #658982] Tue, 03 January 2017 05:27 Go to previous messageGo to next message
cookiemonster
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Location: Rainy Manchester
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Idle instance = database not running.
So what are you actually trying to achieve here?
Re: Idle instance [message #658987 is a reply to message #658982] Tue, 03 January 2017 06:29 Go to previous messageGo to next message
EdStevens
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Registered: September 2013
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ram_orafaq1989 wrote on Tue, 03 January 2017 05:20
Hi Team,
Is it possible to connect to idle instance in a linux system after the database is up and running.I know there is a way by setting the ORACLE_SID value to a junk value . Is there any other way to connect to idle instance in a system that is already running the database.
Thanks .
By definition, an instance that is running is not idle.

I agree with Cookiemonster ... what are you trying to achieve here?

[Updated on: Tue, 03 January 2017 06:30]

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Re: Idle instance [message #658990 is a reply to message #658982] Tue, 03 January 2017 07:47 Go to previous messageGo to next message
Michel Cadot
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Also, if you want to continue to get help you should envisage to feedback and thank people ywho try to help you.
Please review your previous topic.

Re: Idle instance [message #659011 is a reply to message #658982] Wed, 04 January 2017 02:56 Go to previous messageGo to next message
gazzag
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Location: Bristol, UK
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ram_orafaq1989 wrote on Tue, 03 January 2017 11:20
Hi Team,
I know there is a way by setting the ORACLE_SID value to a junk value .
Correct. If you set your ORACLE_SID to a non-existent SID SQL*Plus will indeed report that it has connected you to "an idle instance". However, a subsequent STARTUP command would fail. As others have enquired, what exactly are you trying to achieve?
Re: Idle instance [message #659060 is a reply to message #658990] Thu, 05 January 2017 06:32 Go to previous messageGo to next message
ram_orafaq1989
Messages: 5
Registered: October 2016
Junior Member
Hi all,
Thanks for all your replies . I am a PL SQL developer . Just wanted to know if Oracle supports logging in SQL Plus with SYSDBA role without connecting to any instance or database.
Also after logging in , if we set up the init.ora Start up file with a junk db name , it should start the instance right ?. Correct me if I am wrong .

@Micheal Cadot,
Thanks for your feedback , I will make sure to place my thanks for the replies.
Re: Idle instance [message #659061 is a reply to message #659060] Thu, 05 January 2017 06:38 Go to previous messageGo to next message
EdStevens
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Registered: September 2013
Senior Member
ram_orafaq1989 wrote on Thu, 05 January 2017 06:32
Hi all,
Thanks for all your replies . I am a PL SQL developer . Just wanted to know if Oracle supports logging in SQL Plus with SYSDBA role without connecting to any instance or database.
Look at the /nolog command line option. Has nothing to do with 'as sysdba' or not.

https://docs.oracle.com/cd/E11882_01/server.112/e16604/ch_three.htm#i1169374

Quote:

Also after logging in , if we set up the init.ora Start up file with a junk db name , it should start the instance right ?. Correct me if I am wrong .
IF you set ORACLE_SID to some "junk" value, you could start an instance in NOMOUNT with

SQL> startup nomount pfile='init.ora'

But there is not much you could do with it so the fundamental question remains. Why would you want to? What are you really trying to accomplish?

oracle:junkdb$ cat initjunkdb.ora
db_block_size=8192
db_name="junkdb"

oracle:junkdb$ export ORACLE_SID=junkdb

oracle:junkdb$ sqlplus /nolog

SQL*Plus: Release 12.1.0.2.0 Production on Thu Jan 5 06:49:45 2017

Copyright (c) 1982, 2014, Oracle.  All rights reserved.

SQL> conn / as sysdba
Connected to an idle instance.
SQL> startup nomount pfile='initjunkdb.ora'
ORACLE instance started.

Total System Global Area  234881024 bytes
Fixed Size                  2922904 bytes
Variable Size             176162408 bytes
Database Buffers           50331648 bytes
Redo Buffers                5464064 bytes
SQL>

[Updated on: Thu, 05 January 2017 06:51]

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Re: Idle instance [message #659203 is a reply to message #659061] Mon, 09 January 2017 09:11 Go to previous messageGo to next message
ram_orafaq1989
Messages: 5
Registered: October 2016
Junior Member
Hi Ed,
Thanks for your reply . I understand there is not much practical usability with my question .Just wanted to know a few things with respect to authentication in sqlplus .
Thanks.
Re: Idle instance [message #659204 is a reply to message #659203] Mon, 09 January 2017 09:19 Go to previous messageGo to next message
gazzag
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If you're a member of the O/S "dba" group "sqlplus / as sysdba" will work regardless.

[Edit: typo]

[Updated on: Mon, 09 January 2017 09:42]

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Re: Idle instance [message #659208 is a reply to message #659203] Mon, 09 January 2017 09:53 Go to previous messageGo to next message
Michel Cadot
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ram_orafaq1989 wrote on Mon, 09 January 2017 16:11
Hi Ed,
Thanks for your reply . I understand there is not much practical usability with my question .Just wanted to know a few things with respect to authentication in sqlplus .
Thanks.
So what did you learn?

Re: Idle instance [message #659269 is a reply to message #659208] Wed, 11 January 2017 03:14 Go to previous messageGo to next message
ram_orafaq1989
Messages: 5
Registered: October 2016
Junior Member
That we can login into sql plus and start instances without any connection to database.Understood that sqlplus , instances and databases are separate entities that can be worked with independently.
Re: Idle instance [message #659270 is a reply to message #659269] Wed, 11 January 2017 03:30 Go to previous message
John Watson
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Registered: January 2010
Location: Global Village
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ram_orafaq1989 wrote on Wed, 11 January 2017 09:14
That we can login into sql plus and start instances without any connection to database.Understood that sqlplus , instances and databases are separate entities that can be worked with independently.
Not quite correct. Yes, SQL*Plus, the instance, and the database are separate. But you do not log in to SQL*Plus. You log in with SQL*Plus. The instance is memory structures and processes: it lives on your CPUs and in your RAM, and is transient; you start and stop it. The database is persistent: it is files on disc, and exists from creation until you deliberately delete it. An "ORacle server" is an instance plus a database. What ties it all together is the concept of a "session". A session is a connection from the SQL*Plus client to the Oracle server, and the login occurs when the session is established.
If the instance is "idle", you have a special case: just one instance process is launched, the process that supports your session. Log in to that, and you can use it to launch the instance and then create a database or open an already extant database.

Clear?
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