There isn't a separate orainventory for each ORACLE_HOME.  A single
orainst.loc file defines where orainventory is located, and the
orainventory contains info about what is installed for all versions of
Oracle on the system (8i and above).   

A single oratab file is used by all versions of Oracle to set
ORACLE_HOME and ORACLE_SID in the dbshut/dbstart scripts.  

In most cases both the oratab and orainventory files are found under
/var/opt/oracle.

Hamid Alavi wrote:
> 
> List,
> 
> Can some body tell me what's the usage of oratab & orainst.loc files (sun
> solaris OS), I am getteing confused because I have two diffrent Oracle_home
> but just one one Orainventory Directory, It shouldn,'t be for each
> oracle_home own Orainventory directory???
> Appreciate your HELP.
> Thanks,
> 
> -----Original Message-----
> Sent: Monday, June 03, 2002 12:58 PM
> To: Multiple recipients of list ORACLE-L
> 
> >> 1. Use a separate tech stack (oracle home) for each instance.
> In general I like the idea, but it gets a bit pricey on disk space if you
> are running say 20-30 instances on a given box doesn't it??
> 
> >> 1a. Use a separate unix account for each oracle home for total isolation.
> The DBA here is
> >> real anal.  (BTW, that's me).
> I tend to be a bit anal too, but this is perhaps overkill.... :-)
> 
> >> 3. Back up the OraInventory directory before and after an
> install/upgrade.  If this
> >> directory get hammered, there is no way to recreate it except to
> re-install (Thank
> >> You Oracle! <all the sarcasm in the world implied here>).
> 100% agree with this one.
> 
> >> I've also found that it is easier to use one listener for each instance
> instead of one
> >> listener for all instances.
> While I like different listeners for different versions, one per instance
> seems like a bit
> of overkill. Again, 20 different listeners is expensive from a memory POV
> and I've got to find
> 20 unused ports.
> 
> >> For those on the list that disagree, flame away.
> No flames here, just seems like overkill to me.... The number of failures I
> have gotten
> that would have been saved by this amount of overkill would fit on maybe 2
> or 3 fingers
> in about 12 years of DBA'ing, and I can't remember a production problem in
> any event that
> would have been saved.... cost benefit isn't there based on that.
> 
> But hey, I'm all for high availability!!
> 
> RF
> 
> Robert G. Freeman - Oracle8i OCP
> Oracle DBA Technical Lead
> CSX Midtier Database Administration
> Author: Oracle9i New Features
> Mastering Oracle8i
> 
> -----Original Message-----
> Sent: Monday, June 03, 2002 2:14 PM
> To: Multiple recipients of list ORACLE-L
> 
> This is why we:
> 1. Use a separate tech stack (oracle home) for each instance.
> 1a. Use a separate unix account for each oracle home for total isolation.
> The DBA here is real
> anal.  (BTW, that's me).
> 1b. I've also found that it is easier to use one listener for each instance
> instead of one listener
> for all instances.
> 1c. We go so far as to give Oracle Names its own tech stack.
> 2. For each tech stack install, use a separate OraInventory directory.  See
> metastink for details on
> this.
> 3. Back up the OraInventory directory before and after an install/upgrade.
> If this directory get
> hammered, there is no way to recreate it except to re-install (Thank You
> Oracle! <all the sarcasm in
> the world implied here>).
> 
> For those on the list that dissagree, flame away.  This is what I've found
> works the best in this
> environment.
> 
> In any case, if the 8.1.6.2 is in a separate home, then the 8.1.7 instance
> upgrade will not effect
> it.  Since the patch says that there is nothing to upgrade, the
> /var/opt/oracle/oraInst.loc file
> probably points to the 8.1.6 OraInventory instead of the 8.1.7 OraInventory.
> 
> Ron Thomas
> Hypercom, Inc
> [EMAIL PROTECTED]
> "The problem with some people is that when they aren't drunk, they're
> sober."  --William Butler
> Yeats.
> 
> 
> 
>                       hamid.alavi@quova
> 
>                       dx.com                   To:
> [EMAIL PROTECTED]
> 
>                       Sent by:                 cc:
> 
>                       [EMAIL PROTECTED]         Subject:  RE: Upgrade
> Question
> 
> 
> 
> 
>                       06/03/02 10:23 AM
> 
>                       Please respond to
> 
>                       ORACLE-L
> 
> 
> 
> 
> 
> I have also two other instances running on 8.1.6.2, This upgrade may be
> effected from these version of Oracle or not, or this upgrade can be totaly
> independent from 8.1.6.2
> I am a bit confused, Need your advise guy
> Thanks allot
> 
> -----Original Message-----
> Sent: Monday, June 03, 2002 9:59 AM
> To: Multiple recipients of list ORACLE-L
> 
> You generally get this error if the conents of the file
> /var/opt/oracle/oraInst.loc points to the
> wrong OraInventory directory.
> 
> We just went to 8.1.7.4 to resolve some issues with .2.  So far, so good.
> 
> Ron Thomas
> Hypercom, Inc
> [EMAIL PROTECTED]
> "The problem with some people is that when they aren't drunk, they're
> sober."  --William Butler
> Yeats.
> 
>                       hamid.alavi@quova
> 
>                       dx.com                   To:
> [EMAIL PROTECTED]
> 
>                       Sent by:                 cc:
> 
>                       [EMAIL PROTECTED]         Subject:  Upgrade Question
> 
>                       06/03/02 09:18 AM
> 
>                       Please respond to
> 
>                       ORACLE-L
> 
> Hi List,
> 
> Friday afternoon I try to upgrade database(8.1.7.0 on sun solaris) to
> 8.1.7.4 but after few minutes I got the following message:
> "There are no Patches need to be applied from the patch set oracle 8i patch
> set 8.1.7.4.0" and doesn't go thru at all,  My question is for installing
> any patch do I have to install the previous patch first or what?
> Is there any Prepatch to Install for any patching or NOT?
> We have two option for upgrading 8.1.7.2 OR 8.1.7.4, Which one is better &
> safer??
> If I want to go for Patch 4,is there any comments or recommendation
> Really appreciate
> 
> Hamid Alavi
> Office 818 737-0526
> Cell    818 402-1987
> 
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> Author: Hamid Alavi
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> --
> Author: Hamid Alavi
>   INET: [EMAIL PROTECTED]
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