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Re: PG 8.4 to 9.2 upgrade issues with ownership of large objects

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On 12/16/2012 6:21 PM, Tom Lane wrote:
David Wall <d.wall@xxxxxxxxxxxx> writes:
On 12/16/2012 11:22 AM, Tom Lane wrote:
Large objects didn't have privileges, nor owners, in 8.4.  If you don't
feel like fixing your apps right now, you can return to the previous
behavior by setting the obscurely-named lo_compat_privileges setting in
postgresql.conf.
I am using the latest JDBC driver and have not noted any other issues
with large objects accessed, created or deleted using the blob
interfaces.  What does fixing an app mean or entail?  We've always
accessed large objects as a simple blob stored and referenced in a table
as an OID with both having the same lifetime.
It would only be an issue if you created large objects under one role
and then tried to access them under another, since the default
permissions would forbid that.  I assumed since you were complaining
that you'd run into something of the sort ...

			regards, tom lane

Okay, that's good. I suspect the JDBC library is taking care of this, but I'll check with them. I think our issue was just on the restore of the backup from 8.4 which had no owner/permissions and the restore into 9.2 in which they were assigned. Our apps all use a more limited role than what the db admin uses, and I guess that's when it first appeared. We do reset all of the GRANTs for tables for the application role, but I guess that doesn't make it down to the large objects. I'll read up more on permissions as they relate large objects.

Thanks again for all your help, Tom.

David


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