[gdal-dev] When and why ogrinfo sends update for Oracle?

[Rahkonen Jukka]

Hi,

If I do ogrinfo with "--debug on" against Oracle l can see updates for USER_SDO_GEOM_METADATA.  Same happens if I do ogr2ogr with output to for example GML. For me is seems not to happen only with loading and updating. I have not an easy access to Oracle logs and I have studied only the OGR debug messages on my screen.

-Jukka Rahkonen-

Smith, Michael wrote:

> 
> Jukka,
> 
> I'm responsible for the code the calculates the min/max extents for
> inserting/updating the USER_SDO_GEOM_METADATA view. This is supposed
> to only be run via ogr2ogr when loading/updating tables (I didn;t write that
> part, just the query to get those extents). There shouldn't be any updating
> going on in an ogrinfo call.
> 
> Personally, I do think that any calls against the ALL_SDO_GEOM_METADATA
> should really only go against USER_SDO_GEOM_METADATA. There were a
> couple of tickets about 2 years ago that implemented thee changes. I'll look
> them up and post the tickets.
> 
> Mike
> 
> --
> Michael Smith
> 
> US Army Corps
> Remote Sensing GIS/Center
> 
> 
> 
> On 8/22/12 7:36 AM, "Rahkonen Jukka" <Jukka.Rahkonen at mmmtike.fi>
> wrote:
> 
> >Stefano Iacovella wrote:
> >
> >
> >>> I guess that meaning is to check all the metadata rows from the
> >>> ALL_SDO_GEOM_METADATA view which are referring to the queried
> table.
> >>> There can be several rows created be different Oracle users. Next
> >>> the maximum BBOX is constructed and that is updated into
> >>> USER_SDO_GEOM_METADATA view.
> >
> >> It seems to me that first statement  should include an OWNER filter
> >>in the WHERE clause, or it will fetch all records for table with same
> >>name and same geometric filedname.
> >
> >Not really, it is normal in managed envinronment that db admins or data
> >managers are creating and updating the tables but reporting is done
> >with minimal rights.  So reading ALL_SDO_GEOM_METADATA does make
> sense.
> >And actually  USER_SDO_GEOM_METADATA is a view into the same data
> than
> >ALL_SDO_GEOM_METADATA filtered by the current username.  Oracle
> holds
> >the data in a real table named mdsys.sdo_geom_metadata_table but users
> >cannot handle that table directly, everything goes through views and
> triggers.
> >
> >I do not know if it makes much sense really to have several metadata
> >rows with different owners in the metadata table but it happens and it
> >must be done sometimes. Some programs do not even try to read
> >ALL_SDO_GEOM_METADATA.  That means that developers have not
> worked too
> >much in a real production environment and they are creating their test
> >tables with some Oracle admin account  and then they are reading the
> >data with their clients with the same admin account. Bad habbit but
> >totally understandable, it is much faster and easier so.  It is OK but
> >before finalizing with coding it would be good to make a test: What if
> >I try to do this with limited rights? It would be good also to write it
> >into documentation what rights and into which tables are needed.
> >Policy in our house is that a non-admin Oracle user has by default no
> >rights to do anything. Everything must be explicitly granted.  Now we
> >have usually learned by trial and error by adding grants one by one and
> >following what is blocking us next.
> >
> >-Jukka Rahkonen-
> >
> >
> >Regards
> >
> >stefano
> >---------------------------------------------------
> >41.95581N 12.52854E
> >
> >
> >http://www.linkedin.com/in/stefanoiacovella
> >
> >http://twitter.com/#!/Iacovellas
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