[gdal-dev] [External] : Re: GDAL driver Open() calls

[Even Rouault]

Hi,

The logs didn't directly answer my question as they lacked the chain of 
calls, but I believe I figured out the reason. Please try 
https://github.com/OSGeo/gdal/pull/8865

Even

Le 29/11/2023 à 02:56, Fengting Chen a écrit :
>
> The attached are two output logs with debug on. You can see that the 
> output from GDAL 3.7 has two extra queries at the beginning. These 
> queries only happen when the eAccess is GA_ReadOnly. The logs are 
> generated with the same command parameters to gdal_translate.
>
> *From: *Even Rouault <even.rouault at spatialys.com>
> *Date: *Tuesday, November 28, 2023 at 6:36 PM
> *To: *Fengting Chen <fengting.chen at oracle.com>, 
> gdal-dev at lists.osgeo.org <gdal-dev at lists.osgeo.org>
> *Subject: *[External] : Re: [gdal-dev] GDAL driver Open() calls
>
> Hi,
>
> Please share the stack trace (on a debug build) of both instances 
> where GDALOpen() is called
>
> Even
>
> Le 28/11/2023 à 23:40, Fengting Chen via gdal-dev a écrit :
>
>     Hi,
>
>     I noticed from the GeoRaster driver that in GDAL 3.6 and 3.7
>     (maybe 3.8 too),  there are two GDALOpen() calls on the driver
>     with GDALOpenInfo eAccess as GA_ReadOnly, even when the GeoRaster
>     is the output format in gdal_translate command. There are no such
>     calls in GDAL 3.4. I am wondering if these invocations of Open()
>     with eAccess as GA_ReadOnly are necessary when the driver is the
>     output driver. This has caused performance issue for the GeoRaster
>     driver when a user is trying to load the data into Oracle database
>     because it has two unnecessary reads from the database.  If these
>     Open() calls are unavoidable, how to differentiate the calls
>     whether it is as input or as output in the gdal_translate command?
>
>     Thanks.
>
>
>
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