Thank you so much
Regards,
Elisa
--- On Thu, 8/19/10, Quincey Koziol <koziol@hdfgroup.org> wrote:
From: Quincey Koziol <koziol@hdfgroup.org>
Subject: Re: [Hdf-forum] Handle concurrency, transaction (or any features provided) in HDF5 compare to SQL Server
To: "HDF Users Discussion List" <hdf-forum@hdfgroup.org>
Date: Thursday, August 19, 2010, 8:04 AM
Hi Elisa,
On Aug 18, 2010, at 9:57 AM, elisa sibarani wrote:
> what I mean is not really the same feature as SQL Server has, but all features regarding reading from a file. I've read your reply to hdf forum as follows:
>
> True concurrent access to a file when it is being written to is not
> currently supported. We are working to add a single-writer/multiple-reader
> access mode for the next release (1.10.0), but it's not available yet. The
> current way to have pseudo-concurrent access to a file is found here:
> http://www.hdfgroup.org/hdf5-quest.html#grdwt
>
> Quincey
>
> therefore, this H5Fflush is able to handle concurrency for reading a file?
Yes, when the SWMR feature is finished, it will support a particular form of concurrent access to HDF5 files. Along those "database" lines, we are finishing up support for journaling metadata updates to HDF5 files, which resembles transactions on modifications to HDF5 files, at least in the sense that all the changes from an HDF5 API routine will either be atomically reflected in the file, or not. It is also possible to implement a "mirroring" virtual file driver for replicating modifications to HDF5 files, although we don't have one currently implemented.
Quincey
> thanks
>
>
>
> --- On Wed, 8/18/10, Quincey Koziol <koziol@hdfgroup.org> wrote:
>
> From: Quincey Koziol <koziol@hdfgroup.org>
> Subject: Re: [Hdf-forum] Handle concurrency, transaction (or any features provided) in HDF5 compare to SQL Server
> To: "HDF Users Discussion List" <hdf-forum@hdfgroup.org>
> Date: Wednesday, August 18, 2010, 9:47 AM
>
> Hi Elisa,
>
> On Aug 18, 2010, at 12:28 AM, elisa sibarani wrote:
>
> > Hi all,
> >
> > I want to ask is there anyone of you can shares information about HDF5 features available until now? If I want to recommend my company to use HDF5, now I have to make sure it'll work at least as reliable as SQL Server. Therefore, I want to make a comparison about services/features available in SQL Server such as transaction (locking process), concurrency, replication (for back up) and so on. How I can get such information about HDF5?
>
> HDF5 does not have transactions, concurrency or replication features. It is not a database. It is designed for storing and sharing large array-like datasets in a hierarchically structured file (see http://www.hdfgroup.org/HDF5/whatishdf5.html for some more details and documentation).
>
> Quincey
>
> > Or maybe if anyone has experience (at least once) to move from SQL Server to HDF5, maybe you can share about what list of things I should put in mind for this changes?
> >
> > Thanks all.
> >
> > Regards,
> > Elisa
> >
> > _______________________________________________
> > Hdf-forum is for HDF software users discussion.
> > Hdf-forum@hdfgroup.org
> > http://mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org
>
>
> _______________________________________________
> Hdf-forum is for HDF software users discussion.
> Hdf-forum@hdfgroup.org
> http://mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org
>
>
> _______________________________________________
> Hdf-forum is for HDF software users discussion.
> Hdf-forum@hdfgroup.org
> http://mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org
_______________________________________________
Hdf-forum is for HDF software users discussion.
Hdf-forum@hdfgroup.org
http://mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org
_______________________________________________
Hdf-forum is for HDF software users discussion.
Hdf-forum@hdfgroup.org
http://mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org
