From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Question on bounded / unbounded strings
Date: Mon, 26 Sep 2016 09:28:23 +0200
Date: 2016-09-26T09:28:23+02:00 [thread overview]
Message-ID: <nsaio3$1eav$1@gioia.aioe.org> (raw)
In-Reply-To: fe8f9119-b49d-4266-bb50-6e207197b243@googlegroups.com
On 26/09/2016 01:35, brbarkstrom@gmail.com wrote:
> I expect Dimitry wouldn't like putting Bounded_Strings into
> Direct_IO files, where they're useful for fields in records that act like
> variable length character strings in databases.
Surely not. Bounded string is a private type (A.4.4).
You *never* use such for any external activity, that would make your
program non-portable and thus the DB too.
Therefore a text field of Direct_IO element record should always be a
subtype of String and never bounded or unbounded string.
BTW, in many cases it is better to use Direct_IO rather as a block I/O
medium. You never know if all application level objects would fit into a
single block. My implementation of external B-trees keeps tree nodes in
Direct_IO blocks with indices pointing to the blobs spread over other
blocks arranged as a persistent memory pool. So there is no limitation
to how large an item could be and no space loss of underfilled blocks.
--
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de
next prev parent reply other threads:[~2016-09-26 7:28 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-13 8:46 Question on bounded / unbounded strings Arie van Wingerden
2016-09-13 9:04 ` Dmitry A. Kazakov
2016-09-22 2:10 ` John Smith
2016-09-22 7:24 ` Dmitry A. Kazakov
2016-09-22 9:01 ` J-P. Rosen
2016-09-22 9:53 ` Dmitry A. Kazakov
2016-09-22 10:58 ` G.B.
2016-09-22 12:05 ` Dmitry A. Kazakov
2016-09-22 14:14 ` G.B.
2016-09-22 17:18 ` Dmitry A. Kazakov
2016-09-22 11:08 ` J-P. Rosen
2016-09-22 12:05 ` Dmitry A. Kazakov
2016-09-22 13:18 ` Maciej Sobczak
2016-09-22 13:52 ` Dmitry A. Kazakov
2016-09-22 14:51 ` Maciej Sobczak
2016-09-22 17:13 ` Dmitry A. Kazakov
2016-09-23 5:50 ` Maciej Sobczak
2016-09-23 6:36 ` Simon Wright
2016-09-23 7:48 ` Dmitry A. Kazakov
2016-09-28 20:55 ` Randy Brukardt
2016-09-23 23:58 ` John Smith
2016-09-24 7:52 ` Dmitry A. Kazakov
2016-09-24 16:25 ` John Smith
2016-09-24 17:44 ` Dmitry A. Kazakov
2016-09-24 18:33 ` John Smith
2016-09-24 18:37 ` John Smith
2016-09-24 18:59 ` John Smith
2016-09-25 8:50 ` Dmitry A. Kazakov
2016-09-25 23:35 ` brbarkstrom
2016-09-26 7:28 ` Dmitry A. Kazakov [this message]
2016-09-26 12:39 ` brbarkstrom
2016-09-28 21:09 ` Randy Brukardt
2016-09-30 7:59 ` Björn Lundin
2016-09-13 9:35 ` gautier_niouzes
2016-09-13 10:41 ` Alejandro R. Mosteo
2016-09-13 17:41 ` Jeffrey R. Carter
2016-09-13 17:59 ` Björn Lundin
2016-09-14 11:23 ` Arie van Wingerden
2016-09-14 12:26 ` Arie van Wingerden
2016-09-14 12:28 ` Arie van Wingerden
2016-09-14 12:57 ` Arie van Wingerden
2016-09-14 19:39 ` Jeffrey R. Carter
2016-09-17 16:35 ` Arie van Wingerden
2016-09-16 14:43 ` Olivier Henley
2016-09-17 16:35 ` Arie van Wingerden
replies disabled
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox