On Sat, 20 Jul 2013 18:03:43 +0100, Simon Slavin - slav...@bigfraud.org
<sqlite.browseruk.021993da41.slavins#bigfraud....@ob.0sg.net> wrote:
On 20 Jul 2013, at 3:11pm, sqlite.20.browse...@xoxy.net wrote:
this in-memory database actually persists. Ie. Beyond the life of the
program that created it.
Then it's not an in-memory database. Have you obeyed the requirements:
<http://www.sqlite.org/uri.html>
version 3.7.7 or above, and compiled with SQLITE_USE_URI enabled ?
Um. You tell me. As a perl user I just installed a module from cpan
http://search.cpan.org/~ishigaki/DBD-SQLite-1.39/
that took care of fetching, building and installing sqlite.
If USE_URI was not defined when it was built, would connect accept a
uri-style filename?
And if it did, would it produce the behaviour that I am seeing?
Another way of asking:
Is it usual for sqlite to store its data in invisible alternate streams
under windows?
Well, That was something I could easily test, so I switched the connect
string from:
'dbi:SQLite:dbname=file:memdb2?mode=memory&cache=shared'
to:
'dbi:SQLite:dbname=mydb'
And sure enough a file called mydb showed up in the local directory with a
very real size (somewhat smaller for the same data:175k -v- 375k), and no
alternate streams.
So obviously, using the uri form cause sqlite to do something different.
And given that when I pass it the uri-form name (above), it names this
hidden, alternate stream as:
C:\test>streams file
Streams v1.56 - Enumerate alternate NTFS data streams
C:\test\file:
:memdb2?mode=memory&cache=shared:$DATA 347136
It kinda suggests that it knows what it is doing; and that it is both
understanding the URI-form; which one supposes would also mean that it is
understanding both
mode=memory & cache=shared.
So, to the best of my knowledge I am doing everything required to
correctly request it to construct an in-memory db. So,
Then it's not an in-memory database.
Not so helpful.
Simon.
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