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-Ursprüngliche Nachricht-
Von: dave [mailto:d...@ziggurat29.com]
Gesendet: Sonntag, 26. Oktober 2014 00:36
An: 'General Discussion of SQLite Database'; sqlite-...@sqlite.org
Betreff: Re: [sqlite] quasi-bug related to locking, and attached databases
-Original Message-
From: sqlite
On Mon, Oct 27, 2014 at 9:23 AM, Hick Gunter h...@scigames.at wrote:
SQLite treats each attached database as a separate entity. Attaching the
same file twice is just asking for problems.
The query specifies that the destination db be locked for write and the
source db for read; which
On 27 Oct 2014, at 8:43am, Stephan Beal sgb...@googlemail.com wrote:
- a couple months back Simon suggested ATTACHing the db to itself so that
we can effectively alias main to the well-known name we have specified
for that db instance. It worked like a charm until Dave discovered this
weird
On Mon, Oct 27, 2014 at 9:58 AM, Simon Slavin slav...@bigfraud.org wrote:
On 27 Oct 2014, at 8:43am, Stephan Beal sgb...@googlemail.com wrote:
- a couple months back Simon suggested ATTACHing the db to itself so that
we can effectively alias main to the well-known name we have specified
An: General Discussion of SQLite Database
Betreff: Re: [sqlite] quasi-bug related to locking, and attached databases
On Mon, Oct 27, 2014 at 9:23 AM, Hick Gunter h...@scigames.at wrote:
SQLite treats each attached database as a separate entity. Attaching
the same file twice is just asking
On Mon, Oct 27, 2014 at 10:44 AM, Hick Gunter h...@scigames.at wrote:
How about always referencing all tables via attached db names? That way,
main is never referenced, neither explicitly nor implicitly, and is
therefore never locked.
It's looking more and more as if that's what we'll have
On Mon, Oct 27, 2014 at 11:08 AM, Stephan Beal sgb...@googlemail.com
wrote:
- TEMP tables get created in the MAIN db (assuming my memory of the docs
is correct), which means we can (though accidental misuse or carelessness)
end up filling up RAM with temporary tables (which we use regularly to
An: General Discussion of SQLite Database
Betreff: Re: [sqlite] quasi-bug related to locking, and attached databases
On Mon, Oct 27, 2014 at 11:08 AM, Stephan Beal sgb...@googlemail.com
wrote:
- TEMP tables get created in the MAIN db (assuming my memory of the
docs is correct), which means we can
On Mon, Oct 27, 2014 at 11:53 AM, Hick Gunter h...@scigames.at wrote:
TEMP tables get created in database temp; which is located in a file or
in memory depending on the SQLITE_TEMP_STORE preprocessor symbol and the
pragma temp_store.
Which reveals my ignorance on the topic ;). IIRC we aren't
On Mon, Oct 27, 2014 at 11:59 AM, Stephan Beal sgb...@googlemail.com
wrote:
On Mon, Oct 27, 2014 at 11:53 AM, Hick Gunter h...@scigames.at wrote:
TEMP tables get created in database temp; which is located in a file or
in memory depending on the SQLITE_TEMP_STORE preprocessor symbol and the
On Mon, Oct 27, 2014 at 3:23 AM, Hick Gunter h...@scigames.at wrote:
SQLite treats each attached database as a separate entity. Attaching the same
file twice is just asking for problems.
Well, it could do something to detect duplicates, but it may not be
easy (or even possible) to portably
On Mon, Oct 27, 2014 at 8:52 PM, Nico Williams n...@cryptonector.com
wrote:
Well, it could do something to detect duplicates, but it may not be
easy (or even possible) to portably detect that two DB files are the
same file.
The same is true for the application, of course, but it
seems
On Mon, Oct 27, 2014 at 3:17 PM, Stephan Beal sgb...@googlemail.com wrote:
That's conceptually the same problem we're trying to solve here: keep the
public db names stable, regardless of where/how they're actually attached.
Yes, I think that's desirable.
If it's not too much to ask for then
On 27 Oct 2014, at 9:49pm, Nico Williams n...@cryptonector.com wrote:
On Mon, Oct 27, 2014 at 3:17 PM, Stephan Beal sgb...@googlemail.com wrote:
That's conceptually the same problem we're trying to solve here: keep the
public db names stable, regardless of where/how they're actually attached.
On Mon, Oct 27, 2014 at 5:12 PM, Simon Slavin slav...@bigfraud.org wrote:
On 27 Oct 2014, at 9:49pm, Nico Williams n...@cryptonector.com wrote:
If it's not too much to ask for then SQLite3 ought to: a) check for
duplicates by canonicalized path (but keep in mind that this can be
difficult to
On Mon, 27 Oct 2014 16:49:42 -0500
Nico Williams n...@cryptonector.com wrote:
If it's not too much to ask for then SQLite3 ought to: a) check for
duplicates by canonicalized path (but keep in mind that this can be
difficult to do portably, or without obnoxious length limitations on
Windows),
On Fri, Oct 24, 2014 at 11:16 PM, Simon Slavin slav...@bigfraud.org wrote:
Which version of SQLite are you using ?
What operating system are you using (including which version) ?
What formats are the volumes those files are stored on ?
Simon, FYI: this is the 'main' db aliasing problem i
-Original Message-
From: sqlite-users-boun...@sqlite.org
[mailto:sqlite-users-boun...@sqlite.org] On Behalf Of Stephan Beal
Sent: Saturday, October 25, 2014 3:32 AM
To: General Discussion of SQLite Database
Subject: Re: [sqlite] quasi-bug related to locking,and
attached databases
Hi folks;
I may have found a locking-related bug (or not, depending on your
perspective). In my situation, I am using a system where several databases
have been attached, and I am trying to execute a query which hangs in the
busy handler, ultimately because two locks are attempted on the same
On 24 Oct 2014, at 9:54pm, dave d...@ziggurat29.com wrote:
Can locking be made more clever to know about aux being an alias
for main, and effectively translate the query shown to it's functional
equivalent of:
insert or replace into main.dest ( name, value ) values ('allow',(select
-Original Message-
From: sqlite-users-boun...@sqlite.org
[mailto:sqlite-users-boun...@sqlite.org] On Behalf Of Simon Slavin
...
On 24 Oct 2014, at 9:54pm, dave d...@ziggurat29.com wrote:
Can locking be made more clever to know about aux being an alias
for main, and effectively
On 24 Oct 2014, at 10:40pm, dave d...@ziggurat29.com wrote:
Later I can try on linux, but I don't have it at my fingertips just now. I
don't mind trying with other versions of sqlite if you think it's helpful,
but I suspect it's been there forever.
Not gonna ask for this since you've now
-Original Message-
From: sqlite-users-boun...@sqlite.org
[mailto:sqlite-users-boun...@sqlite.org] On Behalf Of Simon Slavin
Sent: Friday, October 24, 2014 4:45 PM
To: General Discussion of SQLite Database
Subject: Re: [sqlite] quasi-bug related to locking,and
attached databases
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