Re: [sqlite] Extrange files
On 3/2/06, Paul G <[EMAIL PROTECTED]> wrote: > From: "Nuno Lucas" <[EMAIL PROTECTED]> > > The only problem is that it can be a race condition between the > > closing of the handle and the actual delete command (because you can't > > delete an open file on win world). > > you lie! if the file is opened with the delete sharemode set, it can be > 'deleted' while open. in this case, it will be *really* deleted when the > refcount drops to 0, iirc. besides, these hoops don't need to be jumped > through if you're the process that issued the original CreateFile(), again > iirc. You're right, off course. When I wrote that I was only thinking on Windows CE, which don't implement the FILE_SHARE_DELETE mode (at least for CE <=4.2, not sure about the 5.0 version). But note that the flag only exists on NT, not on Win9x (which can be considered obsolete now, but was important enough to make me never use it before). Best regards, ~Nuno Lucas
Re: [sqlite] Extrange files
- Original Message - From: "Nuno Lucas" <[EMAIL PROTECTED]> To: <sqlite-users@sqlite.org> Sent: Wednesday, March 01, 2006 10:36 PM Subject: Re: [sqlite] Extrange files The only problem is that it can be a race condition between the closing of the handle and the actual delete command (because you can't delete an open file on win world). you lie! if the file is opened with the delete sharemode set, it can be 'deleted' while open. in this case, it will be *really* deleted when the refcount drops to 0, iirc. besides, these hoops don't need to be jumped through if you're the process that issued the original CreateFile(), again iirc. -p
Re: [sqlite] Extrange files
On 3/1/06, Ralf Junker <[EMAIL PROTECTED]> wrote: > > >But I do not think that DOS has the ability > >to automatically delete a file when it is closed, so the > >files remain on disk after SQLite has finished with them. > > Just a thought: > > Wouldn't it possible to have SQLite thoughtfully delete all files it creates > when closing the database instead of relying on the operating system? > > I am not sure, but there might be plenty of OSes besides DOS that do not > automatically delete temporary files. That's what the Windows CE port does, and I think I remember it's also done on the Mac port (don't have the code in front of me and never developed for a Mac). The only problem is that it can be a race condition between the closing of the handle and the actual delete command (because you can't delete an open file on win world). In the case of Windows CE, that risk is negligible. It would be even less for DOS (last time I checked DOS wasn't multi-task, if we exclude TSR's). On (desktop) windows, this will not be so true, because of things like anti-virus that open a file for scaning as soon as they are closed, making the next delete to fail (but only sometimes and never on the developper machine ;-). > Ralf Best regards, ~Nuno Lucas
Re: [sqlite] Extrange files
On Wed, 1 Mar 2006, RalfJunker wrote: [...] Wouldn't it possible to have SQLite thoughtfully delete all files it creates when closing the database instead of relying on the operating system? [...] Hello, that would probably be possible, but not very efficient as you would have to keep a list of formerly used filenames around associated with the database handle. Also SQLite3 does delete the temporary files, but I think (without having looked into the source now) it does so immediately after opening them as it is common good programming practice. I don't think DOS supports this approach, though. cu, Thomas
Re: [sqlite] Extrange files
>But I do not think that DOS has the ability >to automatically delete a file when it is closed, so the >files remain on disk after SQLite has finished with them. Just a thought: Wouldn't it possible to have SQLite thoughtfully delete all files it creates when closing the database instead of relying on the operating system? I am not sure, but there might be plenty of OSes besides DOS that do not automatically delete temporary files. Ralf
RE: [sqlite] Extrange files
It works You're great! Thanks a lot -Mensaje original- De: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Enviado el: dimecres, 1 / març / 2006 16:03 Para: sqlite-users@sqlite.org; [EMAIL PROTECTED] Asunto: Re: [sqlite] Extrange files =?iso-8859-1?Q?Josep_Llu=EDs_Vaquer?= <[EMAIL PROTECTED]> wrote: > I'm running DOS, Sqlite version 3.2.8. Attached example files > The mailing list handler automatically strips attachments so they did not get through. The files you are seeing are probably temporary databases that SQLite creates to support its internal processing. Such temporary databases are automatically deleted on unix and windows. But I do not think that DOS has the ability to automatically delete a file when it is closed, so the files remain on disk after SQLite has finished with them. To fix this, you might consider compiling SQLite so that it stores temporary databases in memory rather than on disk. Do so with this compile-time option: -DTEMP_STORE=2 You can do this at runtime using a pragma: PRAGMA temp_store=MEMORY; -- D. Richard Hipp <[EMAIL PROTECTED]> -- Este mensaje ha sido analizado mediante ABServer Antivirus System http://www.abserver.es/antivirus/panel.htm -- Este mensaje ha sido analizado mediante ABServer Antivirus System http://www.abserver.es/antivirus/panel.htm
Re: [sqlite] Extrange files
=?iso-8859-1?Q?Josep_Llu=EDs_Vaquer?= <[EMAIL PROTECTED]> wrote: > I'm running DOS, Sqlite version 3.2.8. Attached example files > The mailing list handler automatically strips attachments so they did not get through. The files you are seeing are probably temporary databases that SQLite creates to support its internal processing. Such temporary databases are automatically deleted on unix and windows. But I do not think that DOS has the ability to automatically delete a file when it is closed, so the files remain on disk after SQLite has finished with them. To fix this, you might consider compiling SQLite so that it stores temporary databases in memory rather than on disk. Do so with this compile-time option: -DTEMP_STORE=2 You can do this at runtime using a pragma: PRAGMA temp_store=MEMORY; -- D. Richard Hipp <[EMAIL PROTECTED]>
RE: [sqlite] Extrange files
I'm running DOS, Sqlite version 3.2.8. Attached example files -Mensaje original- De: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Enviado el: dimecres, 1 / març / 2006 13:32 Para: sqlite-users@sqlite.org Asunto: Re: [sqlite] Extrange files =?iso-8859-1?Q?Josep_Llu=EDs_Vaquer?= <[EMAIL PROTECTED]> wrote: > Hi, I'm new in Sqlite. > > I'm trying to develop an aplication using Sqlite and it started to > work fine. I did a relatively simple Schema and builded a few views to > access easily. The problem started when I tried to access at one of > those views (only in one of those). Each select I do to this view > creates a couple of files in the main directory named SQLITE_ followed by a number or a letter. > When in this directory are a few of those apparently empty files > Sqlite stops working. > > My answer is: why are those files generated? And what can I do to > solve this problem? > What OS are you running? What version of SQLite are you using? Can you show me specific examples of the name of the files that are being generated? -- D. Richard Hipp <[EMAIL PROTECTED]> -- Este mensaje ha sido analizado mediante ABServer Antivirus System http://www.abserver.es/antivirus/panel.htm
Re: [sqlite] Extrange files
=?iso-8859-1?Q?Josep_Llu=EDs_Vaquer?= <[EMAIL PROTECTED]> wrote: > Hi, I'm new in Sqlite. > > I'm trying to develop an aplication using Sqlite and it started to work > fine. I did a relatively simple Schema and builded a few views to access > easily. The problem started when I tried to access at one of those views > (only in one of those). Each select I do to this view creates a couple of > files in the main directory named SQLITE_ followed by a number or a letter. > When in this directory are a few of those apparently empty files Sqlite > stops working. > > My answer is: why are those files generated? And what can I do to solve > this problem? > What OS are you running? What version of SQLite are you using? Can you show me specific examples of the name of the files that are being generated? -- D. Richard Hipp <[EMAIL PROTECTED]>
[sqlite] Extrange files
Hi, I'm new in Sqlite. I'm trying to develop an aplication using Sqlite and it started to work fine. I did a relatively simple Schema and builded a few views to access easily. The problem started when I tried to access at one of those views (only in one of those). Each select I do to this view creates a couple of files in the main directory named SQLITE_ followed by a number or a letter. When in this directory are a few of those apparently empty files Sqlite stops working. My answer is: why are those files generated? And what can I do to solve this problem? I'll thank any help JOSEP LLUÍS VAQUER R Department [EMAIL PROTECTED] Tel. (0034) 977 84 56 11 FAX. (0034) 977 84 57 56 Grupo Turomas
