So, is imposible to read alway and write one per time... ?
On 7/25/06, Cesar David Rodas Maldonado <[EMAIL PROTECTED]> wrote:
I just want to read always and write one time.. understand? is that imposible? On 7/25/06, Robert Simpson <[EMAIL PROTECTED] > wrote: > > > -----Original Message----- > > From: Cesar David Rodas Maldonado [mailto: [EMAIL PROTECTED] > > Sent: Tuesday, July 25, 2006 8:07 AM > > To: sqlite-users@sqlite.org > > Subject: [sqlite] Sqlite Write and read a the same time > > > > Hello! > > > > The weekend I was reading a book "Programming in Linux" and I found > > something for me very cool!. I so that you could Lock a File > > for write but > > just a part of the file. And I am wondering if in Linux > > SQLite would be able > > to lock just a Page of the B-tree when you are doing the > > insert and the > > update, that will be better I think that Lock all the File (database). > > > > The function is in the header < fcntl.h> and the function is: > > > > int fcntl(int fd, int cmd, struct flock *lock_type); > > > > The problem is that when SQLite is updating, it needs to lock a lot more > than just the page its updating. > > When pages are moved, rewritten, added, etc, all the references need to > be > written. The master pages need updating. You can't update all those > other > pages during a write op and expect readers to continue to be able to > read in > a consistent state. > > Robert > > >
