strangelly, I affected a lot of tags to a lot of photos.
I had just once this problem, never after and never before.
Sorry but I just can't precise what was particular in this action compared to others.

I precise : I wasn't accessing to the database at the same time (as far as I know), so I don't undestand why it was blocked.

xavier
----------------

Une exception non traitée a été levée : The database is locked.

  at Mono.Data.SqliteClient.SqliteCommand.ExecuteStatement (IntPtr pStmt, System.Int32& cols, System.IntPtr& pazValue, System.IntPtr& pazColName) [0x00000] 
  at (wrapper remoting-invoke-with-check) Mono.Data.SqliteClient.SqliteCommand:ExecuteStatement (intptr,int&,intptr&,intptr&)
  at Mono.Data.SqliteClient.SqliteDataReader.ReadpVm (IntPtr pVm, Int32 version, Mono.Data.SqliteClient.SqliteCommand cmd) [0x00000] 
  at Mono.Data.SqliteClient.SqliteDataReader..ctor (Mono.Data.SqliteClient.SqliteCommand cmd, IntPtr pVm, Int32 version) [0x00000] 
  at (wrapper remoting-invoke-with-check) Mono.Data.SqliteClient.SqliteDataReader:.ctor (Mono.Data.SqliteClient.SqliteCommand,intptr,int)
  at Mono.Data.SqliteClient.SqliteCommand.ExecuteReader (CommandBehavior behavior, Boolean want_results, System.Int32& rows_affected) [0x00000] 
  at Mono.Data.SqliteClient.SqliteCommand.ExecuteReader (CommandBehavior behavior) [0x00000] 
  at Mono.Data.SqliteClient.SqliteCommand.ExecuteReader () [0x00000] 
  at Mono.Data.SqliteClient.SqliteCommand.ExecuteScalar () [0x00000] 
  at Db.CommitTransaction () [0x00000] 
  at MainWindow.AttachTags (.Tag[] tags, System.Int32[] ids) [0x00000] 
  at MainWindow.HandleIconViewDragDataReceived (System.Object sender, Gtk.DragDataReceivedArgs args) [0x00000] 
  at (wrapper delegate-invoke) System.MulticastDelegate:invoke_void_object_DragDataReceivedArgs (object,Gtk.DragDataReceivedArgs)
  at Gtk.Widget.DragDataReceivedSignalCallback (IntPtr arg0, IntPtr arg1, Int32 arg2, Int32 arg3, IntPtr arg4, UInt32 arg5, UInt32 arg6, IntPtr gch) [0x00000] 
  at (wrapper native-to-managed) Gtk.Widget:DragDataReceivedSignalCallback (intptr,intptr,int,int,intptr,uint,uint,intptr)
  at <0x00000> <unknown method>
  at (wrapper managed-to-native) Gtk.Application:gtk_main ()
  at Gtk.Application.Run () [0x00000] 
  at Gnome.Program.Run () [0x00000] 
  at FSpot.Driver.Main (System.String[] args) [0x00000] 
.NET Version: 2.0.50727.42

Assembly Version Information:

System.Xml (2.0.0.0)
libgphoto2-sharp (1.0.2649.19572)
google-sharp (0.1.0.0)
FlickrNet (2.1.2.19557)
SmugMugNet (0.0.0.0)
pango-sharp (2.10.0.0)
SemWeb (0.7.1.0)
glade-sharp (2.10.0.0)
gtkhtml-sharp (2.16.0.0)
System.Transactions (2.0.0.0)
gconf-sharp (2.16.0.0)
System.Data (2.0.0.0)
Mono.Data.SqliteClient (2.0.0.0)
gdk-sharp (2.10.0.0)
gnome-vfs-sharp (2.16.0.0)
NDesk.DBus.GLib (1.0.0.0)
NDesk.DBus (1.0.0.0)
System (2.0.0.0)
Mono.Posix (2.0.0.0)
atk-sharp (2.10.0.0)
gtk-sharp (2.10.0.0)
glib-sharp (2.10.0.0)
gnome-sharp (2.16.0.0)
f-spot (0.3.5.0)
Mono.GetOptions (2.0.0.0)
mscorlib (2.0.0.0)

Platform Information: Linux 2.6.20-16-generic i686 unknown GNU/Linux

Distribution Information:

[/etc/debian_version]
4.0

[/etc/lsb-release]
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=7.04
DISTRIB_CODENAME=feisty
DISTRIB_DESCRIPTION="Ubuntu 7.04"