Understanding Projector Dbs

Understanding Projector Databases by Ron Karr (with modifications by Greg Branche) Apple Computer, Inc. gregb@apple.com Purpose of this document . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 The structure of Projector databases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Page-level data..............................................................................................................................4 Page Zero .................................................................................................................................... 4 Page 1 (Bitmap)............................................................................................................................ 5 Page 2 & Beyond .......................................................................................................................... 6 The hierarchy of record types.......................................................................................................7 Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Tools useful in diagnosing problems ........................................................................................... 10 DumpDB................................................................................................................................... 10 DumpProject.............................................................................................................................. 15 ProjVerify ................................................................................................................................. 16 DumpFile .................................................................................................................................. 18 ProjectInfo................................................................................................................................. 18 A disk editor (e.g. FEdit, Norton Utilities) ....................................................................................... 18 Causes of corruption................................................................................................................... 19 Header files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 ProjID.h...................................................................................................................................... 20 recmgr.h ..................................................................................................................................... 21 recMgrPriv.h …