afd25ced_File_Format_Changes_in_SQLite__cription_Of_File_Format_Change
[Version Change] 2.5.6 to 2.6.0 [Approx. Date] 2002-July-17
A design flaw in the layout of indices required a file format change to correct. This change appeared in version 2.6.0. If you use version 2.6.0 or later of the library to open a database file that was originally created by version 2.5.6 or earlier, an attempt to rebuild the database into the new format will occur automatically. This can take some time for a large database. (Allow 1 or 2 seconds per megabyte of database under Unix - longer under Windows.) This format conversion is irreversible. It is strongly suggested that you make a backup copy of older database files prior to opening them with version 2.6.0 or later of the library, in case there are errors in the format conversion logic. Version 2.6.0 or later of the library cannot open read-only database files from version 2.5.6 or earlier, since read-only files cannot be upgraded to the new format.
File Format Changes in SQLite