How can I recreate 'dir' for shelve db

Question

Everyday I store data to one shelve file . Today I discovered some last keys missing. The dat-file size is not changed. The dir file and the bak file contains all keys except some last keys. How can I recreate this files, or how can I rescan my dat file and restore all stored items?

Answer 1

I solved my problem by hex editor and hands. There is simple steps:

1. open dat file with hex editor.

2. open our dir file

3. find data offset. It should be 0. This is offset 1. Fig 1

4. find block of ten zero and find the offset at start of this block. This is offset 2. Fig 2

5. substract offset 1 from offset 2. In my case it be 71768182 - 0 = 71768182. This is data length.

6. We should write to dir file: '1', (0, 71768182)

   • 1 - key of this item in our db.

   • 0 - offset of start datablock

   • 71768182 - length of datablock;

7. Go to start of the new datablock. Fig 3

8. Go to step 3