Recover Berkeley DB File

[Giorgos Keramidas]

On 2006-03-31 10:31, Panayotis Tsiamis <ptsiamis at fg.internet.gr> wrote:
>O/H Panayotis Tsiamis έγραψε:
>> To problima einai to exeis, kratao se bdb dns lookups
>> pou kanei o webaliser alla ana takta xronika diastimata
>> ginete corrupted. Yparxei tropos oste na mporo na ti kano recover
>> i tha anagasto na balo ena djbdns cache sto mixanaki?
>>
>> $ file dns_cache.db.old.2
>> dns_cache.db.old.2: Berkeley DB (Hash, version 8, native byte-order)
>>
>> $ db_verify dns_cache.db.old.2
>> db_verify dns_cache.db.old.2
>> db_verify: Page 860: item 128 hashes incorrectly
>> db_verify: Page 861: item 134 hashes incorrectly
>> db_verify: Page 2134: item 6 hashes incorrectly
>> db_verify: Page 2934: non-empty page in unused hash bucket 2329
>> db_verify: Page 0: page 4824 encountered a second time on free list
>> db_verify: DB->verify: dns_cache.db.old.2: DB_VERIFY_BAD: Database
>> verification failed
>>
>>
>> $ db_stat -d dns_cache.db.old.2
>> 61561   Hash magic number.
>> 8       Hash version number.
>> Flags:  little-endian
>> 4096    Underlying database page size.
>> 0       Specified fill factor.
>> 149359  Number of keys in the database.
>> 149359  Number of data items in the database.
>> 2329    Number of hash buckets.
>> 1584766 Number of bytes free on bucket pages (83% ff).
>> 0       Number of overflow pages.
>> 0       Number of bytes free in overflow pages (0% ff).
>> 778     Number of bucket overflow pages.
>> 2866515 Number of bytes free in bucket overflow pages (10% ff).
>> 0       Number of duplicate pages.
>> 0       Number of bytes free in duplicate pages (0% ff).
>> 1       Number of pages on the free list.
>
> Ma kala oute mia apantisi apo oli ti koinotita den pira se kati
> pou kanonika einai aplo gia tous "guru" tou linux pou
> apartizoun tin eliniki linux koinotita?

H eirwneia pote den einai kalos tropos na zhtas boh8eia, omws.

> Apo oti fenete oi ellhnes "veteranoi" tou unix xrisimopioun tis
> ikanotites tous mono sto kanoun ton daskalo stous kainourgious
> xristes linux kai apofeugoun tis diskoles erotiseis gia na mi
> fanoun adahs oste na exoun ena kalo profile.

An thes pragmatika na sou poume ti ftaiei, mallon prepei na mas
deikseis pws akribws "kratas se bdb dns lookups pou kanei o
webaliser".  Me kwdika, an einai dynaton.

Ta ypoloipa einai axrhstes eirwnikes malakies, kai den boh8ane idiaitera
sto na breis ti einai to problhma, opote na mas leipoun, se parakalw.