備忘録．
ふむ．db2 以上の format は (今のところ) 互換性があると思って良さそうかしら．
Berkeley DB Reference Guide: The db_dump and db_load utilities (at Sleepycat Software)
The db_dump and db_dump185 utilities dump Berkeley DB databases into a flat-text representation of the data that can be read by db_load. The only difference between them is that db_dump reads Berkeley DB version 2 and greater database formats, whereas db_dump185 reads Berkeley DB version 1.85 and 1.86 database formats.
少なくとも db1.85 以外は，最悪でも db_upgrade するか，db_dump oldfile.db | db_load newfile.db で問題なさそうだ，と．
というか header file 内での定義を見る限りではオッケーそう．
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備忘録補足．btree だと：
db2 (2.4.24):
#define DB_BTREEVERSION 6 /* Current btree version. */
#define DB_BTREEOLDVER 6 /* Oldest btree version supported. */
#define DB_BTREEMAGIC 0x053162
db3 (3.2.9):
#define DB_BTREEVERSION 8 /* Current btree version. */
#define DB_BTREEOLDVER 6 /* Oldest btree version supported. */
#define DB_BTREEMAGIC 0x053162
db4 (4.0.14):
#define DB_BTREEVERSION 8 /* Current btree version. */
#define DB_BTREEOLDVER 6 /* Oldest btree version supported. */
#define DB_BTREEMAGIC 0x053162
同様に hash 等も ok みたい．