int DB->set_re_len(DB *db, u_int32_t re_len);
For the Queue access method, specify that the records are of length re_len.
For the Recno access method, specify that the records are fixed-length, not byte-delimited, and are of length re_len.
Any records added to the database that are less than re_len bytes long are automatically padded (see DB->set_re_pad for more information).
Any attempt to insert records into the database that are greater than re_len bytes long will cause the call to fail immediately and return an error.
The DB->set_re_len interface may be used only to configure Berkeley DB before the DB->open interface is called.
The DB->set_re_len function returns a non-zero error value on failure and 0 on success.
The DB->set_re_len function may fail and return a non-zero error for the following conditions:
Called after DB->open was called.
The DB->set_re_len function may fail and return a non-zero error for errors specified for other Berkeley DB and C library or system functions. If a catastrophic error has occurred, the DB->set_re_len function may fail and return DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail in the same way.
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