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 Queue access method, the record length must be enough smaller than the database's page size that at least one record plus the database page's metadata information can fit on each database page.
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 method configures a database, not only operations performed using the specified DB handle.
The DB->set_re_len interface may not be called after the DB->open interface is called. If the database already exists when DB->open is called, the information specified to DB->set_re_len will be ignored.
The DB->set_re_len method returns a non-zero error value on failure and 0 on success.
The DB->set_re_len method may fail and return a non-zero error for the following conditions:
Called after DB->open was called.
The DB->set_re_len method 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 method may fail and return DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail in the same way.
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