DB->set_h_nelem
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#include <db.h>
int
DB->set_h_nelem(DB *db, u_int32_t h_nelem);
Description
Set an estimate of the final size of the hash table.
If not set or set too low, hash tables will still expand gracefully
as keys are entered, although a slight performance degradation may be
noticed.
The DB->set_h_nelem interface may only be used to configure Berkeley DB before
the DB->open interface is called.
The DB->set_h_nelem function returns a non-zero error value on failure and 0 on success.
Errors
- EINVAL
- An invalid flag value or parameter was specified.
Called after DB->open was called.
See Also
db_create,
DB->close,
DB->cursor,
DB->del,
DB->err,
DB->fd,
DB->get,
DB->get_byteswapped,
DB->get_type,
DB->join,
DB->key_range,
DB->open,
DB->put,
DB->remove,
DB->set_bt_compare,
DB->set_bt_minkey,
DB->set_bt_prefix,
DB->set_cachesize,
DB->set_dup_compare,
DB->set_errcall,
DB->set_errfile,
DB->set_errpfx,
DB->set_flags,
DB->set_h_ffactor,
DB->set_h_hash,
DB->set_h_nelem,
DB->set_lorder,
DB->set_malloc,
DB->set_pagesize,
DB->set_paniccall,
DB->set_q_extentsize,
DB->set_realloc,
DB->set_re_delim,
DB->set_re_len,
DB->set_re_pad,
DB->set_re_source,
DB->stat,
DB->sync,
DB->upgrade
and
DB->verify.
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