# Method Yabu.LookupDB()->create()

Method create

  `Yabu.LookupDB Yabu.LookupDB(`string` `dir`, `string` `mode`, `mapping`|`void` `options`)`

Description

  Construct a new lookup table.

  The `options`, if present, can be used to specify the index hash size. The bigger that number is, the less memory will be used given a certain number of actual keys. In general, using the expected number of entries in the database divided by 100-1000 is reasonable.

  The supported options are

  ``index_size` : `int(1..)``