Documenting your search can help you keep track of what you have done so that you can reproduce your results at a later stage. It can help you to describe your search process to others, and it can justify the choices you made in the search process. Documenting searches can furthermore help you to stay organized, and remember what did and did not work, and thus perhaps save you some time.
The objective of a logbook is to record information about your data search. The logbook should be sufficiently detailed to allow you (or someone else) to use it in order to reproduce your results. This can help you to adjust keywords, filters and inclusion and exclusion criteria to fit the requirements of the database.
You can document the following during your search process:
When you have found datasets, you can document the following:
In the column on the left you can find an example of a data search logbook.
You should cite datasets for the same reasons as journal articles and other types of publications: to acknowledge the original author/producer and to help others find your sources.
A dataset citation includes all of the same components as any other citation:
The repository/archive hosting the dataset may provide citation guidelines.