I have an article linked with a very_big.bib file. To cite any reference in the article, I use \citet{reference_key}. However, to get the reference key I need to search very_big.bib file, which is not very time-efficent solution. I know that some TeX editors, like TeXstudio, have code completion option, that gives you a suggestions for the reference keys. But I'm using Latexian editor, which doesn't have this option (although it has neat code completion for other things).
So I'm wondering whether you use other solutions then code completion for fast access to very_big.bib files in order to get your reference key for citation?