the.forumer wrote in post #16277477
yup, i usually use a single catalog. created multiple catalogs this time because i have too many photos (10k+) to edit, and it becomes messy if it's all under one roof.
any advice i can use to dig out the right catalog then?

Well, first off I'd keep everything in one "master" catalog. That way you can find things easily, using keywords and/or collections, or any useful ways.
Once things are in separate catalogs, well, unless you have applied keywords to the actual image files, or have given identifiable names to the files and/or the folders, well, I dunno! I guess you'd have to either open each catalog in LR or open the folders in your file browser (with viewing thumbnails on) in order to find what you're looking for!
I have about 50,000 images in my LR catalog. The files are in my external "library" hard drive, organized into yearly "parent" folders, and then into specific "shoot" date/name folders. My Lightroom Collections are partly a "mirror" of that organization and then also a breakdown of categories of shoots. I also have keywords applied. With this approach things are pretty easy to find. Also, LR displays things ordered by your Capture time if you wish (the default). So, I've occasionally resorted to just viewing "All Photographs" and finding something from a specific time.
But if you are going to use separate catalogs, make sure you name things properly!