The phrase "a database of thousands" is correct and usable in written English.
You can use it when referring to a collection of data that contains a large number of entries or records.
Example: "The research team has created a database of thousands of species to aid in biodiversity studies."
Alternatives: "a collection of thousands" or "a repository of thousands".
WikiLeaks released a database of thousands of Clinton's emails in March that year, obtained through a freedom of information request.
The police operation which has been penetrating political groups for 40 years has been compiling a database of thousands of activists around the country.
A database of thousands of prints and book illustrations from early modern Britain in fully-searchable form, with ancillary facilities aimed to enhance understanding and appreciation of the material it presents, such as various resources contextualising prints and printmaking, as well as original research on British prints to 1700.
The 3D scanner connects with a database of thousands of small screws and hinges.
A hacker has exploited Facebook's Graph Search to collect a database of thousands of phone numbers and Facebook users.
The site offers a database of thousands of foods, allowing you to quickly figure out how many calories you've eaten throughout the day.
Last year, companies claimed they could compare live feeds to a database of billions of faces.
Indigo has built a database of tens of thousands of individual microbes isolated from crops that thrive under harsh conditions.
A team led by Markus Schläpfer of the Massachusetts Institute of Technology in Cambridge used a database of billions of telephone calls from Portugal and the United Kingdom to measure social connectivity.
So far, Dima has helped to build a database of hundreds of thousands of small molecules and proteins, detailing their chemical structures and binding properties.
The images used were acquired from a database of three-dimensional head models created by researchers at the Max Planck Institute in Tübingen, Germany54,55,56.
