The phrase "a main database" is correct and usable in written English.
It can be used when referring to the primary or most important database in a system or application.
Example: "The application relies on a main database to store all user information and transaction records."
Alternatives: "a primary database" or "a central database".
The information system, named Cystic Fibrosis Cloud database is available on the http://servoy.infocomsa.com/cfc_database site and is composed of a main database and a web-based interface, which uses Servoy's product architecture based on Java technology.
"So for example, when you ask Siri what the weather is like in Nashville, Tenn., it plays an elaborate game of telephone with a main database of information and then updates you with the answer".
The guide has two components: a main database of more than 160 antibiotics, which can be searched by entering a search term or by choosing a drug name, diagnosis or pathogen; and a feature area including news of recent journal articles, reports, and a question-and-answer forum.
The OLEA EST database consists of a main relational database (MySQL) which collects raw as well as processed data generated by ParPEST.
The SQL*Cache scheme is currently being implemented using a main memory database as the client-side cache, and commercial database servers as the backends.
I.B.M. unveiled a new version of its main database product with improved features that analyze data better, so customers can see trends more easily and provide their suppliers with select information.
Blogging platform JournalSpace (which I'd never heard of to date) has ceased to be, following a wipe-out of the main database for which there was no back-up in place.
Regional statistical data and land use data on a raster basis form the main database for the model framework.
The next step consisted in repeating a merging procedure between the main database and two additional files containing maternal and fetal ICD codes and their associated subcategory, for each of the eight potential diagnoses per case.
The last time the site was down for any length of time was in 2010, when an error in error checking software brought down the main database for two and a half hours.
This activity (which we've corrected) had an affect of overloading our main database, resulting in the error pages and slowness most people are now encountering.
