'Recommended: Express Editions: 1 GB All other editions: At least 4 GB and should be increased as database size increases to ensure optimal performance.' ). The limit applies per database (log files excluded) but in some scenarios users can access more data through the use of multiple interconnected databases. Differences in the Express product include:
However it has technical restrictions that make it unsuitable for some large-scale deployments. SQL Server Express provides many of the features of the paid, full versions of Microsoft SQL Server database management system.
