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I am building a new database server that should host many databases serving many applications. I have two strategies to setup the server but am still undecided. which one should I use for better utilization.<br />
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1. Single instance that host ALL the databases<br />
2. Multiple instances identifies with each having subset of the databases.
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I am building a new database server that should host many databases serving many applications. I have two strategies to setup the server but am still undecided. which one should I use for better utilization.

1. Single instance that host ALL the databases
2. Multiple instances identifies with each having subset of the databases.

Which is better to go either SQL Server multiple Instances each have a database or Multiple databases in single instance.

SQL (Structured Query Language) is designed to be used in conjunction with relational database products as of a means of working with sets of data. SQL consists of data definition, data manipulation, and procedural elements. Its scope includes data insert, query, update and delete, schema creation and modification, and data access control.

Databases are organized collections of data, most commonly accessed through management systems including schemas, tables, queries and processes that allow users to enter and manipulate the information or utilize it in other fashions, such as with web applications or for reporting purposes.

Databases

Microsoft SQL Server is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.SQL Server is available in multiple versions, typically identified by release year, and versions are subdivided into editions to distinguish between product functionality. Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning.

Microsoft SQL Server

MongoDB (from humongous) is a free and open-source cross-platform document-oriented database program. Classified as a NoSQL database program, MongoDB uses JSON-like documents with schemas. MongoDB is developed by MongoDB Inc. and is free and open-source, published under a combination of the GNU Affero General Public License and the Apache License.