Microsoft SQL Server/Using Instances

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On one machine, there can be more editions

Default Instance: Only one. Please note some of the MS products using the SQL Server request the default instance (For instance the Team Foundation Server).

Determining Multiple or Single Instances[edit]

Multiple Instances mean more administration overhead. Additional Instances require additonal resources: Memory and processor capacity-

Advantages of multiple instances

  • testing multiple versions
  • testing service packs, dev databases and applications
  • different customers require their own system and user databases with full administrative control or their instance
  • desktop engine is embedded in the applications, because every application can install each own instance