Meaning of the prefix "dbo" in SQL Server:\nJudge the statement:\n\n'"dbo" stands for database object.'

Difficulty: Easy

Correct Answer: Incorrect

Explanation:


Introduction / Context:
In SQL Server, object names are often schema-qualified (schema.object). The default schema for many operations is dbo. Misunderstanding what “dbo” stands for can cause confusion around ownership, permissions, and name resolution.


Given Data / Assumptions:

  • We refer to standard SQL Server nomenclature.
  • Objects like dbo.TableName appear throughout databases.
  • Schemas and users/roles are part of the security model.


Concept / Approach:
The identifier “dbo” is an abbreviation for database owner, not database object. Historically, dbo was the owner principal for the database. Today, dbo is also a schema name mapped to that owner context. Qualifying an object with dbo (e.g., dbo.Customers) places it in the dbo schema, which affects default resolution and can avoid ownership-chaining issues. It does not mean “database object.”


Step-by-Step Solution:

Observe object naming: schema.object, e.g., dbo.Sales.Check security: the dbo principal has full permissions within the database.Understand schema behavior: default schema for many logins is dbo; two users can have tables with the same base name in different schemas.


Verification / Alternative check:
Query sys.schemas and sys.database_principals to see dbo entries; review documentation on ownership and schemas.


Why Other Options Are Wrong:

  • Correct claims conflate schema name with a generic phrase; dbo is specific to ownership.
  • Master/Azure caveats: Meaning is consistent across databases and deployment models.


Common Pitfalls:
Assuming dbo is merely a prefix; neglecting to set default schema for users; mixing owner and schema concepts.


Final Answer:
Incorrect

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