多項選擇題

Which two statements are true regarding undo tablespaces（）

A.The database can have more than one undo tablespace.
B.The UNDO_TABLESPACE parameter is valid in both automatic andmanualundo management.
C.Undo segments automatically grow and shrink as needed， acting as circular storage buffer for their assigned transactions.
D.An undotablespaceis automatically created if the UNDO_TABLESPACEparameter is not set and the UNDO_MANAGEMENT parameter is set to AUTO during the database instance start up.

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多項選擇題

Which three operations require undo data（）

A.committing a transaction
B.flashing back a transaction
C.recovering a failed transaction
D.running a read-consistent query
E.changing a tablespace status from READ ONLY to READ WRITE

多項選擇題

Which two statements correctly describe the relation between a data file and the logical databasestructures（）

A.An extent cannot spread across data files.
B.A segment cannot spread across data files.
C.A data file can belong to only one tablespace.
D.A data file can have only one segment created in it.
E.A data block can spread across multiple data files as it can consist of multiple operating system （OS） blocks.

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Which two statements are true regarding undo tablespaces（）

你可能感興趣的試題

Which three operations require undo data（）

Which two statements correctly describe the relation between a data file and the logical databasestructures（）

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