多项选择题
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
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相关考题
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多项选择题
Whichtwostatementscorrectlydescribetherelationbetweenadatafileandthelogicaldatabasestructures（）
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. -
单项选择题
ote the following structures in your database server： 1：Extents 2：OS Blocks 3：Tablespace 4：Segments 5：Oracle Data Block Which option has the correct arrangement of these structures from the smallest to the largest（）
A.2， 5， 1， 4， 3
B.1， 2， 3， 4， 5
C.5， 2， 1， 3， 4
D.2， 1， 5， 4， 3 -
单项选择题
Identifythelogicalstructurethatwillneverhavemorethanonedatasegmentcreatedforit.（）
A.external table
B.partitioned table
C.partitioned index
D.nonclustered table
E.global temporary table
