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［A］ loaf ［B］ feather ［C］ leaf ［D］ fog
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Dense fog comes with bad visibility, fog signal bell must be kept ________at regulation intervalsA.to goB.goingC.goesD.go
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An important part of the national government is the Foreign Service,a branch of the Department of State.A:tree B:division C:root D:leaf
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Which two statements are true regarding B-tree indexs（）A、The leaf blocks in the index are doubly linked.B、The leaf node stores a bitmap for each key value.C、The rows with NULL value in key columns also have entries in the index.D、The deletion of a row from the table causes a logical deletion in index leaf block and the space becomesavailable for the new leaf entry
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As a result of performance analysis， you created an index on the prod_name column of the prod_det table， which contains about ten thousand rows. Later， you updated a product name in the table. How does this change affect the index？（）A、A leaf will be marked as invalid.B、An update in a leaf row takes place.C、The index will be updated automatically at commit.D、A leaf row in the index will be deleted and inserted.E、The index becomes invalid when you make any updates.
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Which statement describes the effect on an index， when the indexed column for the rows is updatedin the base table（）A、An update in a leaf row takes place.B、The index becomes invalid after the update.C、The leaf block containing the row to be updated is marked as invalid.D、A row in the leaf block of the index for the key value is logically deleted and a new leaf row is inserted
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You work as a database administrator for Certkiller .com. As a result of performance analysis， you created an index on theprod_namecolumn of the Certkiller prodtable， which contains about ten thousand rows. Later， you updated a product name in the table. How does this change affect the index？（）A、A leaf will be marked as invalid.B、An update in a leaf row takes place.C、The index will be updated automatically at commit.D、A leaf row in the index will be deleted and inserted.E、The index becomes invalid when you make any updates
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Which two statements are true regarding B-tree index（）A、The leaf blocks in the index are doubly linked.B、The leaf node stores a bitmap for each key value.C、The rows with NULL value in key columns also have entries in the index.D、The deletion of a row from the table causes a logical deletion in index leaf block and the space becomes available for the new leaf entry.
考题
单选题Which statement describes the effect on an index， when the indexed column for the rows is updatedin the base table（）A
An update in a leaf row takes place.B
The index becomes invalid after the update.C
The leaf block containing the row to be updated is marked as invalid.D
A row in the leaf block of the index for the key value is logically deleted and a new leaf row is inserted
考题
单选题The ship should reduce speed in the thick fog because of（）.A
the poor visibilityB
the fog signalsC
the fast speedD
the good sight
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单选题The SCOTT user has an index on the ITEM_DESC column of the ITEM table. As part of the year-ending task， SCOTT updates the ITEM_DESC column for most of the rows in the ITEM table. How does this change to the table affect the index？（）A
An update in a leaf row takes place.B
The index becomes invalid after the update.C
The leaf block containing the row to be updated is marked as invalid.D
A row in the leaf block of the index for the key value is deleted and inserted.
考题
单选题What is the use of the books of Admiralty List of Lights and Fog Signals? Their use is to （）.A
Mention signal stations and ice，storm，traffic and port signalsB
Give the international numbers of lightsC
Give the correction of the lights and fog signalsD
Give the information on the lights and fog signals
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单选题The fog most commonly encountered at sea is called（）.A
conduction fogB
radiation fogC
frontal fogD
advection fog
考题
多选题Which two statements are true regarding B-tree index（）AThe leaf blocks in the index are doubly linked.BThe leaf node stores a bitmap for each key value.CThe rows with NULL value in key columns also have entries in the index.DThe deletion of a row from the table causes a logical deletion in index leaf block and the space becomes available for the new leaf entry.
考题
单选题Which kind of fog is also named as ground fog?（）A
AdvectionB
Radiation fogC
frontal fogD
Steam fog
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单选题A combination or all-purpose nozzle produces（）.A
low-velocity fog onlyB
a solid stream onlyC
a solid stream and foamD
a solid stream and fog
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多选题Which two statements are true regarding B-tree indexs（）AThe leaf blocks in the index are doubly linked.BThe leaf node stores a bitmap for each key value.CThe rows with NULL value in key columns also have entries in the index.DThe deletion of a row from the table causes a logical deletion in index leaf block and the space becomesavailable for the new leaf entry
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判断题在WDS组网中一个Root AP可以连接多个Leaf AP，但是一个Leaf AP只能连接一个Root AP。A
对B
错
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