单项选择题
A.Immediately following statement execution
B.After the ALTER TABLE DROP UNUSED COLUMNS command is issued
C.After the ALTER TABLE SET UNUSED COLUMN command is issued
D.After the ALTER TABLE MODIFY command is issued
单项选择题 TherowsinsidethreeOracletablessupportingacustomerorderentrysystemarefrequentlyaccessedtogetherbymeansofatablejoin.Becausedataisalwaysbeingaddedtothetables,youleavealotofextraspaceinsideeachblocktoaccommodategrowth.Whichofthefollowingtypesoftableswouldbeusefulforstoringthedatainthiscontext?（）
单项选择题 AtablewasjustcreatedonyourOracledatabasewithsixextentsallocatedtoit.Whichofthefollowingfactorsmostlikelycausedthetabletohavesomanyextentsallocated?（）
单项选择题 YouarecreatingtablespacesinOracle.Whichofthefollowingkeywordsorclausespermitsthedatafilesofadatabasetogrowautomaticallyinordertoaccommodatedatagrowth?（）