单项选择题
Table TAB1 was created using the following statement: CREATE TABLE tab1 (c1 INT, c2 INT, c3 INT, c4 INT, c5 INT); If column C1 is unique and queries typically access columns C1 and C2 together, which statement(s) will create index(es) that will provide optimal query performance? （）
A. CREATE UNIQUE INDEX xtab1 ON tab1 (c1) include (c2)
B. CREATE UNIQUE INDEX xtab1 ON tab1 (c1); CREATE INDEX xtab2 ON tab1 (c3) INCLUDE (c2)
C. CREATE UNIQUE INDEX xtab1 ON tab1 (c2, c1)
D. CREATE UNIQUE INDEX xtab1 ON tab1 (c2) INCLUDE (c1）
相关考题
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单项选择题
Whenistheconnectionconcentratorenabled?（）
A.When the value of MAX_CONNECTIONS is greater than the value of MAX_COORDAGENTS.
B.When the value of MAX_AGENTS is greater than the value of MAX_CLIENTS.
C.When the value of NUM_AGENTS is greater than the value of MAX_AGENTS.
D.When the value of NUM_CONNECTIONS is greater than the value of NUM_COORDAGENTS. -
单项选择题
Whichaction(s)willcauseacompressiondictionarytoberemovedfromatable?（）
A.Set the table COMPRESS attribute to NO.
B.Set the table COMPRESS attribute to NO; run REORG against the table.
C.Set the table COMPRESS attribute to NO; run INSPECTRESETDICTIONARY against the table.
D.Set the table COMPRESS attribute to NO; run RUNSTATS against the table. -
单项选择题
TableTAB1wascreatedusingthefollowingstatement:CREATETABLEtab1(c1INT,c2INT,c3INT,c4INT,c5INT);IfcolumnC1isuniqueandqueriestypicallyaccesscolumnsC1,C2andC3together,whichstatement(s)willcreateindex(es)thatwillprovideoptimalqueryperformance?（）
A.CREATE UNIQUE INDEX xtab1 ON tab1 (c1); CREATE INDEX xtab2 ON tab1 (c2) INCLUDE (c3)
B.CREATE UNIQUE INDEX xtab1 ON tab1 (c1) INCLUDE (c2, c3)
C.CREATE UNIQUE INDEX xtab1 ON tab1 (c3, c2, c1)
D.CREATE UNIQUE INDEX xtab1 ON tab1 (c2) INCLUDE (c1, c3)
