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db file sequential read等待P3参数的含义是？（）
- A、访问的数据块号
- B、访问的文件号
- C、访问的数据块数量
- D、访问的文件名
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单选题You have a read-only tablespace on read-only media. You want to perform a media recovery on the existing data files， but using a backup control file. The backup control file indicates that the status of the read-only tablespace was read/write when the control file was backed up. What should you consider？（）A
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多选题You notice a high number of waits for the db file scattered read and db file sequential read events in the recent Automatic Database Diagnostic Monitor (ADDM) report. After further investigation, you find that queries are performing too many full table scans and indexes are not being used even though the filter columns are indexed. Identify three possible reasons for this.（）AMissing or stale histogram statisticsBUndersized shared poolCHigh clustering factor for the indexesDHigh value for the DB_FILE_MULTIBLOCK_READ_COUNT parameterEOversized buffer cache
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单选题要从文件"file.dat"中读出第10个字节到变量c中，下列哪个方法适合？（）A
FileInputStream in=new FileInputStream（file.dat）；in.skip（9）；intc=in.read（）B
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FileInputStream in=new FileInputStream（file.dat）；intc=in.read（）D
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drop and recreate the readonly tablespacesB
rename the readonly data files to their correct file namesC
change the tablespace status from read/write to readonlyD
recreate the readonly tablespace because it is automatically removed
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多选题Oracle数据中，下列哪些等待事件将产生大量的IO？（）Alog file parallel writeBlatch：cache buffers chainsCdb file sequential readDdb file scattered read
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单选题在oracle数据库中，db file sequential read等待P2参数的含义是？（）A
访问的文件名B
访问的文件号C
文件拥有者D
访问的数据块号
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