OracleDBA存储管理试题选

q. 1 : oracle immediately re-uses the space assigned to row-directory portion of the data block once you delete the corresponding rows.
　　1. true false 　
　　2
　　q. 2 : which of the following three portions of a data block are collectively called as overhead.
　　1. table directory, row directory and row data data block header, table diretory and free space table directory, row directory and data blcok header data block header, row data and row header 　
　　3 　
　　q. 3 : which portion of the data block contains table or index data
　　1. table directory row directory overhead row data
　　4 　　
　　q. 4 : what are the two space management parameters for controling the use of free space in a data block
　　1. initial and next pctfree and pctused tablespace and storage free space cannot be controlled at block level 　
　　2
　　q. 5 : the maximum number of transactions that a block can support is
　　1. 100 255 1000 unlimited
　　2
　　q. 6 : what is pctfree
　　1. a space management parameter which sets aside that much percentage of memory in the data block for future update of existing rows. a space management parameter which determines the minimum percentage of a block that can be used for row data plus overhead. a space management parameter which tells oracle that the block is available for inserts after the percentage of used memory falls below certain percentage. all of them
　　1 　　
　　q. 7 : what is the default value of next parameter
　　1. 1 block 2 blocks 5 blocks 100 blocks 　
　　3 　
　　q. 8 : which parameter reserves the more space for future updates
　　1. high pctincrease high pctfree high initial high pctused
　　2 　
　　q. 9 : pctfree and pctused together should not exceed
　　1. 100 50 25 10
　　1 　
　　q. 10 : row migration is a result of