下面（）可以有效减少行迁移现象的发生？ A: 指定较大的PCTFREE B: 指定较大的PCTUSED C: 指定较小的PCTFREE D: 指定较小的PCTUSED

某用户需要创建一个很小的表,但是该表会被许多查询使用,这时用户应当在创建该表时指定下列哪个子句? A: pctfree和pctused B: cache C: nologging D: tablespace

Identify two situations in which the block header grows in a data block. （） A: when row directories need more row entries B: when there is row migration in the data block C: when there is an increase in the PCTFREE value for the data block D: when more transaction slots are required than are initially configured

Identify two situations in which the block header grows in a data block. （） A: Awhen row directories need more row entries B: Bwhen there is row migration in the data block C: Cwhen there is an increase in the PCTFREE value for the data block D: Dwhen more transaction slots are required than are initially configured