You have not configured Oracle Managed Files (OMF) in your database. You do not want to scan the entire datafile every time an incremental backup is performed. You decide to enable the block change tracking feature.Which statement should you use to enable the block change tracking feature?（） ALTER DATABASE ENABLE BLOCK CHANGE TRACKING。 ALTER SYSTEM ENABLE BLOCK CHANGE TRACKING USING FILE
。 ALTER DATABASE ENABLE BLOCK CHANGE TRACKING USING FILE 。 ALTER SYSTEM ENABLE BLOCK CHANGE TRACKING。
试举例说明创业者应具备哪些素质要求？
男性，65岁。风湿性心脏病左房室瓣（二尖瓣）狭窄15年，体外循环瓣膜置换术后6h，呼吸机辅助呼吸，吸入Fi0275%，患者烦躁，Pa0275kPa，心率100/min，血压105/75mmHg。此时考虑病情应是（） 休克。 ARDS。 循环衰竭。 肺栓塞。 MODS。
Which two statements about sequences are true? （） You use a NEXTVAL pseudo column to look at the next possible value that would be generated from a sequence, without actually retrieving the value.。 You use a CURRVAL pseudo column to look at the current value just generated from a sequence, without affecting the further values to be generated from the sequence.。 You use a NEXTVAL pseudo column to obtain the next possible value from a sequence by actually retrieving the value from the sequence.。 You use a CURRVAL pseudo column to generate a value from a sequence that would be used for a specified database column.。 If a sequence starting from a value 100 and incremented by 1 is used by more then one application, then all of these applications could have a value of 105 assigned to their column whose value is being generated by the sequence.。 You use REUSE clause when creating a sequence to restart the sequence once it generates the maximum value defined for the sequence.。
专家教师相对于职初教师、经验教师，在知识结构上策略知识占有较大优势。
Which of the following describes the advantage of using Fibre Channel over Ethernet （FCoE） in POWER6 and POWER7 Blades？（）
