You performed the RMAN database backup having a backupset key number 231 with the KEEP FOREVER option. After some days， you want to change the status of the database backup and you issued the following command： RMAN>CHANGE BACKUPSET 231 NOKEEP； What is the implication of this command？（） The backup is deleted.。 The backup is marked unavailable.。 The backup overrides the backup retention policy.。 the backup becomes eligible for deletion according to the existing retention policy.。
面向对象分析的核心在于（） 立正确的模型。 识别问题域对象。 识别对象之间的关系。 以上都是。
Which built-in do you use to determine which timer in form module has expired?（） FIND_TIMER 。 GET_TIMER_PROPERTY。 GET_APPLICATION_PROPERTY 。 GET_CUSTOM_ITEM_EVENT_PROPERTY。
（）的《百合花》取材于战争生活而不写战争场面，涉及重大题材而不写重大事件。
A redo log file is corrupted while the database is open； as a consequence， database operations are stopped because archiving cannot continue. What would you do to solve the problem？（） clear the redo log group。 perform redo log file import。 perform an incomplete recovery。 perform a redo log recovery using Recovery Manager （RMAN）。 shut down the database and open the database in the NOARCHIVELOG mode。
For Ethernet-to-Ethernet routers, such as the Cisco 831 behind a cable modem or DSL bridge, a traffic shaper is configured. This is required since the output 10-Mbps interface will not be congested. Which two statements are true?（）
