时钟组件（Timer）能有规律的以一定时间间隔触发（）事件。
简述固态扩散的条件
Which three statements are true about Flashback Database?（） Flashback logs are written sequentially, and are archived.。 Flashback Database uses a restored control file to recover a database.。 The Oracle database automatically creates, deletes, and resides flashback logs in the Fast RecoveryArea.。 Flashback Database can recover a database to the state that it was in before a reset logs operation.。 Flashback Database can recover a data file that was dropped during the span of time of the flashback.。 Flashback logs are used to restore to the blocks' before images, and then the redo data may be used to roll forward to the desired flashback time.。
如何防止泵的振动？
In the parameter file of your production database， the FAST_START_MTTR_TARGET parameter is set to 300 to optimize instance recovery. While observing the performance of the database during instance recovery， you find that the redo log files are not sized properly to support this activity. Which two sources could you use to determine the optimal size of the redo log files？（） the V$LOG view。 the V$DBFILE view。 the V$LOGFILE view。 the V$INSTANCE_RECOVERY view。 Oracle Enterprise Manager Database Control。
黄某，男性，32岁，头部被铁棍击伤，头皮裂开已12h以上，伤口无明显感染，其处理为（）
