Which two statements are true about Oracle Real Applications Insight ？（） it provides enhanced visibility across the entire application infrastructure 。 it provides a set of management tools that enable automation of configuraion。 it significantly increases the performance of Web-based applications with no code change。 it dramatically reduces costs associated with diagnostics， configuration， and deployment on production servers&e。
春秋战国时期，对促进民族融合起直接作用的因素是（）。 兼并战争。 铁器的使用。 各国变法。 商业兴盛。
You enable block change tracking. You issue the following command： BACKUP INCREMENTAL LEVEL 0 DATABASE； The next day，you issue the following command： BACKUP INCREMENTAL LEVEL 1 CUMULATIVE DATABASE； Which statement about the use of the change tracking file is true？（） RMAN reads the block change tracking file only when it performs the incremental level 0 backup.。 RMAN reads the block change tracking file when it performs both incremental backups.。 RMAN reads the block change tracking file only when it performs the incremental level 1 backup.。 RMAN does not read the block change tracking file when it performs either incremental backup.。
Your database is functioning in NOARCHIVELOG mode. Your database contains 15 tablespaces. You want to use Recovery Manager （RMAN） to perform backups. Which two backups would you be able to perform when the database is being accessed by users？（） Backup of offline tablespaces.。 Backup of read-only tablespaces.。 Backup of system-critical tablespaces.。 Backup of online， locally managed tablespaces.。 Backup of read/write dictionary-managed tablespaces.。
往复式压缩机在每次大修中，必须对主轴进行拆卸。
Which three values are valid parameters for the DO_KEY built-in?（）
