在生产过程中调节器比例调节作用有以下规律比例度降低调节作用（） 增强。 减弱。 不变。
View the Exhibit and examine the attributes of an undo tablespace. In an OLTP system, the user SCOTT has started a query on a large table in the peak transactional hourthat performs bulk inserts. The query runs for more than 15 minutes and then SCOTT receives thefollowing error: ORA-01555: snapshot too old What could be the reason for this error（） The query is unable to get a read-consistent image.。 There is not enough space in Flash Recovery Area.。 There is not enough free space in the flashback archive.。 The query is unable to place data blocks in undo tablespace。
女性，42岁，体重60kg，烧伤后3h送至医院。右上肢水肿明显，剧烈疼痛，有较大水疱；双下肢（不包括臀部）无水疱，皮肤焦黄色，触之不痛，如皮革样。烧伤后第一个24h的补液总量大约是（） 4500ml。 5250ml。 6500ml。 7250ml。 7500ml。
You work as a database administrator for Certkiller .com. Users complain that their query is taking a long time to complete. You suspect the database buffer cache size to be the reason， and you define an alert to be generated when the buffer cache hit metric goes below 85%. When you observe the dynamic performance views， you find that the buffer cache hit ratio is 81% but no alerts are being generated. What could be the reason for this problem？（） The advisory memory has been turned off.。 The DB_CACHE_ADVICE parameter has been set to OFF in the parameter file.。 The STATISTICS_LEVEL parameter has been set to BASIC in the parameter file.。 The TIMED_STATISTICS parameter has been set to FALSE in the parameter file.。 The STATISTICS_LEVEL parameter has been set to TYPICAL in the parameter file.。
角色扮演
You work as a database administrator at Certkiller .com. In your production database， you observe that users’ transactions are consuming a lot of resource and you plan to impose resource restrictions by using Resource Manager. For which three resources can you enable usage restrictions by using Resource Manager？ （）
