Your company uses a mission-critical database named DB1, which is located on a server named SQL1. You want to mirror DB1 on a second server named SQL2. Before you can establish database mirroring, you need to prepare DB1 and the servers for mirroring. Which three actions should you perform?（） 正确。 错误。
目前SEG变频器不具备的功能是（） 正确。 错误。
View the Exhibit and examine the attributes of an undo tablespace. In an OLTP system, the user SCOTT hasstarted a query on a large table in the peak transactional hour that performs bulk inserts. The query runs formore than 15 minutes and then SCOTT receives the following error:ORA-01555: snapshot too old What could be the reason for this error（） 正确。 错误。
You are using Recovery Manager (RMAN) for backup and recovery operations with a recovery catalog. You have been taken database backups every evening. On November 15, 2007, at 11:30 AM, you were informed that the USER_DATA tablespace was accidentally dropped. On investigation, you found that the tablespace existed until 11:00 AM, and important transactions were done after that. So you decided to perform incomplete recovery until 11:00 AM. All the archive logs needed to perform recovery are intact. In NOMOUNT state you restored the control file that has information about the USER_DATA tablespace from the latest backup. Then you mounted the database. Identify the next set of commands that are required to accomplish the task? （） 正确。 错误。
液化石油气有两个来源其一是从比它轻的气体和比它重的原油中分离出来的，另一种来源是（）。 正确。 错误。
造价工程师职业道德规范对造价行业相关工作和造价工程师的约束作用，主要依靠社会舆论和道德的力量来维护，造价工程师的社会责任就显得尤为重要，这体现的是造价工程师职业道德规范的服务性
