一支220KV套管运行一年后，其介损tgσ值由0.37%上升至3.2%，可能的原因（）。 电容屏产生悬浮电位。 油纸中有气泡。 严重受潮。
Which of the following phases is a high-level design proposed Cisco Unified Communications solution developed （） Operate。 Design。 Plan。 Prepare。
某甲在公共汽车上窃取某乙人民币3000元，下车时被某乙发现，钱被追回。在将其扭送派出所途中，甲猛地将乙推开，窜入一死胡同，被群众抓获。某甲的行为应认定为（） 构成抢劫罪。 构成盗窃罪。 应以抢劫罪论处。 尚未构成犯罪。
What are three purposes of the RMAN “FROM” clause?（） to support PUSH-based active database duplication。 to support synchronization of a standby database with the primary database in a Data environment。 To support PULL-based active database duplication。 To support file restores over the network in a Data Guard environment。 To support file recovery over the network in a Data Guard environment。
You work as a database administrator at Certkiller .com. Your database is open and running in ARCHIVELOGmode. You take RMANfull backups every Sunday night. On Monday morning， while querying the user1.employeestable， you receive the following error message： 01578： ORACLE data block corrupted （file # 5， block # 51） ORA-01110： data file 5：’/u01/app/oracle/oradata/orcl/example01.dbf’ You need to rectify the corruption while ensuring the following： The data file should remain online. The mean time to recover （MTTR） should be minimal. You are not using a backup control file and all the archived logs are accessible. Which option would you choose？（） flash back the corrupted blocks。 use the DBMS_REPAIR package。 use the RMAN TSPITR command。 use the RMAN BLOCKRECOVER command。 use the RESTORE DATABASE and RECOVER DATABASE commands。 investigate the time at which the corruption occurred and perform a point-in-time recovery。
You are working on a test database where instance recovery takes a considerable amount of time.How can reduce the recovery time？（）
