Upon starting your database， you receive the following error： SQL> startup ORACLE instance started. Total System Global Area 171581440 bytes Fixed Size 1298640 bytes Variable Size 146804528 bytes Database Buffers 20971520 bytes Redo Buffers 2506752 bytes Database mounted. ORA-00313： open failed for members of log group 1 of thread 1 ORA-00312： online log 1 thread 1： ’/oracle01/oradata/orcl/redo01.log’ ORA-00312： online log 1 thread 1： ’/oracle01/oradata/orcl/redo01a.log’ You can choose from the following steps： a. Restore the database datafiles. b. Issue the alter database clear unarchived logfile group 1 command. c. Issue the alter database open command. d. Issue the alter database open resetlogs command. e. Recover the database using point-in-time recovery. f. Issue the Startup Mount command to mount the database. g. Back up the database. Which is the correct order of these steps in this case？（） a， f， e， d， g。 f， e， d。 f， b， c， g。 a， f， c。 The database cannot be recovered.。
A customer plans to add high performance shared storage with three servers and using direct attach. Cost is a minor issue compared to performance. Which of the devices meets this requirement？（） DS3200。 EXP3000。 DS3300。 DS3400。
液化石油气能使石油产品溶化，其阀门填料应采用（）。 氯化氢。 聚氯乙烯。 聚四氟乙烯。 石棉。
城市人口规模的制约因素有哪些？
You set the following parameters in the parameter file and restarted the database: Which two statements are true regarding these parameters after the database instance is restarted?（） The MEMORY_MAX_TARGET parameter is automatically set to 500 MB。 The value of the MEMORY_MAX_TARGET parameter remains zero till it is changed manually。 The PGA_AGGREGATE_TARGET and SGA_TARGET parameters are automatically set to zero。 The lower bounds of PGA_AGGREGATE_TARGET and SGA_TARGET parameters are set to 90 MB and 270 MB, respectively。
按照国家有关部门规定，建设项目设计概算应在（）阶段编制。
