下列属于一种业务附属型、自我服务性质的配送模式的是（） 从事电子商务的企业自建配送中心，自己经营配送业务。 将配送业务委托给专业物流公司，实行配送业务外包。 与专业物流公司进行合作，采取单项业务外包的配送模式。 与其他企业合建配送中心，共同经营配送业务。
我国正式出现"税收"一词是在1916年贾士毅的（）一书中。 《原富》。 《实业计划》。 《民国财政史》。 《赋税论》。
You created a snapshot of the /data2 filesystem as follows： # fssnap -F ufs -o bs=/data2/snap /data2 But， the system responds with the following error： snapshot error： Invalid backing file path What is the problem？ （） The /data filesystem does not exist.。 This message indicates that the /data2/snap directory does not exist.。 The name of the Backing Store is incorrect， it should be /dev/fssnap/0。 This message indicates that you cannot have the backing store file on the same filesystem as the filesystem being snapped.。
对管道分段进行气压试验时，升压速度不宜过快，每小时不宜超过（） 1MPA。 3MPA。 5MPA。 10MPA。
Your database is in NOARCHIVELOG mode. The database has three online redo log groups， and each group contains three online redo log members. The online redo log members are stored across three hard disks， E， F， and G， respectively. Hard disk G crashed while the LGWR background process was writing redo information to the online redo log files. What effect will this crash have on the database？（） The database will operate normally without generating any redo.。 The database will hang， and you must shut down and restart the instance.。 The database will crash， and you must recover the database from the point of failure.。 The database will operate normally and will generate minimal redo for the tables created with the NOLOGGING clause.。
What RMAN command must you use before you can back up a database using the recovery catalog？（）
