对高温、高压锅炉，烘炉期间的上水应采取（）。 一般工业水。 除盐水。 软化水。
Which two statements are true regarding the starting of the database instance using the following command？（） SQL>STARTUP UPGRADE It enables all system triggers.。 It allows only SYSDBA connections.。 It ensures that all job queues remain active during the upgrade process.。 It sets system initialization parameters to specific values that are required to enable database upgrade scripts to be run.。
我国法定计量单位中共有（）个基本单位。 4。 5。 6。 7。
Which two statements are true about encrypting RMAN backup?（） (Choose two.) The transparent encryption of backups uses the encryption wallet。 The database uses the same encryption key for every encrypted backup。 The password encryption of backups only uses the password while creating and restoring backup。 If transparent encryption is configured, you cannot use the SET ENCRYPTION BY PASSWORD command to make password-protected backups.。
简述园长的角色。
You have lost datafile 4 from your database. Which is typically the fastest way to restore your database? （）
