信度是效度的（）。 必要而非充分条件。 充分非必要条件。 充分必要条件。 非充分非必要条件。
Which statement about using RMAN stored scripts is true?（） To create and execute an RMAN stored script, you must use a recovery catalog.。 When executing a stored script and a command fails, the remainder of the script is executed, and a message is written to the alert log file.。 RMAN stored scripts can always be executed against any target database that is registered in the recovery catalog.。 When you execute a stored script, it always executes using the persistent channel settings previously set with the CONFIGURE command.。
Examine the following scenario： -Database is running in ARCHIVELOG mode. -Complete consistent backup is taken every Sunday. -On Tuesday the instance terminates abnormally because the disk on which control files are located gets corruptedThe disk having active online redo log files is also corrupted. The hardware is repaired and the paths for online redo log files and control files are still valid. Which option would you use to perform the recovery of database till the point of failure？（） Restore the latest whole backup，perform complete recovery，and open the database normally 。 Restore the latest whole backup，perform incomplete recovery，and open the database with the RESETLOGS option.。 Restore the latest backups control file，perform complete recovery，and open the database with the RESETLOGS option.。 Restore the latest backup control file，perform incomplete recovery using backup control file，and open the database with the RESETLOG option.。
充装秤台面上需放置（），严禁钢瓶与秤台面直接接触。 钢板；。 铜板；。 防静电橡胶板；。 铁板。
120阀属于二压力机构系统。
From the information below, what command would the administrator run to allocate the file backed optical device, named useful_scripts, to virtual SCSI adapter vhost0?（）
