采用抵押方式担保时，债务人不按照合同约定的期限履行债务时，债权人有权依法留置该财产。
You have lost datafile 4 from your database. Which is typically the fastest way to restore your database? （） ["Restore and recover the datafile. ","Restore and recover the tablespace. ","Restore and recover the database. ","Restore and recover the control file. ","Restore and recover the parameter file."]
公园
What are three methods to reduce Mysql server exposure to remote connections?（） ["Setting — skip-networking when remote connections are not required","Using the sql_mode=STRICT_SECURE after connections are established for encrypted communications","Setting specific GRANT privilege to limit remote authentication","Setting – mysql_secure_configuration to enable paranoid mode","Using SSL when transporting data over remote network"]
You have joined a new organization as a Database Administrator. The Security Administrator in your organization has kept human errors， such as erroneously dropping users， tables， and important data， to a minimum by carefully granting only the necessary privileges to each user. As a result of several ongoing transactions within your database， you discover that the flashback logs are rapidly increasing in the flash recovery area. To avoid out-of-space errors， you decide to delete the flashback logs from the flash recovery area. How can you delete the flashback logs from the database if your database is up and running？（） [" Shut down the database using the SHUTDOWN command. Mount the database using the STARTUP MOUNT EXCLUSIVE command and disable Flashback Database using the ALTER DATABASE FLASHBACK OFF statement."," Change the parameter setting in the SPFILE for the DB_RECOVERY_FILE_DEST parameter using the ALTER SYSTEM SET DB_RECOVERY_FILE_DEST=’’ SCOPE=BOTH statement while the database is up and running."," Shut down the database using the SHUTDOWN command. Mount the database using the STARTUP MOUNT EXCLUSIVE command. Change the parameter setting in the SPFILE for the DB_RECOVERY_FILE_DEST parameter using the ALTER SYSTEM SET DB_RECOVERY_FILE_DEST=’’ SCOPE=BOTH statement. Disable Flashback Database using the ALTER DATABASE FLASHBACK OFF statement."," Change the parameter setting in the SPFILE for the DB_RECOVERY_FILE_DEST parameter using the ALTER SYSTEM SET DB_RECOVERY_FILE_DEST=’’ SCOPE=BOTH statement. Shut down the database using the SHUTDOWN command. Mount the database using the STARTUP MOUNT EXCLUSIVE command and disable Flashback Database using the ALTER DATABASE FLASHBACK OFF statement."]
简述园长的角色。
