User A issues the command: LOCK TABLES pets READ; Which command can User B execute against the pets table?（）

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  A . Add root user to the /etc/hosts.equiv on serverB . B . Create $HOME/.rhosts file for the root user on serverB . C . Restart the rshd daemon with root enabled option on serverB . D . Add entry to allow root user from serverA to the /etc/hosts.allow on serverB .

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• The user SCOTT who is the owner of ORDERS and ORDERJTEMS tables issues the following  GRANT command：  GRANT ALL   ON orders， order_items   TO PUBLIC；   What correction needs to be done to the above statement？ （）

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• The DBA issues this SQL command: https://assets.asklib.com/images/image2/2018080117142684706.jpg What privileges does the user Scott have at this point?（）

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• You executed the following command to drop a user：   DROP USER scott CASCADE；   Which two statements regarding the above command are correct？（）

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• The DBA issues this SQL command: CREATE USER scott IDENTIFIES by tiger; What privileges does the user Scott have at this point? （）

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• You executed the following command to drop a user: DROP USER scott CASCADE; Which two statements regarding the above command are correct?（）

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• non-root user can run rsh commands from serverA to serverB， but attempts to run rsh commands by the root user return with a permission error message. What action will resolve the problem？ （）

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  A .  After two days，a backup will be marked obsolete B .  After two days，a backup will be deleted from the media C .  If the RMAN repository has records of two or more recent backups of a file，then older backups will be deleted from the media. D .  If the RMAN repository has records of two or more recent backups of a file then older backups will be marked obsolete.

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• You issue the following RMAN command to set a retention policy on a database: RMAN>CONFIGURE RETENTION POLICY TO REDUNDANCY 2; What will be the outcome of issuing this command? （）

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• While troubleshooting a connectivity problem on the network, you issue the ping command from your PC command prompt, but the output shows "request times out."

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