<{p}>77、<{/p}><{p}> <{/p}><{p}>Which three actions are performed by Database Upgrade Assistant (DBUA)? (Choose three.)<{/p}>

【多选题】
A <{p}>It recompiles all stored PL/SQL code by using utlrp.sql.<{br/}><{/p}>
B <{p}>It empties the RECYCLE BIN.<{br/}><{/p}>
C <{p}>It performs prerequisite checks to verify if the Oracle database is ready for upgrade<{br/}><{/p}>
D <{p}>It sets all user tablespaces to “read-only” before starting the upgrade<{br/}><{/p}>
E <{p}>It removes the AUDSYS schema and the AUDIT_ADMIN and AUDIT_VIEWER roles<{/p}>
F <{p}>It increases tablespace size, if required, to meet upgrade requirements.<{/p}>

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