<{p}>50、Which statement correctly describes the SQL profiling performed by the SQL Tuning Advisor?<{/p}>

【多选题】
A It is a set of recommendations by the optimizer to create new indexes
B It is a set of recommendations by the optimizer to change the access methods used
C It is auxiliary information collected by the optimizer for a SQL statement to help use better joins orders
D It is a set of recommendations by the optimizer to restructure a SQL statement to avoid suboptimal execution plans
E It is auxiliary information collected by the optimizer for a SQL statement to eliminate estimation error

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