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Examine this command: SQL > exec DBMS_STATS.SET_TABLE_PREFS (`SH', `CUSTOMERS', `PUBLISH', `false'); Which three statements are true about the effect of this command?
Correct Answer: C,D,E
*SET_TABLE_PREFS Procedure This procedure is used to set the statistics preferences of the specified table in the specified schema. *Example: Using Pending Statistics Assume many modifications have been made to the employees table since the last time statistics were gathered. To ensure that the cost-based optimizer is still picking the best plan, statistics should be gathered once again; however, the user is concerned that new statistics will cause the optimizer to choose bad plans when the current ones are acceptable. The user can do the following: EXEC DBMS_STATS.SET_TABLE_PREFS('hr', 'employees', 'PUBLISH', 'false'); By setting the employees tables publish preference to FALSE, any statistics gather from now on will not be automatically published. The newly gathered statistics will be marked as pending.