多选题Which three tasks can be performed by using the performance Schema?（）AFinding queries that are not using indexesBFinding rows that are locked by InnoDBCFinding client connection attributesDFinding the part of a code in which a single query is spending

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A warehouse fact table in your Oracle 12c Database is range-partitioned by month and accessed frequently with queries that span multiple partitions The table has a local prefixed, range partitioned index. Some of these queries access very few rows in some partitions and all the rows in other partitions, but these queries still perform a full scan for all accessed partitions. This commonly occurs when the range of dates begins at the end of a month or ends close to the start of a month. You want an execution plan to be generated that uses indexed access when only a few rows are accessed from a segment, while still allowing full scans for segments where many rows are returned. Which three methods could transparently help to achieve this result?（）

• A、Using a partial local Index on the warehouse fact table month column with indexing disabled to the table partitions that return most of their rows to the queries.
• B、Using a partial local Index on the warehouse fact table month column with indexing disabled for the table partitions that return a few rows to the queries.
• C、Using a partitioned view that does a UNION ALL query on the partitions of the warehouse fact table, which retains the existing local partitioned column.
• D、Converting the partitioned table to a partitioned view that does a UNION ALL query on the monthly tables, which retains the existing local partitioned column
• E、Using a partial global index on the warehouse fact table month column with indexing disabling for the table partitions that return most of their rows to the queries.
• F、Using a partial global index on the warehouse fact table month column with indexing disabled for the table partitions that return a few rows to the queries.

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Which three functions are performed by the SQL Tuning Advisor?（） (Choose three.)

• A、Building the SQL profile
• B、Recommending optimization of materialized views
• C、Checking query objects for missing and stale statistics
• D、Recommending bitmap, function-based, and B-tree indexes
• E、Recommending restructuring SQL queries that are using bad plans

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Which three functions are performed by the SQL Tuning Advisor?（）

• A、Building and implementing SQL profiles
• B、Recommending the optimization of materialized views
• C、Checking query objects for missing and stale statistics
• D、Recommending bitmap, function-based, and B-tree indexes
• E、Recommending the restructuring of SQL queries that are using bad plans

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Consider the events_% tables in performance Schema. Which two methods will clear or reset the collected events in the tables?（）

• A、Using DELETE statements, for example, DELETE FROM performance_schema.events_watis_current
• B、Using the statement RESET PERFORMANCE CACHE
• C、Using the statement FLUSH PERFORMANCE CACHE
• D、Using TRUNCATE statements, for example, TRUNATE TABLE performance_schema.events_waits_current
• E、Disabling and re-enabling all instruments
• F、Restarting Mysql