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Database performance has degraded recently. index range scan operations on index ix_sales_time_id are slower due to an increase in buffer gets on sales table blocks. Examine these attributes displayed by querying DBA_TABLES: Now, examine these attributes displayed by querying DBA_INDEXES: Which action will reduce the excessive buffer gets?
Correct Answer: B
Given that index range scan operations onIX_SALES_TIME_IDare slower due to an increase in buffer gets, the aim is to improve the efficiency of the index access. In this scenario: * B (Correct):Re-creating the index usingADVANCED COMPRESSIONcan reduce the size of the index, which can lead to fewer physical reads (reduced I/O) and buffer gets when the index is accessed, as more of the index can fit into memory. The other options would not be appropriate because: * A (Incorrect):Re-creating theSALEStable sorted in order of the index might not address the issue of excessive buffer gets. Sorting the table would not improve the efficiency of the index itself. * C (Incorrect):Using the columns inIX_SALES_TIME_IDas a hash partitioning key for theSALES table is more relevant to data distribution and does not necessarily improve index scan performance. * D (Incorrect):Hash partitioning the index is generally used to improve the scan performance in a parallel query environment, but it may not reduce the number of buffer gets in a single-threaded query environment. References: * Oracle Database SQL Tuning Guide:Managing Indexes * Oracle Database SQL Tuning Guide:Index Compression
