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Quiz Oracle - 1Z0-921 - High Pass-Rate MySQL 2021 Implementation Essentials Valid Exam Cram
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 for the table partitions
that return a few rows to the queries.
B. 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.
C. 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.
D. 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.
E. 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.
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.
Answer: A,B,C
Explanation:
Note:
* Oracle 12c now provides the ability to index a subset of partitions and to exclude the others.
Local and global indexes can now be created on a subset of the partitions of a table. Partial Global indexes provide
more flexibility in index creation for partitioned tables. For example, index segments can be omitted for the most
recent partitions to ensure maximum data ingest rates without impacting the overall data model and access for the
partitioned object.
Partial Global Indexes save space and improve performance during loads and queries. This feature supports global
indexes that include or index a certain subset of table partitions or subpartitions, and exclude the others. This
operation is supported using a default table indexing property. When a table is created or altered, a default indexing
property can be specified for the table or its partitions.
What are two ways to optimize report performance when dealing with variables? (Choose two.)
A. Ensure you are implementing chain linking.
B. Maximize the number of variables used rather than use Excel cell referencing where possible.
C. Combine multiple validation checks within one ##R validation rule.
D. Use block variables rather than individual cell variables when pulling multiple items from one table.
Answer: C,D
During which phase of the incident management life cycle should metrics such as "mean time to incident discovery" and "cost of recovery" be reported?
A. Post-incident assessment
B. Containment, analysis, tracking, and recovery
C. Planning and preparation
D. Detection, triage, and investigation
Answer: A
Evaluate the following SQL statement:
Which statement is true regarding the outcome of the above query?
A. It produces an error because the ORDER BY clause should appear only at the end of a compound query-that is, with the last SELECT statement.
B. It produces an error because positional notation cannot be used in the ORDER BY clause with SET operators.
C. It executes successfully but ignores the ORDER BY clause because it is not located at the end of the compound statement.
D. It executes successfully and displays rows in the descending order of PROMO_CATEGORY.
Answer: A
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