IBM IBM Certifications P2090-047 Questions & Answers

• Question 1:

  What are two considerations for usage of materialized views? (Choose two)

  A. Materialized views are not supported.

  B. Materialized views are logical entities.

  C. Materialized views may improve query performance.

  D. Materialized views are the same as database views.

  E. Materialized views are considered for usage by the Optimizer.

  Correct Answer: CE

• Question 2:

  After performing a groom on a clustered base table, which statement is true?

  A. The table is redistributed on the ORGANIZE ON clause.

  B. The table is reorganized on the ORGANIZE ON clause.

  C. The table is reorganized on the DISTRIBUTE ON clause.

  D. The table is redistributed on the DISTRIBUTE ON clause.

  Correct Answer: B

• Question 3:

  When a poor choice of distribution key is made, what is the impact to storage allocation?

  A. Data is likely to negatively affect views.

  B. Data is likely to negatively affect compression.

  C. Data is likely to generate duplicate sequence values.

  D. Data is likely to be unevenly spread across the system.

  Correct Answer: D

• Question 4:

  Which statement is true about optimizer settings?

  A. They can be set system wide only.

  B. They can be set at the database level only.

  C. They can be set at the session and at the group level.

  D. They can be set system wide and at the session level.

  Correct Answer: D

• Question 5:

  Which statement about the GROOM TABLE feature is true?

  A. GROOM TABLE requires space to make a complete copy of the table.

  B. GROOM TABLE only operates on tables that include an ORGANIZE ON clause.

  C. GROOM TABLE prevents nzload from adding data while groom is in progress.

  D. GROOM TABLE allows UPDATE, DELETE, and INSERT operations to occur while groom is in progress.

  Correct Answer: D

• Question 6:

  Which statement is true?

  A. All user space is available for database expansion.

  B. Each database is assigned it's own section of disk space.

  C. When creating the database you can specify which disks to use.

  D. When you create a database you can set the maximum space it is allowed to use.

  Correct Answer: A

• Question 7:

  What should be considered when you are asked to select the distribution key columns for a very large fact table?

  A. As many columns as possible.

  B. Columns that contain many nulls.

  C. Columns that contain few unique values.

  D. Columns used to join to other large tables.

  Correct Answer: D

• Question 8:

  A table, TableA has one column, ColumnA. The following query can be used to determine the skew of Table A.

  A. Select distinct (ColumnA) from TableA;

  B. Select distinct(datasliceid) from TableA;

  C. Select datasliceid, count(*) from TableA group by 1 order by 2;

  D. Select ColumnA, count(*) from TableA group by ColumnA order by 2;

  Correct Answer: C

• Question 9:

  Which two statistical data points are automatically updated when performing an INSERT on a table? (Choose two.)

  A. The number of rows in the table.

  B. The column histogram statistics.

  C. The number of NULLs in each column.

  D. The number of unique values in each column.

  E. The minimum and maximum column value information (excluding text columns).

  Correct Answer: AE

• Question 10:

  How does the PureData System for Analytics utilize the distribution key to store records on disk?

  A. System assigns records to a FPGA based on their distribution key value.

  B. System assigns records to the host based on their distribution key value.

  C. System assigns records to a logical data slice based on their distribution key value.

  D. System assigns records to a Netezza Database Accelerator based on their distribution key value.

  Correct Answer: C