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IBM PureData System for Analytics Technical Mastery Test v1 Sample Questions:
1. Using a date column as a distribution key may distribute rows evenly across dataslices, why is this a poor choice of a distribution key?
A) Queries on the table will invoke compression.
B) Queries on the table will invoke compression on the date columns.
C) Queries on date range will utilize only host processing.
D) Queries on date range may involve processing skew.
2. Why is table skew important to manage?
A) Low table skew negatively impacts performance.
B) Low table skew negatively impacts data compression.
C) Deleted rows consume disk space until they are freed.
D) High table skew negatively impacts performance.
3. After performing a groom on a clustered base table, which statement is true?
A) The table is reorganized on the ORGANIZE ON clause.
B) The table is redistributed on the DISTRIBUTE ON clause.
C) The table is redistributed on the ORGANIZE ON clause.
D) The table is reorganized on the DISTRIBUTE ON clause.
4. Why is generating statistics on a table important to query performance?
A) The table statistics are used to facilitate disk space reclamation of deleted rows.
B) The optimizer uses statistics to determine the optimal execution plan for queries.
C) The Zone Map information cross references the table statistics for each column to avoid scanning.
D) The Field Programmable Gate Array (FPGA) utilizes the statistics to identify which row/columns to filter.
5. You have access to two databases, DEV and PROD. Currently you are connected to the DEV database. Which operation is permitted?
A) Truncate table PROD..TableA
B) Select * from PROD..TableA
C) Insert into PRO.TableA select * from DEV..TableB
D) Delete from PROD..TableA
Solutions:
| Question # 1 Answer: D | Question # 2 Answer: D | Question # 3 Answer: A | Question # 4 Answer: B | Question # 5 Answer: B |
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