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IBM PureData System for Transactions Technical Mastery Test v1 Sample Questions:

1. Which statement is true regarding the compress engine?

A) Compression is performed by the host.
B) Compression degrades data scan speeds.
C) Compression ratio is data dependent.
D) Compression is performed by the SAS switches.

2. When is the ToplogyImbalance event triggered?

A) When a SAS switch has failed.
B) When an S-Blade has ownership of more dataslices than is optimal (usually following a disk replacement).
C) When the path the path between an S-Blade and its disks has failed.
D) When a disk enclosure's voltage sensor is reading outside the nominal range.

3. Within a single PureData System for Analytics, what is the fastest way to copy a 10TB TableA from DatabaseA to another DatabaseB?

A) Use external tables and UNIX pipes.
B) Use the COPY command.
C) Use nzbackup and nzrestore commands.
D) Use a CTAS (Create Table as Select) SQL statement.

4. When creating a table, you can specify a column constraint for each individual column of either "NULL" or "NOT NULL". When column values are later evaluated within a query statement, which of these is true?

A) 0 is equal to null, the empty string ( '' ) is not equal to null.
B) 0 is not equal to null, the empty string ( '' ) is not equal to null.
C) 0 is equal to null, the empty string ( '' ) is equal to null.
D) 0 is not equal to null, the empty string ( '' ) is equal to null.

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

A) Data is likely to negatively affect compression.
B) Data is likely to be unevenly spread across the system.
C) Data is likely to negatively affect views.
D) Data is likely to generate duplicate sequence values.

Solutions: