HP Vertica Solutions [2012] v6.0

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Which methods are available to optimize a projection for delete processing? (Select two.)

  • A. Add a low cardinality column to the beginning of all projections on the source table.
  • B. Add a high cardinality column to the end of all projections on the source table.
  • C. Add all columns used as delete predicates to all projections on the source table.
  • D. Add a low cardinality column to the end of all projections on the source table.
  • E. Add a high cardinality column to the beginning of all projections on the source table.


Answer : AC

What are the advantages of a merge join versus a hash join? (Select two.)

  • A. Sometimes a merge join runs faster than a hash join.
  • B. A merge join uses memory more efficiently.
  • C. A merge join requires no optimization.
  • D. A merge join can spill to disk if the inner table is too large.
  • E. A merge join joins the data into a new projection.


Answer : BC

Reference:https://my.vertica.com/docs/6.1.x/HTML/index.htm#20001.htm

If your CEO runs a query each day, how can you be assured necessary resources will be available when the query is run? (Select two.)

  • A. Create a resource pool with dedicated resources for the CEO.
  • B. Move all other users out of the general pool, leaving the CEO as the only user in the general pool.
  • C. Reserve one core for use by the CEO user only.
  • D. Assign the CEO user to the general resource pool with a high MEMORYCAP.
  • E. Profile the query to determine estimated resource usage.


Answer : AE

What is a benefit of having identically-sorted buddy projections?

  • A. improved storage usage, since Vertica shares data files
  • B. more efficient use of disk since the data is only on one node
  • C. better query performance, since Vertica gets half the data from each projection
  • D. fast recovery of a down node


Answer : D

Which statements are true about a prejoin projection? (Select three.)

  • A. A prejoin projection enforces primary and foreign key constraints.
  • B. A prejoin projection does not increase the storage footprint.
  • C. A prejoin projection slows down data loading.
  • D. A prejoin projection can process any type of join.
  • E. A prejoin projection adds no limitations to the tables in the join.
  • F. A prejoin projection improves query run time performance.


Answer : A,B,E

What is a difference between maxconcurrency and plannedconcurrency?

  • A. Maxconcurrency is a hard limit to the number of queries running within a pool; plannedconcurrency is used to create a query budget.
  • B. Maxconcurrency is used to create a query budget; plannedconcurrency is a hard limit to the number of queries running within a pool.
  • C. Maxconcurrency is a hard limit to the number of queries running within a pool; plannedconcurrency limits the number of queries running on the cluster.
  • D. Maxconcurrency limits the number of queries running on the cluster; plannedconcurrency is a hard limit to the number of queries running within a pool.


Answer : C

What are the advantages of a group by pipe versus a group by hash? (Select two.)

  • A. A group by pipe uses memory more efficiently.
  • B. A group by pipe can be processed spill to disk if the join result is large.
  • C. A group by pipe is at least as fast as a group by hash.
  • D. A group by pipe requires no optimization.
  • E. A group by pipe builds its entire output table in memory.


Answer : AE

What is local segmentation capability in Vertica?

  • A. Vertica automatically splits current segments in half to redistribute them to new nodes.
  • B. Vertica automatically partitions the data, allowing partitions to be dropped and recreated on new nodes.
  • C. Vertica automatically creates more segments than are currently needed, allowing some segments to be moved to new nodes as needed.
  • D. Vertica automatically partitions the segmented data, allowing some partitions to be moved to new nodes as needed.


Answer : D

Reference:http://vertica-forums.com/viewtopic.php?f=5&t=874

What is the process for online recovery of a failed node? (Select two.)

  • A. The recovered node gathers the necessary files from nodes with its buddy projections.
  • B. The recovered node verifies that it is current once a recovery cycle completes.
  • C. The recovered node uses spread to speed up the recovery process.
  • D. The recovered node restores all files from the last backup.
  • E. The recovered node must be rebuilt from epoch 0.


Answer : BD

What is a Vertica cluster?

  • A. a collection of projection files
  • B. a grouping of several Vertica databases
  • C. the set of nodes running one instance of Vertica
  • D. a physical machine configured to run an instance of Vertica


Answer : B

How can you disallow user connections, while preserving dbadmin connectivity?

  • A. SELECT close_session (session_id);
  • B. SELECT close_all_sessions;
  • C. SELECT set_config_parameter ('MaxClientSessionsVS');
  • D. SELECT set_config_parameter ('MaxClientSessionsVO');


Answer : C

What does Event Series Join do?

  • A. enables analysis of two series of data when their measurement intervals do not align
  • B. evaluates the values of a given set of variables and groups those values into a window
  • C. enables identification of a sequence of defined events
  • D. increments a counter based on whether an expression evaluates as true


Answer : A

Reference:http://www.vertica.com/wp-content/uploads/2011/06/Whats-New-in-Vertica-
50.pdf(page 1, see event series join)

Which statement is true about a query explain plan?

  • A. It determines how to run the query, runs it, and returns the result.
  • B. It writes the SQL to execute a query.
  • C. It tells exactly how many rows will be returned by the query.
  • D. It displays the results of Optimizer to the user, showing projection(s) used and the query process.


Answer : B

What can be used to determine memory resources needed by a query?

  • A. Generate an EXPLAIN plan on the query.
  • B. Review the digraph of the query.
  • C. PROFILE the query.
  • D. Run the query and view the information in the results.


Answer : C

Which features are available when using the Management Console for monitoring Vertica?
(Select two.)

  • A. can only be accessed from a Windows machine
  • B. can only be accessed from a Linux machine
  • C. can be used by multiple users, with different sets of privileges for each
  • D. provides a unified view of all Vertica clusters
  • E. provides a visual depiction of CPU usage across the nodes of the cluster


Answer : D,E

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