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TeraData HCIA-Datacom V1.0 Sample Questions (Q47-Q52):
NEW QUESTION # 47
An application is consuming very high I/O on Teradata Vantage. The Administrator has been asked to identify the queries that are consuming more than 100 million IOs and are suspected of completing Full Table Scans or Large Redistribution.
Which metrics should be examined for high values to identify the queries?
Answer: D
Explanation:
TOTALIOCOUNT represents the total number of I/O operations a query performs, which is crucial when trying to identify queries consuming excessive I/O (in this case, more than 100 million IOs). This directly indicates the amount of I/O a query is generating.
PJI (Product Join Index) measures whether a product join is being performed in the query, which is often associated with inefficient joins that result in large redistributions of data. A high PJI value indicates that the query might be performing a product join, leading to a significant performance hit due to large redistributions.
Option A (MAXAMPIO and PJI): MAXAMPIO refers to the maximum I/O performed by a single AMP, but TOTALIOCOUNT is a more direct indicator of the total I/O performed by a query across all AMPs.
Option C (I/O SKEW % and UII): I/O SKEW % indicates uneven distribution of I/O, which can cause performance issues, but it does not directly measure the total I/O consumption like TOTALIOCOUNT does. UII (Utility Impact Index) is relevant but not as important for identifying large I/O queries.
Option D (REQPHYSIO and UII): REQPHYSIO refers to the number of physical I/Os, but it is not as comprehensive as TOTALIOCOUNT, which includes both logical and physical I/O.
Thus, TOTALIOCOUNT (for total I/O) and PJI (to detect potential large redistributions due to product joins) are the key metrics to identify queries with high I/O and large redistributions.
NEW QUESTION # 48
An Administrator reports a power user running a query that is consuming significant CPU in a final step product join and impacting other users due to the high priority of the workload.
Upon contacting the user in the application team, they are advised that the query is a request from the CEO and needs to be completed. The team decides to remediate the situation by changing the workload to a lower priority.
Which Viewpoint portlet should be used to make this adjustment?
Answer: B
Explanation:
The Workload Designer portlet in Viewpoint is used to manage and adjust workloads, including setting priorities for different workloads. To address the situation where a high-priority query is consuming too many resources, the Workload Designer can be used to adjust the priority of the workload that the query belongs to, ensuring that the impact on other users is reduced while still allowing the query to complete.
The other options are less suited for adjusting workload priorities:
Application Queries is used to monitor and manage queries related to specific applications but does not provide direct options to change workload priorities.
Query Monitor allows the monitoring of active queries and possibly aborting problematic queries but does not handle workload priority changes.
Workload Health is used for monitoring the health and performance of workloads, but it is not the tool used to modify priorities.
NEW QUESTION # 49
A capacity planner wants to keep a record of the number of rows that are added and deleted from certain tables over time and would like to obtain this information without having to change the application itself.
Which DBQL option should be enabled?
Answer: B
Explanation:
The OBJECTS option in DBQL (Database Query Logging) records the tables and other objects that are accessed by queries, including information on how many rows are added, updated, or deleted. This allows the capacity planner to track changes to specific tables without modifying the application itself.
The other options are less relevant to tracking row changes:
USECOUNT records how often specific queries are executed, but not the number of rows affected.
EXPLAIN captures the query execution plan, which doesn't provide details on rows added or deleted.
VERBOSE XMLPLAN gives detailed execution plans in XML format, but it is more focused on query execution and optimization, not tracking row modifications.
NEW QUESTION # 50
An Administrator needs to perform a cleanup task on the LOAD_ISOLATED table Employee_Address, which has grown in size.
Which lock is placed on the table when the Administrator performs clean up of the logically deleted rows?
Answer: B
Explanation:
When performing cleanup tasks such as deleting logically deleted rows, the WRITE lock is typically applied. This lock ensures that the Administrator can modify the data in the table (such as removing logically deleted rows) while preventing other users from accessing the table for write operations. However, it allows other users to read from the table.
Other lock types:
ROW ACCESS allows reading specific rows without blocking other access, which is not suitable for cleanup tasks.
EXCLUSIVE locks the entire table for both reading and writing, which is generally too restrictive for this kind of operation.
READ only allows read access and does not permit any modifications, which would prevent the cleanup task from being performed.
NEW QUESTION # 51
An Administrator is configuring an alert service on a Vantage system and must define threshold levels and triggers for the alerts.
Match the Administrator's portlet to the correct use definition.
(Each answer is used once.)
Answer:
Explanation:
NEW QUESTION # 52
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