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TeraData TDVAN5 Exam Syllabus Topics:
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NEW QUESTION # 21
Which option in READ_NOS will reduce the number of objects scanned by queries?
- A. BUFFERSIZE
- B. ACCESS_KEY
- C. LOCATION
- D. FULLSCAN
Answer: C
Explanation:
The LOCATION option in READ_NOS is used to specify the exact path or directory in the external storage system, helping reduce the number of objects scanned by narrowing down the scope of the query to specific locations within the data source.
The other options:
BUFFERSIZE adjusts the size of the data buffer used in reading, but does not reduce the number of objects scanned.
ACCESS_KEY is used to authenticate access to the data but does not affect the number of objects scanned.
FULLSCAN would scan all objects and is the opposite of what is needed to reduce the number of objects scanned.
NEW QUESTION # 22
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 # 23
There is corruption in a table in the DBC database.
Which action should the Administrator take to restore the table?
- A. Perform a SYSINIT, and restore the entire system.
- B. Set the corrupted AMP offline, and restore the corrupted table.
- C. Perform a SYSINIT, and restore the corrupted table.
- D. Set the corrupted AMP offline, and restore the entire system.
Answer: B
Explanation:
If a table in the DBC (Data Dictionary) database is corrupted, the proper approach is to set the corrupted AMP offline to isolate the issue, and then restore the corrupted table from a backup. This limits the scope of the recovery to only the affected AMP and table, minimizing the impact on the rest of the system.
Perform a SYSINIT, and restore the corrupted table: A SYSINIT is a full system initialization and should only be done in extreme cases, as it wipes the entire system. This is too drastic for table-level corruption.
Set the corrupted AMP offline, and restore the entire system: Restoring the entire system is unnecessary if only one table is corrupted.
Perform a SYSINIT, and restore the entire system: This would be an extreme and time-consuming option, only used if the entire system is corrupted.
NEW QUESTION # 24
An Administrator manages a Vantage system that is continually updated. The system is critical to the business and must be available as much as possible. The Administrator decides to use a backup strategy that will allow changes to tables while a backup is in progress.
Which backup strategy should be used?
- A. Online
- B. Offline
- C. Dictionary Only
- D. Skip statistics
Answer: A
Explanation:
An Online backup strategy allows the database to remain accessible and operational while the backup is taking place. This means that users can continue to modify data, and the system can remain available without requiring downtime. It is a common approach for mission-critical systems that need to maximize uptime.
Offline would require the system or certain tables to be unavailable during the backup process, which is not suitable for a system that needs to remain available.
Skip statistics refers to skipping the backup of statistics on database objects and does not relate to whether the system can be updated during the backup.
Dictionary Only involves backing up only the system catalog or dictionary data, not the actual table data, and would not fulfill the requirement of a comprehensive backup while allowing updates.
NEW QUESTION # 25
A user runs a number of large, complex queries that regularly generate insufficient memory errors. The Administrator increases the value of the MaxParseTreeSegs DBS control field in order to allocate more parse tree segments to the parser for parsing requests.
Which action must be taken before the queries will run without memory errors?
- A. The user should log out and log back in to a new session.
- B. Purge the request cache.
- C. Execute an Alter METHOD command for
- D. Execute an OUTPUT command.
Answer: A
Explanation:
When the MaxParseTreeSegs value is increased, the new settings will not take effect for existing sessions. The user must log out and log back in to start a new session where the updated configuration will be applied.
Other options are not relevant in this case.
NEW QUESTION # 26
Which QueryGrid connector can only be a target?
- A. Teradata
- B. Presto
- C. Oracle
- D. Hive
Answer: C
Explanation:
In QueryGrid, the Oracle connector can only be used as a target, meaning data can be sent to an Oracle database but not sourced from it for querying in Teradata Vantage.
Hive, Presto, and Teradata connectors can act as both source and target, allowing data to be retrieved from or sent to these systems as part of a QueryGrid query.
Thus, Oracle is the connector that can only be a target in QueryGrid.
NEW QUESTION # 27
Users are complaining that queries in their workload are taking too long. The Administrator suspects that workload management may be throttling the queries.
Which table should be analyzed to confirm this suspicion?
- A. DBQLStepTbl
- B. ResUsageSps
- C. DBQLogTbl
- D. ResUsageSawt
Answer: D
Explanation:
The ResUsageSawt table captures information related to AMP Worker Task (AWT) usage and workload throttling. If queries are being throttled due to workload management, this table will provide relevant data, including details about tasks that may be waiting due to AWT limits or other resource constraints.
Option A (ResUsageSps) focuses on stored procedure statistics and may not provide direct insight into query throttling.
Option C (DBQLogTbl) logs query-level statistics but does not directly capture information about throttling due to workload management.
Option D (DBQLStepTbl) contains detailed information about query execution steps but, like DBQLogTbl, it does not provide information about throttling.
NEW QUESTION # 28
Which description accurately characterizes the use of external authentication for Vantage?
- A. The directory username must match a database username.
- B. Single Sign-On is available with LDAP authentication.
- C. External authentication is not permitted for mainframe clients.
- D. User authorization roles can also be supplied by the directory.
Answer: D
Explanation:
This is because external authentication systems like LDAP or Active Directory can supply both authentication (verifying the user's identity) and authorization (defining what the user is allowed to do) roles for users.
NEW QUESTION # 29
An update of a very large table was in progress when the system experienced an unplanned restart. After restarting, the system is available, but Recovery Manager shows it may be many hours before a large table is available for use. The Administrator needs to make the table available sooner.
Which option should be used to achieve this goal?
- A. Drop the transaction journal, and set RollbackPriority to TRUE.
- B. Cancel the rollback, and restore the table from backup.
- C. Use Workload Manager to elevate the rollback to the SLG tier.
- D. Use MultiLoad to execute a DROP of the table, and restore it from backup.
Answer: B
Explanation:
When a system experiences an unplanned restart during an update operation, the rollback process can take a significant amount of time, especially for very large tables. Canceling the rollback will stop the system from attempting to undo the incomplete transactions.
After canceling the rollback, the table can be restored from a backup, which is a much faster way to recover the table and make it available for use again.
The other options are less effective:
Use Workload Manager to elevate the rollback to the SLG tier: While this may prioritize the rollback, it doesn't significantly reduce the time required for a large table rollback.
Use MultiLoad to execute a DROP of the table, and restore it from backup: MultiLoad is not typically used for dropping tables, and this adds unnecessary complexity.
Drop the transaction journal, and set RollbackPriority to TRUE: Dropping the transaction journal could lead to data inconsistencies, and setting RollbackPriority to TRUE does not directly make the table available sooner.
NEW QUESTION # 30
An Administrator needs to restrict developers from accessing the Vantage system during the night, between 11:00PM and 05:00AM, but they are permitted to have limited access during the rest of the day.
How should the Administrator accomplish this goal?
- A. Create a Planned Environment that will throttle to zero the concurrency of the developers between 11:00PM and 05:00AM.
- B. Create a health condition that will check which user id is accessing the system, and abort any request that is received between 11:00PM and 05:00AM.
- C. Create a system filter that matches the developers accountstring, and include a classification criteria time window between 11:00PM and 05:00AM.
- D. Change any workloads that developers match to have a throttle count of 0.
Answer: A
Explanation:
A Planned Environment in Teradata Workload Management allows the Administrator to configure different system behaviors based on time windows. By throttling the concurrency of developer workloads to zero between 11:00 PM and 05:00 AM, the Administrator effectively restricts developers from running queries or jobs during that period. Outside of that time window, you can configure a limited concurrency for the developers.
Option A (Create a system filter): A filter can be used to restrict access based on the accountstring, but it isn't the most efficient way to handle time-based restrictions.
Option B (Create a health condition): This would involve more manual intervention and isn't designed for consistent, scheduled access control like Planned Environments.
Option C (Change workloads to have a throttle count of 0): While throttling the workload could work, Planned Environments provide a more flexible and scheduled approach for handling time-based restrictions.
NEW QUESTION # 31
An Administrator has been presented with these performance metrics from the DBQLOGTBL table for four queries:
The Administrator needs to identify which query is suspected to be causing a full table scan or large redistribution.
Which query is producing this result?
- A. QRY_D because of CPU SKEW
- B. QRY_C because of UII
- C. QRY_B because of IO SKEW
- D. QRY_A because of PJI
Answer: C
Explanation:
IO SKEW refers to an uneven distribution of I/O operations across AMPs, which can occur during large redistributions or full table scans, as data needs to be read from or written to the entire table. High IO skew indicates that some AMPs are handling significantly more I/O than others, which is often a sign of inefficient data distribution or full table scanning.
QRY_B has an IO SKEW value of 2.76, which is much higher than the other queries, suggesting that it is likely performing a full table scan or large redistribution, as this would result in uneven I/O across AMPs.
CPU SKEW (as seen in QRY_D) could indicate an issue with CPU load balancing, but it doesn't necessarily suggest a full table scan or redistribution.
UII (Utility Impact Index) and PJI (Product Join Index) are also metrics that might indicate query inefficiencies, but the high IO SKEW in QRY_B is the most direct indicator of a full table scan or large redistribution.
QRY_B is the query suspected of causing the full table scan or large redistribution due to its high IO SKEW value.
NEW QUESTION # 32
A business' operating periods are event-driven, and the batch window begins and ends at various times of the evening. The Administrator needs to configure TASM to dynamically trigger the reporting planned environment using an API call issued when the batch window ends.
Which type of event can the Administrator use to meet this requirement?
- A. System Event
- B. API Event
- C. Period Event
- D. User-Defined Event
Answer: D
Explanation:
User-Defined Event is the appropriate event type in TASM (Teradata Active System Management) for dynamically triggering actions based on custom triggers, such as the completion of an event-driven batch window. This event type allows the administrator to define specific conditions or API calls to trigger changes in the system, such as switching to a reporting planned environment.
The other options:
API Event is not a defined event type in TASM.
System Event is used for events triggered by system-level occurrences, such as system state changes or alerts, but not for custom triggers like batch window completion.
Period Event is based on predefined, fixed time intervals, which wouldn't work for the variable timing of the batch window in this scenario.
NEW QUESTION # 33
Which compression format is supported by NOS?
- A. ZLIB
- B. BZIP
- C. Snappy
- D. ORC
Answer: C
Explanation:
NOS (Native Object Store) supports data compression formats such as Snappy for efficient storage and retrieval of data.
ORC (Optimized Row Columnar) is a file format, not a compression format.
ZLIB is a compression library but is not the primary format used in NOS.
BZIP is a compression format, but it is not widely supported by NOS compared to Snappy.
NEW QUESTION # 34
Which benefit is achieved by creating profiles?
- A. Managing user privileges on database objects
- B. Reducing the growth of the DBC.AccessRights table
- C. Assigning permanent space for groups of users with similar needs
- D. Defining spool space for groups of users with similar needs
Answer: D
Explanation:
Profiles in Teradata are used to manage and enforce resource limits for groups of users. This includes defining spool space, temporary space, and permanent space for users who share similar needs. Spool space is important for query processing, and managing it by profile helps prevent individual users from consuming excessive resources and ensures better overall system performance.
Reducing the growth of the DBC.AccessRights table is not directly related to profiles. Profiles do not reduce access rights or the growth of this table, which tracks individual user privileges.
Managing user privileges on database objects is handled through roles and grants, not profiles. Profiles focus on resource management, not privileges.
Assigning permanent space for groups of users is partially true since profiles can manage some space attributes, but the main focus of profiles is on managing spool space rather than permanent space.
NEW QUESTION # 35
Business users are regularly joining a common set of columns from parquet external data to existing dimension tables. An Administrator needs to improve the performance of these queries where they filter on common columns.
Which strategy can be used to improve performance?
- A. Change the primary index of the foreign server to the filtering columns.
- B. Create a multi-table join index to cover the joined data.
- C. Row partition the parquet table on the filter columns.
- D. Create a foreign server to access the data with column partitioning.
Answer: B
Explanation:
A multi-table join index pre-joins data from multiple tables and stores the result, allowing subsequent queries that perform similar joins to access the pre-joined data directly. This can significantly improve query performance, especially when there is a common set of columns frequently joined between parquet external data and dimension tables.
Option A (Row partition the parquet table on the filter columns): While row partitioning might improve some performance aspects, it's more suited for managing large datasets within Vantage tables and not as effective for parquet external data access.
Option B (Change the primary index of the foreign server to the filtering columns): There is no "primary index" on foreign servers. Foreign data (like parquet) doesn't use Vantage primary index concepts, so this option is not applicable.
Option C (Create a foreign server to access the data with column partitioning): Column partitioning is not typically applicable to external parquet data accessed through a foreign server in the same way it is for native tables. While you can optimize column access, a multi-table join index is more effective for query performance involving frequent joins.
NEW QUESTION # 36
Which spool threshold can an Administrator set to define workload management exception criteria?
- A. Spool Skew
- B. Max Spool Space By AMP
- C. Hot AMP Spool
- D. Maximum Spool Rows
Answer: A
Explanation:
Spool Skew is a threshold that an Administrator can set in workload management to detect and manage uneven distribution of spool space usage across AMPs (Access Module Processors). When spool skew exceeds a certain threshold, it can trigger exception handling or corrective actions, helping to prevent performance degradation caused by unbalanced resource utilization.
The other options are less commonly used for defining workload management exception criteria:
Maximum Spool Rows: This is not a standard threshold for workload management.
Hot AMP Spool: While this refers to uneven spool space usage on a specific AMP, spool skew is the more appropriate term and metric used for setting thresholds.
Max Spool Space By AMP: This isn't a standard workload management threshold. Spool space limits are generally applied system-wide or per user, not by AMP.
NEW QUESTION # 37
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?
- A. WRITE
- B. IREAD
- C. EXCLUSIVE
- D. ROW ACCESS
Answer: A
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 # 38
A role, TestingSprint, was created and assigned to members of a testing unit. This role is temporary in nature and will be dropped after the sprint ends. The manager of the testing unit is also assigned to the role and wants to drop it once work is complete.
Which option can the Administrator use to fulfill this request?
- A. Re-grant the TestingSprint role to the manager, specifying the WITH GRANT OPTION.
- B. Re-grant the TestingSprint role to the manager, specifying the WITH ADMIN OPTION.
- C. Grant the DROP ROLE privilege to the TestingSprint role.
- D. Grant the DROP ROLE privilege to a newly created role, and then grant that role to the manager.
Answer: B
Explanation:
Granting a role with the WITH ADMIN OPTION allows the recipient (in this case, the manager) to not only use the role but also manage it. This includes the ability to drop the role when it is no longer needed, as requested by the manager.
NEW QUESTION # 39
BATCH_USER submits stored procedures, utility jobs, and other requests. All BATCH_USER work classifies into workload WD-Batch based on username criterion.
System performance has slowed due to AWT exhaustion during the batch window. The Administrator determined the AWT exhaustion is due to high concurrency of stored procedure calls from BATCH_USER.
How can the Administrator effectively throttle these stored procedures?
- A. Define an AWT resource limit, classify on username = BATCH_USER and utility = Stored Procedure, and set the limit.
- B. Create a new workload, classify on username = BATCH_USER and statement type = CALL, and set a throttle.
- C. Create a utility limit, classify on username = BATCH_USER and utility = Stored Procedure, and set the limit.
- D. Define a system throttle, classify on username = BATCH_USER and stored procedure = *.*, and set the limit.
Answer: B
Explanation:
In this scenario, the issue arises due to high concurrency of stored procedure calls, which are exhausting AWTs (AMP Worker Tasks). To address this, the administrator needs to throttle the specific stored procedure calls made by BATCH_USER. The most effective way to do this is to create a new workload that specifically targets those calls (statement type = CALL) from BATCH_USER and then applies a throttle to limit concurrency. This helps manage the system's AWTs by controlling how many stored procedures can be run concurrently.
Other options are less suitable as they either do not target stored procedures specifically or may not provide the necessary granularity in controlling AWT usage for stored procedure calls.
NEW QUESTION # 40
How can an Administrator monitor the data volume that is transferred for a Data Mover job via Viewpoint?
- A. By using the Data Mover portlet accessing the log tab
- B. By submitting the datamove status -job_name command in the remote console
- C. By accessing the Completed Queries portlet and selecting the Data Mover job
- D. By viewing the job statistics tab of the Performance Data Collection portlet
Answer: A
Explanation:
The Data Mover portlet in Viewpoint provides specific functionality for managing and monitoring Data Mover jobs. By accessing the log tab within the Data Mover portlet, the Administrator can review detailed logs, including the data volume that was transferred during the job execution.
Option A (Completed Queries portlet) focuses on monitoring and analyzing completed queries but does not provide detailed insights into Data Mover jobs.
Option C (Performance Data Collection portlet) is used for monitoring system performance but is not directly related to Data Mover job details or data transfer volumes.
Option D (datamove status command) is a CLI (Command-Line Interface) method to check job status, but it is not related to monitoring the data volume within the Viewpoint environment.
NEW QUESTION # 41
An Administrator has been asked to improve the response time of the workloads in the tactical tier. Workloads are in all tiers of TASM. They are at CPU and I/O capacity, and they have AWT reserved for tactical. The Administrator begins by analyzing the data and the workload prioritization.
Which action should the Administrator take?
- A. Disable the expedite option of the workloads in the SLG Tier level 1.
- B. Increase the number of AWTs.
- C. Increase the relative weight of the tactical tier.
- D. Adjust the limits of awt concurrency in the tactical tier using DBS control.
Answer: C
Explanation:
In a TASM (Teradata Active System Management) environment, the relative weight of different tiers (such as tactical, SLG, or background) determines the amount of CPU and I/O resources allocated to each tier. Increasing the relative weight of the tactical tier would prioritize these workloads, giving them more resources relative to other tiers and improving their response time.
Option B (Disable the expedite option of the workloads in the SLG Tier level 1) might alleviate some resource pressure from SLG Tier 1 workloads, but it doesn't directly improve the prioritization or resource allocation for tactical workloads.
Option C (Increase the number of AWTs) is not applicable because the system already has reserved AWTs for tactical workloads, and AWT (AMP Worker Task) availability is likely not the bottleneck here. Simply increasing the number of AWTs without addressing the core CPU and I/O resource allocation will not improve tactical workload response.
Option D (Adjust the limits of AWT concurrency in the tactical tier using DBS control) might provide marginal improvements but won't have a significant impact on overall resource prioritization. It focuses more on concurrency management than directly improving workload performance through resource allocation.
NEW QUESTION # 42
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