Pass the Teradata Vantage Master 2.0 TDVAN5 Questions and answers with ExamsMirror

Batch-level functions often involve creating and modifying tables as part of large data loads or updates. To allow the new user to perform these functions, the Administrator should assign them a profile that grants appropriate permissions, such as the CREATE TABLE privilege on the Tables_Database, where base tables are stored.

Profiles are a common way to manage and control resource and security settings for users in Teradata, and assigning a profile with the CREATE TABLE privilege ensures that the user can create tables in the specified database without granting excessive privileges.

Option A (Grant the CHECKPOINT privilege on the Tables_Database): The CHECKPOINT privilege is related to checkpointing transactions, which is not directly relevant to batch-level functions involving table creation or modification.

Option B (Set the user’s default role to one that has the CREATE TABLE privilege): While setting a default role can grant privileges, using a profile is a more scalable way to manage user resource and privilege settings, especially if the profile already exists with the necessary permissions.

Option D (Grant the CHECKPOINT privilege on the Tables_Database to the new user’s profile): Again, the CHECKPOINT privilege is not directly related to the batch-level activities such as creating tables.

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.

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.

Inherited privileges are those that a user acquires based on their membership in a profile or role. In this case, the user has been assigned a profile that grants access to sensitive data, meaning the privilege to access that data is inherited through the profile.

Option B (Ownership) refers to the privileges that the creator (owner) of a database object has over that object, but in this case, the user is accessing data through a profile, not ownership.

Option C (Automatic) would suggest that the privilege is granted automatically without the need for an explicit assignment or inheritance, which doesn't apply here because the privileges are coming from a profile.

Option D (Assigned) refers to direct privileges granted to a user individually, but in this scenario, the user is accessing data through a profile, which means the privileges are inherited rather than directly assigned.

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.

WIO (Work in I/O) is at 25%, which indicates that the system is spending a significant amount of time waiting for I/O operations to complete. This suggests that I/O is the most constrained resource in this scenario. A high WIO typically points to I/O bottlenecks, causing delays in processes like data loading.

The other resources appear to be less constrained:

CPU: The system is busy with 75% CPU usage, which indicates the CPU has available capacity (not fully utilized).

BYNET: With 10% BYNET usage, there is no indication of network congestion.

Parallelism: Inter-AMP parallelism is at 90%, which suggests that parallel processing is functioning well and not the bottleneck.

Thus, the data load slowdown is likely due to I/O constraints, making I/O the most constrained resource in this case.

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.

The Lock Display portlet in Teradata Viewpoint provides detailed information about database locks. It allows the Administrator to monitor if any queries or jobs are causing lock contention that could block the critical job. Using this portlet, the Administrator can see if the development jobs are creating locksthat delay or block the critical job. If such blocking is detected, the Administrator can take action, such as aborting the development jobs.

Option A (Query Session) shows information about active sessions but is not focused on lock contention and blocking.

Option B (Query Monitor) allows the monitoring of query performance and workloads but doesn't specifically focus on lock contention.

Option C (Show Locks) can display current lock information, but Lock Display provides a more comprehensive tool for monitoring and managing lock-related issues.

Teradata Active System Management (TASM) allows the system administrator to control and manage query workload in real-time. A TASM system filter can be used to prevent or deprioritize certain types of queries, such as product joins or poorly written queries, that are consuming excessive resources. This approach ensures that problematic queries do not harm the overall system performance.

Query Spotlight Viewpoint portlet focuses on identifying and managing individual queries but does not provide the same level of proactive filtering and control as TASM system filters.

Flex Throttle is useful for controlling the concurrency of queries, but it doesn't specifically address preventing or managing product joins in a way that would directly resolve the issue with poorly written SQL.

Query Log Viewpoint portlet would help in identifying and aborting harmful queries, but it's a reactive approach rather than a proactive solution like using TASM system filters.

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.