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TeraData HCIA-Datacom V1.0 Sample Questions (Q18-Q23):

NEW QUESTION # 18
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. Execute an Alter METHOD command for
B. The user should log out and log back in to a new session.
C. Execute an OUTPUT command.
D. Purge the request cache.

Answer: B

NEW QUESTION # 19
An Administrator manages a Vantage system that experiences large loads and updates during the night, on weekdays. On Saturday night, significant analytical processing occurs using the data from the prior weeks. The results of this processing are saved to support rapid reporting in the following week.
The business requires this Vantage system to be available as soon as possible in case of a catastrophic system failure.
Which backup strategy meets this need?

A. Daily full backups
B. Weekly cumulative backup on Sunday and Wednesday, and delta backups on the remaining days
C. Daily delta backups
D. Weekly full backup, cumulative backups on Tuesday and Friday, and delta backups on the remaining days

Answer: D

Explanation:
This strategy strikes a balance between minimizing recovery time and reducing the overall storage and performance impact during backups.
Weekly full backup ensures that a complete copy of the data is available at the start of the week, which is critical for quick recovery in the event of a catastrophic system failure.
Cumulative backups on Tuesday and Friday ensure that any changes made since the last full backup are captured without needing to apply multiple delta backups, reducing the time required for restoration.
Delta backups on other days provide incremental backups of the system with minimal performance impact, ensuring the system is consistently backed up without using excessive resources.

NEW QUESTION # 20
The Administrator has received a request to add SELECT rights on the BusinessViews database to end users, developers, and batch accounts in the accounting unit. The following roles are set up for each group:

The Administrator created the AcctShared role and will use it in a role nesting strategy to provide the required access.
Which actions can the Administrator take to fulfill this request?

A. Grant SELECT on BusinessViews to AcctShared, then grant AcctUsers, AcctDev, and AcctBatch to AcctShared.
B. Grant SELECT on AcctShared to BusinessViews, then grant AcctShared to AcctUsers. AcctDev, and AcctBatch.
C. Grant SELECT on AcctShared to BusinessViews, then grant AcctUsers, AcctDev, and AcctBatch to AcctShared.
D. Grant SELECT on BusinessViews to AcctShared, then grant AcctShared to AcctUsers. AcctDev, and AcctBatch.

Answer: D

Explanation:
The AcctShared role should be granted SELECT access on the BusinessViews database. This ensures that the role itself has the necessary privileges.
Then, you can nest this role by granting AcctShared to the individual roles of AcctUsers, AcctDev, and AcctBatch. This role nesting strategy allows the users in these groups to inherit the permissions from AcctShared without having to directly grant the privileges to each individual role.
This approach maintains a clean and efficient permission structure using role nesting.

NEW QUESTION # 21
A client is having many problems with a poorly written SQL. They have product joins running against large tables, and this is causing severe performance issues. The Administrator needs to help the client avoid the harm to the system that is being caused by running these queries.
Which action should be taken by the Administrator to assist this client?

A. Use the Query Log Viewpoint portlet to identity and abort the harmful queries.
B. Use a TASM system filter.
C. Use the Flex Throttle option.
D. Use the Query Spotlight Viewpoint portlet to deprioritize the queries.

Answer: B

Explanation:
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.

NEW QUESTION # 22
A customer is complaining that the creation of a large table in the lab environment is getting stuck in the merge step. The customer is using the following command to create the table:
CREATE TABLE ... AS (SELECT * ...) WITH DATA
Which recommendation will help the merge step?

A. Users of the lab may have lower priority than other workloads, so the creation of the table should be moved to off-peak hours.
B. A column that provides good distribution should be specified as PRIMARY INDEX.
C. The table should be created with "CREATE TABLE ... AS (SELECT *...) WITH NO DATA", and afterwards, "INSERT ... SELECT *" should be used to fill the table.
D. The MERGEBLOCKRATIO should be specified for the table to improve the data block merge operation.

Answer: C

Explanation:
Merge step issues often occur when a large amount of data is being processed during the table creation, especially if the system is trying to simultaneously create the table and insert data.
By using "WITH NO DATA", the table structure is created first, without the actual data being inserted during the table creation process. The *"INSERT ... SELECT " command can then be used afterwards to populate the table in a more controlled way, reducing the load on the system during the creation phase and potentially improving the efficiency of the merge step.
Specifying a good distribution for the primary index can help overall performance, but it doesn't directly address the issue with the merge step in this scenario.
Specifying the MERGEBLOCKRATIO isn't typically a solution for this specific problem; the merge block ratio is more about the optimization of data block merges rather than the creation of tables.
Moving the creation to off-peak hours may help if the environment is busy, but it doesn't directly address the core issue of the merge step getting stuck.

NEW QUESTION # 23
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