NEW TDVAN5 DUMPS PDF & VALID TDVAN5 EXAM GUIDE

New TDVAN5 Dumps Pdf & Valid TDVAN5 Exam Guide

New TDVAN5 Dumps Pdf & Valid TDVAN5 Exam Guide

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TeraData HCIA-Datacom V1.0 Sample Questions (Q25-Q30):

NEW QUESTION # 25
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 # 26
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. A column that provides good distribution should be specified as PRIMARY INDEX.
  • B. The MERGEBLOCKRATIO should be specified for the table to improve the data block merge operation.
  • C. Users of the lab may have lower priority than other workloads, so the creation of the table should be moved to off-peak hours.
  • D. The table should be created with "CREATE TABLE ... AS (SELECT *...) WITH NO DATA", and afterwards, "INSERT ... SELECT *" should be used to fill the table.

Answer: D

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 # 27
An Administrator wants to see the list of foreign servers and their parameters in a Teradata QueryGrid configuration for a Vantage system.
Which database shows this information?

  • A. TD_SERVER_DB
  • B. TD_SYSFNLIB
  • C. SECADMIN
  • D. TD_FOREIGN_DB

Answer: A

Explanation:
TD_SERVER_DB contains the metadata for foreign servers and their configurations in a Teradata QueryGrid environment. This includes information about the foreign servers and their associated parameters, which is useful for managing and monitoring QueryGrid connections.
The other options are not directly relevant for this purpose:
TD_SYSFNLIB contains system functions and is unrelated to QueryGrid server configurations.
TD_FOREIGN_DB is not a valid database in the context of QueryGrid configuration.
SECADMIN is related to security and user management but does not contain information about foreign servers in QueryGrid.


NEW QUESTION # 28
Which option in READ_NOS will reduce the number of objects scanned by queries?

  • A. ACCESS_KEY
  • B. FULLSCAN
  • C. LOCATION
  • D. BUFFERSIZE

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 # 29
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?

  • A. REQPHYSIO and UII
  • B. TOTALIOCOUNT and PJI
  • C. MAXAMPIO and PJI
  • D. I/O SKEW % and UII

Answer: B

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 # 30
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