[Q36-Q54] Huawei H13-921_V1.5 Dumps Updated [Mar-2026] Get 100% Real Exam Questions!

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NEW QUESTION 36
If an administrator finds that the InnoDB read cache hit rate is low in GaussDB (for MySQL), what should be optimized first?

Change network configuration

Change CPU specification

Optimize SQL statements

Increase buffer size

NEW QUESTION 37
Which statements about Schema are correct?

Equivalent to user, separates object ownership

Collection of DB objects, logical grouping for management

Search order is based on creation time

Forms a namespace to avoid naming conflicts

NEW QUESTION 38
User sessions correspond to user connection threads – one session equals one connection thread.

True

False

NEW QUESTION 39
A database administrator received a “cannot connect” error. Diagnosis revealed that a new business caused client connections to exceed the preset limit. Which parameter should be adjusted to fix the error?

max_connect_errors

max_connections

max_user_connections

connect_timeout

NEW QUESTION 40
Which of the following window functions are supported by GaussDB (for MySQL)?

LEAD()

MIDDLE_VALUE()

FIRST_VALUE()

LAG()

NEW QUESTION 41
GaussDB (for MySQL) allows backup policy configuration in Huawei Cloud Console. Which of the following cannot be modified?

Retention days

Backup time window

Automatic backup switch

Backup cycle

NEW QUESTION 42
SQL statements exceeding slow_launch_time are recorded in the slow SQL log.

True

False

NEW QUESTION 43
Huawei Cloud DAS (Cloud DBA) provides intelligent monitoring, diagnostics, and optimization to ensure stable DB operation.

True

False

NEW QUESTION 44
The regex function REGEXP_INSTR returns the starting index of a substring matching the regex. If return_option=1, it returns the last matched position.

True

False

NEW QUESTION 45
In GaussDB (for MySQL), session and connection are the same concept.

True

False

NEW QUESTION 46
When using “Full SQL Insight,” DAS must be enabled to collect all SQL. After enabling, what is the performance overhead within?

NEW QUESTION 47
Which statements about storage engines are correct?

Different engines provide different mechanisms, indexes, lock levels, etc.

Storage engine is the DBMS’s bottom layer software responsible for creation, queries, updates

Storage engine determines data access mode, directly affecting read/write performance

Each storage engine has unique formats, scenarios, and limitations

NEW QUESTION 48
Which of the following are core functions of the UGO database migration tool?

Application SQL migration

Database schema migration

Migration workload assessment

Target database selection & spec recommendation

NEW QUESTION 49
EXPLAIN cannot show the impact of triggers, stored procedures, or user-defined functions.

True

False

NEW QUESTION 50
Which are advantages/features of GaussDB (for MySQL)?

High performance: 7x native MySQL

High scalability: up to 1 primary + 15 standbys, read/write separation, load balancing

Massive storage: up to 128TB capacity

Compute-storage separation: independently scalable resources

NEW QUESTION 51
An e-commerce platform is experiencing a surge in users and needs a database architecture with optimal parallel processing and scalability. Which architecture should be enabled?

Shared-Disk

Shared-Memory

Shared-Everything

Shared-Nothing

NEW QUESTION 52
Which type of tree does the InnoDB engine use by default to store index information?

B-Tree

Binary Tree

Balanced Binary Tree

B+ Tree

NEW QUESTION 53
The command show [session|global] status defaults to “global”.

True

False