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Question 12

In which order does MySQL process an incoming INSERT statement?

Options:

A.

It checks whether the user is authorized to perform the query, writes to the binary log, and then optimizes it.

B.

It checks whether the user is authorized to perform the query, optimizes it, and then writes to the binary log.

C.

It writes the query to the binary log, optimizes it, and then checks whether the user is authorized to perform the query.

D.

It optimizes the query, checks whether the user is authorized to perform it, and then writes to the binary log.

Question 13

You are investigating the performance of the server and see this information:

  • events_waits_summary_global_by_event_name in the Performance Schema shows that the wait/synch/mutex/sql/LOCK_table_cache event is dominating other wait events.
  • The Table_open_cache_overflows status variable is 0.

Which action should be taken to remove the performance bottleneck described here?

Options:

A.

Increase the value of table_open_cache_instances.

B.

Decrease the value of table_definition_cache.

C.

Decrease the value of table_open_cache.

D.

Increase the value of table_definition_cache.

E.

Increase the value of table_open_cache.

F.

Decrease the value of table_open_cache instances.

Question 14

One of your colleagues is trying to make a change using the mysql command-line client for his or her application session.

The colleague instant messages you this command:

mysql> SET SESSION max_connections = 200;

Why does the command fail?

Options:

A.

max_connections requires the GLOBAL scope.

B.

Its current user does not have the SUPER privilege.

C.

max_connections is not a dynamic variable. You need to change the config file and restart the database.

D.

Users can control only the max_user_connections variable.

Question 15

After analysis on the slow query log on a high-end OLTP service, the table identified in the slow queries is:

What are the two most likely reasons for the slowness given this output? (Choose two.)

Options:

A.

Date should be a TIMESTAMP field for better performance.

B.

The User field is too long for most names.

C.

The engine type is not appropriate to the application use.

D.

Using default values for DATETIME causes table scans.

E.

No indexes are defined.

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Changed 1z0-888 Exam Questions, 1z0-888 Reviews Questions, Pass 1z0-888 Exam Guide,
Exam Code: 1z0-888
Exam Name: MySQL 5.7 Database Administrator
Last Update: Nov 21, 2024
Questions: 124
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