Free 1z0-908 Exam Dumps

Question 11

You have just installed MySQL on Oracle Linux and adjusted your /etc/my.cnf parameters to suit your installation.
Examine the output:
1Z0-908 dumps exhibit
What statement is true about the start attempt?

A. MySQL server was not started due to a problem while executing process 2732.
B. MySQL server continued to start up even though another process existed.
C. systemd found the mysqld service disabled and failed to start it.
D. systemd waited for 30 seconds before timing out and start up failed.
E. systemd attempted to start mysqld, found another systemd mysqld process running, and shut it down.

Correct Answer:E

Question 12

t is a non-empty InnoDB table.
Examine these statements, which are executed in one session:
BEGIN;
SELECT * FROM t FOR UPDATE;
Which is true?

A. mysqlcheck --analyze --all-databases will execute normally on all tables and return a report.
B. If OPTIMIZE LOCAL TABLE t; is invoked from another session, it executes normally and returns the status.
C. If ANALYZE TABLE; is invoked from the same session, it hangs until the transaction is committed or rolled back.
D. If OPTIMIZE TABLE; is invoked, it will create a table lock on t and force a transaction rollback.

Correct Answer:B

Question 13

Examine this query:
1Z0-908 dumps exhibit
What information does this query provide?

A. total memory used across all connections associated with the user on connection number 10
B. total memory used by thread number 10
C. total memory used by the first 10 threads
D. total memory used across all connections associated with the user on thread number 10
E. total memory used by connection number 10
F. total memory used by the first 10 connections

Correct Answer:E

Question 14

Examine this statement, which executes successfully:
1Z0-908 dumps exhibit
You want to improve the performance of this query:

Which change enables the query to succeed while accessing fewer rows?

A. ALTER TABLE world.city ADD SPATIAL INDEX (Name);
B. ALTER TABLE world.city ADD SPATIAL INDEX (Population);
C. ALTER TABLE world.city ADD INDEX (Population);
D. ALTER TABLE world.city ADD INDEX (Name);
E. ALTER TABLE world.city ADD FULLTEXT INDEX (Name);
F. ALTER TABLE world.city ADD FULLTEXT INDEX (Population);

Correct Answer:B
Reference: https://dev.mysql.com/doc/refman/5.7/en/creating-spatial-indexes.html

Question 15

Which statement is true about InnoDB persistent index statistics?

A. Updating index statistics is an I/O expensive operation.
B. Index statistics are calculated from pages buffered in the buffer pool for tables with InnoDB storage engine.
C. Setting innodb_stats_auto_recalc=ON causes statistics to be updated automatically when a new index is created.
D. Execution plans based on transient index statistics improve precision when innodb_stats_persistent_sample_pages is increased.
E. Increasing innodb_stats_persistent_sample_pages determines higher pages scanning speed, at the cost of increased memory usage.
F. Tables are scanned and index statistics recalculated when an instance is restarted.

Correct Answer:D
Reference: https://mariadb.com/kb/en/innodb-persistent-statistics/