Online Access Free Oracle.1Z0-888.v2022-02-17.q133 Practice Test (Page 6)

1Z0-888 Exam Question 21

What is the order of tables shown in an EXPLAINoutput?

A.It lists tables from the smallest to the largest.

B.It lists tables in the order in which their data will be read.

C.It lists tables from the most optimized to the least optimized.

D.It lists tables in the order in which they are specified in the statement that is being explained.

1Z0-888 Exam Question 22

You have a MySQL instance with the following variables in the /etc/my.cnffile:

You issue these statements:
USE prices;
UPDATE sales.january SET amount=amount+1000;
An hour after excluding the statements, you realize that you made a mistake and you want to go to the binary log and look at the statements again.
Which statement is true? (Choose two.)

A.The statement would fail because you cannot update more than one row at a time when using -- binlog-format = ROW.

B.You would receive an error on the statement because you cannot update a different database that what is specified with the USEstatement.

C.The changes caused by the UPDATEstatement are logged to the binary log because the instance is using --binlog-format = ROW

D.Nothing was written to the binary log because you cannot perform a calculation in a query without enclosing the statement in single quotation marks.

E.Nothing is logged because you are executing an UPDATE statement that will cause changes to more than one row, and you do not have the --binlog-formatvalue set to STATEMENT.

1Z0-888 Exam Question 23

old_alter_table is disabled as shown.
mysql> SELECT @@old_alter_table;

Consider this statement on a RANGE-partitioned table:
mysql> ALTER TABLE orders DROP PARTITION p1, p3;
What is the outcome of executing this statement?

A.All data in p1 and p3 partitions is removed, but the table definition remains unchanged.

B.It results in a syntax error because you cannot specify more than one partition in the same statement.

C.Only the first partition (p1) will be dropped because only one partition can be dropped at any time.

D.All data in p1 and p3 partitions is removed and the table definition is changed.

1Z0-888 Exam Question 24

You are using replication and the binary log files on your master server consume a lot of disk space.
Which two steps should you perform to safely remove some of the older binary log files? (Choose two.)

A.Execute the PURGE BINARY LOGS NOT USED command.

B.Edit the .index file to remove the files you want to delete.

C.Ensure that none of the attached slaves are using any of the binary logs you want to delete.

D.Remove all of the binary log files that have a modification date earlier than today.

E.Use the command PURGE BINARY LOGS and specify a binary log file name or a date and time to remove unused files.

1Z0-888 Exam Question 25

Consider the key buffer in a MySQL server. Which two statements are true about this feature? (Choose two.)

A.It caches index blocks for all storage engine tables.

B.It is set on a per-connection basis.

C.It caches index blocks for InnoDB tables only.

D.It is a global buffer.

E.It caches index blocks for MyISAM tables only.

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1Z0-888 Exam Question 21

1Z0-888 Exam Question 22

1Z0-888 Exam Question 23

1Z0-888 Exam Question 24

1Z0-888 Exam Question 25

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