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1z0-888 Exam Dumps : MySQL 5.7 Database Administrator

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MySQL 5.7 Database Administrator Questions and Answers

Question 1

A MySQL instance has this configuration values set:

A transaction involving a single InnoDB INSERT statement commits.

Which list of locations is in the sequence of disk writes for this transaction?

Options:

A.

binary log, redo log, doublewrite buffer, and tablespace

B.

redo log, binary log, doublewrite buffer, and tablespace

C.

doublewrite buffer, redo log, tablespace, and binary log

D.

redo log, doublewrite buffer, tablespace, and binary log

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Question 2

Consider:

Which statement best describes the meaning of the values in the ref columns?

Options:

A.

world.City.CountryCode is used as the primary key for the Country table.

B.

No indexed columns are used to select rows from the City table. The world.City.CountryCode column is used to select rows in the Country table.

C.

world.City.CountryCode is used to sort the rows in the City table.

D.

No indexed columns are used to select rows from the Country table. The world.City.CountryCode column is used to select rows in the City table.

Question 3

Which two statements are true about InnoDB auto-increment locking? (Choose two.)

Options:

A.

InnoDB never uses table-level locks.

B.

InnoDB always protects auto-increment updates with a table-level lock

C.

InnoDB does not use locks to enforce auto-increment uniqueness.

D.

The auto-increment lock can be a table-level lock.

E.

Some settings for innodb_autoinc_lock_mode can help reduce locking.