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MySQL 5.7 Database Administrator Questions and Answers

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Question 1

Consider the join_buffer_size parameter in MySQL Server.

Which two statements are true about the join buffer? (Choose two.)

Options:

A.

The value should be increased if the client performs several SELECT operations.

B.

The join buffer is set per connection.

C.

The join buffer is used to process sorts when complex joins are being performed.

D.

The value should be increased from the default if the query joins large rows without using an index.

E.

The join buffer is global and can be changed only by restarting the server.

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Question 2

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 3

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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