Examine these commands and output:

Which connection ID is holding the metadata lock?

You reconfigure and start a slave that was not replicating for several days.
The configuration file and CHANGE MASTER command are correct. Examine the GTID information from both master and slave:

Which statement is true?

Examine this statement and output:

You must try to reduce query execution time.
Which two queries should you focus on? (Choose two.)

Examine these statements, which execute successfully:
TRUNCATE test; BEGIN;
INSERT INTO test(id, name) VALUES(1, "Hello"); ROLLBACK;
SELECT id FROM test;
Which three storage engines would return a nonempty recordset for the test table when executing the statements? (Choose three.)

Which three are characteristics of a newly created role? (Choose three.)