mysql8.0英文考试第1-5题

Q1. Examine this command, which executes successfully:

mysqlbackup --user=dba --password --port=3306 --with-timestamp --backup-dir=/export/backups backup-and-apply-log

Which statement is true?

A)The backup accesses the MySQL server files by using a pre-existing connection.

B)The database server is put into a read-only state for the duration of the backup.

C)An offline backup of InnoDB tables is taken.

D)The backup can be impacted when DDL operations run during the backup.

详解:

参见《MySQL8.0 for Database Administrators studentGuide 2》243页

While the non-InnoDB backup runs:

--- Prior to version 8.0.16, the database cannot be modified

--- As of version 8.0.16, only non-InnoDB tables cannot be modified and InnoDB tables allow DML operations but not DDL operations

Answer:D

Q2.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:

Master:

Gtids_executed: aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa:1-321,

bbbbbbbb-bbbb-bbbb-bbbbbbbbbbbb:1-50,

Cccccccc-cccc-cccc-cccc-cccccccccccc:1234-1237

Gtids_purged: aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa:1-100,

bbbbbbbb-bbbb-bbbb-bbbbbbbbbbbb:1-10,

cccccccc-cccc-cccc-cccc-cccccccccccc:1234-1237

Slave:

Gtids_executed: aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa:1-160,

cccccccc-cccc-cccc-cccc-cccccccccccc:1234-1237

Gtids_purged: aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa:1-70,

cccccccc-cccc-cccc-cccc-cccccccccccc:1234-1237

Which statement is true?

A)Replication will fail because the master does not have the required transaction with bbbbbbbb-bbbb-bbbb-bbbb-bbbbbbbbbbbb GTIDs in its binary logs.

B)Replication will fail because the master has already purged transactions with cccccccc-cccc-cccc-cccc-cccccccccc GTIDs.

C)Replication will fail because of inconsistent numbers in cccccccc-cccc-cccc-cccc-cccccccccccc GTIDs.

D)Replication will fail because the slave has purged more aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa transactions than the master.

F)Replication will work.

Answer:A

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