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首页MySQL 5.7 OCP考试认证题库-答案与解析完整版

MySQL 5.7 OCP考试认证题库-答案与解析完整版

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The MySQL 5.7 OCP exam certification question bank includes answers and explanations for candidates preparing for the exam. One of the questions that may appear on the exam is about a MySQL database that uses all InnoDB tables and is configured in a specific way. In this scenario, the database is set up with certain parameters and settings that impact its performance and functionality. To successfully pass the MySQL 5.7 OCP exam, candidates need to have a thorough understanding of various concepts related to database management using MySQL. This includes knowledge of how InnoDB tables work, as well as how to configure and optimize a MySQL database for better performance. The exam may also test candidates on their ability to troubleshoot common issues that may arise in a MySQL database and how to effectively use tools and commands for managing and querying data. Candidates preparing for the exam can benefit from practicing with the question bank, which provides them with a range of questions covering different topics related to MySQL 5.7 OCP certification. The bank also includes detailed answers and explanations to help candidates understand the reasoning behind each correct answer, as well as common pitfalls to avoid. In conclusion, the MySQL 5.7 OCP exam certification question bank is a valuable resource for candidates looking to enhance their knowledge and skills in managing MySQL databases. By practicing with the question bank and understanding the answers and explanations provided, candidates can improve their chances of passing the exam and earning their certification.

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#从机不能足够快地处理中继日志以使用所有线程。

F. The server needs more cores to use all slave threads.

#服务器需要更多的内核来使用所有的从线程。

Answer: B,C

Question: 25

A master-slave replication setup has the slave showing this error:

#主从复制设置使从复制显示此错误：

What could explain this error? (Choose two.)

#什么能解释这个错误？（选择两个。）

A. binlog_cache_size=1024 is too small and transactions are lost.

# binlog_cache_size=1024 太小，事务丢失。

B. binlog_format=STATEMENT and a non-deterministic query was executed.

# B.binlog_format= STATEMENT，执行了一个不确定的查询。

C. enforce_gtid_consistency=ON and consistency is broken between the master and the slave.

# C.enforce_gtid_consistency=打开，主设备和从设备之间的一致性被破坏。

D. The sync_relay_log=1000 setting on the slave is too small.

# D.从机上的 sync_relay_log=1000 设置太小。

E. sync_binlog=0 and the master server crashed.

# E.sync_binlog=0，主服务器崩溃。

Answer: CE

如果是单选，只选 E

Question: 26

What two statements are true regarding FLUSH TABLES FOR EXPORT?

#关于导出的刷新表，哪两个语句是正确的？

A. It can be used to export TEMPORARY tables.

# A.可用于导出临时表。

B. Table only exports when the table has its own tablespace.

# B.只有当表有自己的表空间时才导出表。

C. The InnoDB Storage engine must be used for the table being exported.

# C.要导出的表必须使用 InnoDB 存储引擎。

D. It is the safest way to extract tables from the shared tablespace.

#从共享表空间中提取表是最安全的方法。

E. Partitioned tables are not supported.

# E.不支持分区表。

Answer: BC

Question: 27

Consider the two partial outputs of the SHOW GLOBAL VARIABLES command from a master and

slave server:

#考虑来自主服务器和从服务器的 SHOW GLOBAL VARIABLES 命令的两个部分输出：

Master:

Slave:

There is a problem with the slave replicating from the master. Which statement describes the

cause of the problem?

#从主服务器复制从服务器时出现问题。哪个语句描述了问题的原因？

A. The log_bin variable is set to OFF on the slave.

# A.从机上的 log_bin 变量设置为 OFF。

B. server_id is not unique.

# B.服务器 id 不唯一。

C. The max_connections variable on the slave needs to be increased.

#需要增加从机上的 max_connections 变量。

D. The shared_memory_base_name variable must match the master.

# D.shared_memory_base_name 变量必须与 master 匹配。

E. The version of the slave is newer that the version of the master.

#从机版本比主机版本更新。

Answer: B

Question: 28

The MySQL error log shows:

InnoDB: Warning: a long semaphore wait:

The relevant parts of the InnoDB monitor output shows:

# MySQL 错误日志显示：

InnoDB:警告：长信号量等待

InnoDB 监视器输出的相关部分显示：

Which two options would help avoid the long wait in the future?

#哪两种选择有助于避免未来漫长的等待？

A. Increase the value of the innodb_lock_wait_timeout option.

# A.增加 innodb_lock_wait_timeout 选项的值。

B. Increase the value of the innodb_read_io_threads option.

# B.增加 innodb_read_io_threads 选项的值。

C. Change the table to use HASH indexes instead of BTREE indexes.

#将表更改为使用哈希索引而不是 BTREE 索引。

D. Set the value of innodb_adaptive_hash_index to zero.

# D.将 innodb_adaptive_hash_index 的值设置为零。

E. Deactivate the query cache.

# E.停用查询缓存。

F. Increase the size of the InnoDB buffer pool.

# F.增加 InnoDB 缓冲池的大小。

Answer: DE

Question: 29

Examine the mydata table and SELECT statements:

#检查 mydata 表并选择语句：

You issue:

mysql> begin;

mysql> update mydata set a=0 where b=3;

How many rows are now protected by locks with the default InnoDB configuration?

#现在有多少行被默认 InnoDB 配置的锁保护？

A. one

B. one row and a next-key lock for supremum

C. one row and a gap-lock

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