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MYSQL MySQL 5.0 Database Administrator Certified Professional Exam, Part II Sample Questions:
1. Which of the following best describes what mysqldumpslow does and how to use it? (Choose two)
A) Shell> mysqldumpslow < log_name
B) Shell> mysqldumpslow log_name
C) It shows a summary of the slow log contents.
D) It dumps the contents of the slow log into a readable format.
2. Consider the following:
mysql> EXPLAIN SELECT Name FROM City WHERE CountryCode = (SELECT Code FROM
Country
WHERE Name = 'United States')
*************************** 1. row ***************************
id: 1
select_type: PRIMARY
table: City
type: ALL
possible_keys: NULL
key: NULL
key_len: NULL
ref: NULL
rows: 4079
Extra: Using where
Which of the following best describes the meaning of the value of the select_type column?
A) It is the first SELECT in a subquery.
B) The query has a subquery.
C) The outer select is the SELECT referred to in the output row.
D) The inner select is the SELECT referred to in the output row.
3. What will be the results of the following query? (Choose three)
mysql> SELECT * FROM CountryLanguage PROCEDURE ANALYSE(10, 256)
A) It will result in an error.
B) For each column of the CountryLanguage table, the average value or average length will be listed.
C) For each column of the CountryLanguage table, the data type will be changed to one that is just large enough to hold the data.
D) For each column of the CountryLanguage table, a data type will be suggested that is just large enough to hold the data.
E) For each column of the CountryLanguage table, the minimum and maximum values will be listed.
4. Which of the following best describes the effect that the per-process limit of open file descriptors in an operating system has on MySQL, and what can be done to increase it? (Choose two)
A) It limits the amount of operations MySQL can perform at one time.
B) The --open-files-limit option can be used to increase it.
C) It limits the maximum size of the table cache that holds file descriptors.
D) The operating system may be able to be reconfigured to increase this limit.
5. Which of the following best describes the purpose of the join buffer, and when should you increase the size of it? (Choose three)
A) The join buffer is used to process sorts when complex joins are being performed.
B) The join buffer is used to process joins.
C) The join buffer is global and can only be changed by restarting the server.
D) The join buffer is set per-connection.
E) The value should be increased if the client has the tendency to perform complex joins.
F) The value should be increased if the client performs a lot of SELECT operations.
Solutions:
| Question # 1 Answer: B,C | Question # 2 Answer: C | Question # 3 Answer: B,D,E | Question # 4 Answer: C,D | Question # 5 Answer: B,D,E |
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