2014年5月5日星期一

Guide de formation plus récente de MYSQL 1Z0-871 1Z0-873 006-002

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Code d'Examen: 1Z0-871
Nom d'Examen: MYSQL (MySQL 5.0 Developer Certified Professional Exam, Part I)
Questions et réponses: 69 Q&As

Code d'Examen: 1Z0-873
Nom d'Examen: MYSQL (MySQL 5.0 Database Administrator Certified Professional Exam, Part I)
Questions et réponses: 139 Q&As

Code d'Examen: 006-002
Nom d'Examen: MYSQL (Certified MySQL 5.0 DBA Part II)
Questions et réponses: 140 Q&As

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NO.1 Consider the following EXPLAIN output.
mysql> EXPLAIN SELECT Name FROM City WHERE Population > 8000000
*************************** 1. row ***************************
id: 1
select_type: SIMPLE
table: City
type: ALL
possible_keys: NULL
key: NULL
key_len: NULL
ref: NULL
rows: 4079
Extra: Using where
Which of the following statements are true?
A. The query cannot be optimized any better.
B. No index could be used to perform the query.
C. All 4079 rows of the table need to examined.
D. The Name column should be indexed.
E. The Population column should be indexed.
Answer: BCE

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NO.2 Is it possible to tell the MySQL server to throw an error on division-by-zero rather than converting it to
NULL and a warning?
A. No, it has to be done programmatically.
B. Yes, by updating a system variable.
C. Yes, there is a SQL mode that exists for that.
D. No, division-by-zero is always converted regardless of any setting.
Answer: C

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NO.3 In the following query, the Population column is indexed:
mysql> EXPLAIN SELECT Name
-> FROM Country
-> WHERE Code LIKE '%B%' AND Population > 10000
*************************** 1. row ***************************
id: 1
select_type: SIMPLE
table: Country
type: ALL
possible_keys: i_pop
key: NULL
key_len: NULL
ref: NULL
rows: 239
Extra: Using where
Which of the following best describes how to deal with the key value of the EXPLAIN output?
A. Use FORCE KEY
B. Use USE INDEX.
C. Use FORCE INDEX.
D. Use USE POSSIBLE_KEY
Answer: BC

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NO.4 Which of the following statements are true regarding the structure of grant tables in new distributions?
A. They change with every upgrade.
B. They are often changed.
C. They remain the same for backwards compatibility.
Answer: B

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NO.5 How can stored routines be used to check for constraints or legality of incoming data?
A. They can make use of the VALIDATE DEFINER setting.
B. They can not be used to check for constraints or legality of data.
C. They can check and only perform an action if the incoming values match a specified value.
Answer: C

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NO.6 Consider the following:
mysql> EXPLAIN SELECT Name FROM Country WHERE Code = 'CAN'
*************************** 1. row ***************************
id: 1
select_type: SIMPLE
table: Country
type: const
possible_keys: PRIMARY
key: PRIMARY
key_len: 3
ref: const
rows: 1
Extra:
Which of the following best describes the meaning of the value of the type column?
A. The table has exactly one row.
B. Several rows may be read from the table.
C. Only one row of all its rows need to be read.
Answer: C

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NO.7 Which of the following best describes what MASTER_LOG_FILE and MASTER_LOG_POS provides?
A. The path of the log file.
B. The file to log replication actions to.
C. The masters binary log name used for replication.
D. The position in the masters binary log in which to start replication.
Answer: CD

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NO.8 Can multi-column FULLTEXT indexes be used? If so, when?
A. No, they can not be used.
B. Yes, they should be used to search multiple columns simultaneously.
C. Yes, they can be used to search either one or all of the indexed columns.
Answer: B

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