SUN 310-090 310-811 examen pratique questions et réponses

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Code d'Examen: 310-090
Nom d'Examen: SUN (Sun Certified Business Component Developer for J2EE 1.3)
Questions et réponses: 409 Q&As

Code d'Examen: 310-811
Nom d'Examen: SUN (Sun Certified MySQL 5.0 Database Administrator Part II)
Questions et réponses: 138 Q&As

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NO.1 When working with stored routines, which of the following are true in regards to the effect on the
amount of data exchanged between client and server?
A. They may increase the amount of data exchanged.
B. They can help reduce the amount of data exchanged.
C. They have no effect on the amount of data exchanged.
Answer: B

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NO.2 What are reasons to prefer using GRANT and REVOKE statements over editing the privilege tables
directly?
A. Using GRANT and REVOKE allows the server to figure out the right tables and do all the appropriate
work
B. All grant tables in memory are immediately updated on GRANT and REVOKE
C. Making changes directly to the grant tables, one must remember to execute flush privileges to make
the
changes take effect
D. GRANT and REVOKE statements allow you to do more fine-grained tuning of user privileges than
does
editing the grant tables directly.
E. None of the above
Answer: BCD

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NO.3 Which of the following statements are true of how access control is based?
A. It is based off of an access control table in the mysql database.
B. It is based off of grant tables in the mysql database.
C. It is based off of an access control list stored in the data directory.
D. It is based off of an access control list stored inside the .frm files of each table.
Answer: B

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NO.4 Which of the following best describes how the relay log works?
A. It records the times when the slave connects to the master.
B. When a slave receives a change from the master, it is recorded in the relay log first and processed
later.
C. When a slave receives a change from the master, it is processed first and then recorded in the relay
log.
Answer: B

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NO.5 Given the following MyISAM table structure:
mysql> desc city;
+-------------+----------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-------------+----------+------+-----+---------+----------------+
| ID | int(11) | | PRI | NULL | auto_increment |
| Name | char(35) | | | | |
| CountryCode | char(3) | | | | |
| District | char(20) | | | | |
| Population | int(11) | | MUL | 0 | |
+-------------+----------+------+-----+---------+----------------+
and the following SQL statement:
SELECT Population
FROM city
WHERE Population = 10000
ORDER BY Population
LIMIT 5;
which of the following statements best describes how MySQL optimizer executes the query?
A. The optimizer uses the primary key column ID to read the index values, then uses the index on
Population to filter the results. The optimizer will always choose to use a unique index first, then use a
secondary index if available.
B. The optimizer uses the index on the Population column to search and filter the WHERE clause. A
temporary table is used to perform a filesort on the results, and then only 5 records are returned to the
client.
C. The optimizer uses the index on the Population column to search, filter and sort the Population column,
then returns 5 records to the client. The optimizer does not need to read the data rows, and can return
values from the index only, because the index contains just integer values that form a leftmost prefix for
the key.
D. The optimizer uses the index on the Population column to search, filter and sort the Population column,
and returns 5 records to the client. The optimizer does not need to read the data rows, and can return
values from the index only because only those columns where specified in the SELECT statement.
E. The optimizer will never read data from disk, since MySQL caches both data and index in the key
buffer.
Answer: D

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NO.6 How can the SHOW PROCESSLIST command be helpful when optimizing queries?
A. It shows if a query is using an index or not.
B. It shows how the server processes a query.
C. If checked periodically, it can reveal queries that cause other queries to hang.
D. It shows the percentage of processing power that each query is using on a server.
Answer: C

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NO.7 For which of the following objects can privileges be specified?
A. Host
B. Global
C. Database
D. Table
E. Column
F. Row
Answer: BCDE

SUN   310-811 examen   310-811

NO.8 Is the following statement true or false? The username you use to connect to MySQL must be the same
as the login used to access the operating system.
A. true
B. false
Answer: B

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