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MYSQL 1Z0-873 Exam Syllabus Topics:

MYSQL MySQL 5.0 Database Administrator Certified Professional Exam, Part I Sample Questions:

1. Which of the following statements are true for the MERGE storage engine?

A) Underlying MyISAM tables are write-locked when you issue a statement that modifies a MERGE table.
B) To LOCK a MERGE table, you need to lock all underlying MyISAM tables as well.
C) It uses row-level locking.
D) Underlying MyISAM tables are write-locked when you issue a SELECT statement on a MERGE table.
E) It uses table-level locking.
F) Underlying MyISAM tables are read-locked when you issue a SELECT statement on a MERGE table.
G) Underlying MyISAM tables are read-locked when you issue a statement that modifies a MERGE table.
H) To LOCK a MERGE table, it is sufficient to lock just that table.

2. You are using a multi-byte character set with variable-length encoding. You need to store records whose values are always 20 characters. Which of the following column types would be the most efficient to use in terms of storage space?

A) CHAR
B) VARCHAR
C) The storage requirements for CHAR or VARCHAR would be the same

3. Which of the following correctly defines dirty reads, non-repeatable reads and phantom row?

A) A dirty read is a read by one transaction of uncommitted changes made by another transaction.
B) A phantom is a row that appears where it was not visible before.
C) A dirty read is a read by one transaction of its uncommitted changes.
D) A non-repeatable read occurs when a transaction performs the same retrieval twice but gets a differentresult each time.
E) A phantom is a read by one transaction of uncommitted changes made by another transaction.
F) A non-repeatable read is a row that appears where it was not visible before.

4. Which of the following happens when BEGIN TRANSACTION or START TRANSACTION command is issued?

A) Autocommit mode is suspended until COMMIT.
B) Autocommit mode overrides BEGIN TRANSACTION and START TRANSACTION.
C) Nothing happens as they are not valid commands.
D) Autocommit mode is suspended and has to be re-enabled explicitly.

5. Which of the following are some trade-offs between binary and text backups?

A) Binary backups may not be portable across different architectures.
B) Text backups are portable across different architectures.
C) Binary backups are slower while text backups are faster.
D) Binary backups are faster while text backups are slower.

Solutions: