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QUESTION NO:18

Which of the following statements are true regarding the data directory on a Windows binary installation?

A. A script needs to be run to initialize it after installation.

B. It comes pre-initialized.

C. You can choose to pre-initialize it or initialize it manually during the installation.

Correct Answer: B

Explanation

Explanation/Reference:

Explanation:

24.2.1. Server Startup Prerequisites on Windows

For MySQL installations on Windows, the data directory is preconfigured and ready to use.

QUESTION NO:75

When working with InnoDB, which of the following are true of a parent / child foreign key relationship?

A. The parent and child can have separate data types.

B. The parent and child must have the same data type.

C. The parent and child may sometimes need the same data type, but not always.

Correct Answer: B

Explanation

Explanation/Reference:

Explanation:

29.4.6. Using Foreign Keys

In a foreign key relationship, the referring column and the referenced column should have the same data

type, and both must be indexed. (If the referring column has no index, InnoDB creates an index on it

automatically.)

QUESTION NO:59

Which of the following statements are true?

A. InnoDB tables will be automatically recovered after a crash.

B. MyISAM tables will be automatically recovered after a crash.

C. InnoDB tables will be recovered after a crash if the innodb-recover option is configured.

D. MyISAM tables will be recovered after a crash if the myisam-recover option is configured.

E. InnoDB tables cannot be recovered after a crash, you have to restore data from backup.

F. MyISAM tables cannot be recovered after a crash, you have to restore data from backup.

Correct Answer: AD

Explanation

Explanation/Reference:

Explanation:

A: InnoDB’s internal recovery mechanism is pretty good. If the database crashes, InnoDB will attempt to fix

everything by running the log file from the last timestamp. In most cases it will succeed and the entire

process is transparent.

D: Automatic recovery is activated if you start mysqld with the –myisam-recover option. In this case, when

the server opens a MyISAM table, it checks whether the table is marked as crashed or whether the open

count variable for the table is not 0 and you are running the server with external locking disabled. If either

of these conditions is true, the following happens:

The server checks the table for errors.

If the server finds an error, it tries to do a fast table repair (with sorting and without re-creating the data

file).

If the repair fails because of an error in the data file (for example, a duplicate-key error), the server tries

again, this time re-creating the data file.

If the repair still fails, the server tries once more with the old repair option method (write row by row without

sorting). This method should be able to repair any type of error and has low disk space requirements.

References:

QUESTION NO:62

Which of the following happens when BEGIN TRANSACTION or START TRANSACTION command is

issued?

A. Autocommit mode overrides BEGIN TRANSACTION and START TRANSACTION.

B. Autocommit mode is suspended and has to be re-enabled explicitly.

C. Autocommit mode is suspended until COMMIT.

D. Nothing happens as they are not valid commands.

Correct Answer: C

Explanation

Explanation/Reference:

Explanation:

29.4.3. The InnoDB Transaction Model

The second method is to suspend the current autocommit mode by beginning a transaction explicitly.

Any of the following statements begins a transaction:

START TRANSACTION;

BEGIN;

BEGIN WORK;

QUESTION NO:5

Which of the following is true for the command-line programs mysqlcheck and myisamchk?

A. mysqlcheck must run on the server to perform checks and repairs and myisamchk can perform checks

and repairs on a remote server.

B. mysqlcheck can perform checks and repairs on a remote server, and myisamchk must run on the

server.

C. Both mysqlcheck and myisamchk can perform checks and repairs on a remote server.

D. Neither mysqlcheck or myisamchk can perform checks and repairs on a remote server.

Correct Answer: B

Explanation

Explanation/Reference:

Explanation:

30.3.

The myisamchk utility for MyISAM tables also performs table maintenance. However, it takes a different

approach from MySQL Administrator and mysqlcheck. Rather than sending SQL statements to the server,

myisamchk directly reads and modified the table files. For this reason, it’s necessary when using

myisamchk to ensure that the server does not access the tables at the same time.

QUESTION NO:63

Which of the following statements are true with regard to savepoints in transactions?

A. Within a transaction, you can define multiple savepoints

B. All savepoints must have unique identifiers

C. You can rollback to any previous savepoint.

D. You can rollback to only the latest savepoint.

E. If you rollback to a previous savepoint, all statements after this savepoint are rolled back and cannot be

reissued.

F. If you rollback to a previous savepoint, you still can replay the statements after this savepoint.

Correct Answer: ABCE

Explanation

Explanation/Reference:

Explanation:

29.4.3. The InnoDB Transaction Model

If you want to roll back only part of a transaction, you can set a savepoint by using the SAVEPOINT

statement:

SAVEPOINT savepoint_name;

Multiple savepoints can be set within a transaction.

The SAVEPOINT statement sets a named transaction savepoint with a name of identifier. If the current

transaction has a savepoint with the same name, the old savepoint is deleted and a new one is set.

The ROLLBACK TO SAVEPOINT statement rolls back a transaction to the named savepoint without

terminating the transaction.

Modifications that the current transaction made to rows after the savepoint was set are undone in the

rollback, but InnoDB does not release the row locks that were stored in memory after the savepoint.

http://dev.mysql.com/doc/refman/5.0/en/savepoint.html

QUESTION NO:28

Suppose you have a column in which most records are going to be between 30 and 32 characters. Which

of the following column types would be most efficient?

A. VARCHAR

B. CHAR

C. TEXT

D. Either VARCHAR or CHAR

Correct Answer: B

Explanation

Explanation/Reference:

Explanation:

27.2. Choosing Data Types for Character Columns

If stored string values all have the same length, use a fixed-length type rather than a variable-length type.

To store values that are always 32 characters long, CHAR(32) requires 32 characters each, whereas

VARCHAR

(32) requires 32 characters each, plus an extra byte to store the length. In this case, VARCHAR requires

one byte more per value than CHAR.

QUESTION NO:56

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

A. It uses table-level locking.

B. It uses row-level locking.

C. Underlying MyISAM tables are read-locked when you issue a SELECT statement on a MERGE table.

D. Underlying MyISAM tables are write-locked when you issue a SELECT statement on a MERGE table.

E. Underlying MyISAM tables are read-locked when you issue a statement that modifies a MERGE table.

F. Underlying MyISAM tables are write-locked when you issue a statement that modifies a MERGE table.

G. To LOCK a MERGE table, it is sufficient to lock just that table.

H. To LOCK a MERGE table, you need to lock all underlying MyISAM tables as well.

Correct Answer: ACFG

Explanation

Explanation/Reference:

Explanation:

29.3.1. MERGE Locking Characteristics

The MERGE storage engine uses table-level locking. However, because a MERGE table is defined in

terms of other tables, MERGE locking involves locks on those tables as well:

When the MERGE engine acquires a lock for a MERGE table, it acquires a lock for all the underlying

MyISAM tables. Thus, all the tables are locked together. The underlying MyISAM tables are read-locked

when you issue a SELECT statement for a MERGE table.

The underlying MyISAM tables are write-locked when you issue a statement that modifies a MERGE table,

such as INSERT or DELETE.

To explicitly lock a MERGE table with LOCK TABLES, it is sufficient to lock just that table. You need not

lock the underlying MyISAM tables as well.

QUESTION NO:2

Another user has issued LOCK TABLES pets READ You can…

A. Update table pets

B. SELECT from table pets

C. UPDATE and SELECT from table pets

D. None of the above

Correct Answer: B

Explanation

Explanation/Reference:

QUESTION NO:24

What will the following statement do in a Windows environment? Assume that there are no conflicts in the

pathname definitions.

C:> mysqld –install MySQL50 –defaults-file=C:my-opts.cnf

A. MySQL 5.0 will be installed using default configuration file C:my-opts.cnf.

B. MySQL will be installed as Windows service name MySQL50 and will use C:my-opts.cnf as

configuration file.

C. An error message will be issued as –install is not a valid option for mysqld.

Correct Answer: B

Explanation

Explanation/Reference:

Explanation:

24.2.

shell> mysqld –install my_service

shell> mysqld –install my_service –defaults-file=C:server-opts shell> mysqld –remove my_service

shell> net start my_service shell> net stop my_service

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