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1. Which of the following statements best describe the indexes supported by the MEMORY storage engine, and their general characteristics?

A) MEMORY tables only support BTREE which provide better performance with non-unique index values and other comparison operators.
B) MEMORY tables support HASH indexes which provide fast lookups that use a unique index, and BTREE indexes which provide better performance with non-unique index values and other comparison operators.
C) MEMORY tables only support HASH indexes which provide fast lookups that use a unique index.
D) MEMORY tables support HASH indexes which provide better performance with non-unique index values and other comparison operators, and BTREE indexes which provide fast lookups that use a unique index.

2. Which of the following optimizations could be made based on data collected in the slow query log? (Choose four)

A) Normalize data or add indexes to the tables that the queries use.
B) Make changes to the network infrastructure.
C) Change the storage engines in use.
D) Tune server parameters.
E) Rewrite queries to perform more efficiently.

3. The account 'ulf'@'localhost' has previously been created with the statement
GRANT ALL PRIVILEGES ON *.* TO 'ulf'@'localhost' IDENTIFIED BY 'w01f' This account should no longer be used, so you issue the following command:
REVOKE ALL PRIVILEGES ON *.* FROM 'ulf'@'localhost'
After executing this statement, you inspect the server and find that no clients are connected using that account. However, the next day you notice that the account 'ulf'@'localhost' is indeed connected to the server. Why is it still possible for the account 'ulf'@'localhost' to connect to the server?

A) The ON *.* clause should not be specified when disabling an account
B) Specifying GRANT ALL PRIVILEGES ON *.* effectively created an administrator account, which cannot be disabled through the REVOKE statement
C) The REVOKE command was not followed by a FLUSH PRIVILEGES command, so the account was never actually disabled
D) The REVOKE statement used does not remove the USAGE privilege from the account, allowing new connections with that account.

4. What type of resource limitations may be placed on a user account with the GRANT statement? (Choose four)

A) The maximum number of simultaneous connections an account can have
B) Resource limits can only be specified globally, not per-account
C) The number of queries per hour an account is allowed to issue
D) The number of times per hour that an account is allowed to connect to the server
E) MySQL does not have provisions for limiting resource usage
F) The number of updates per hour an account is allowed to issue

5. Which of the following best describes the purpose of the record buffer (as controlled through the read_buffer_size variable), and how it is set? (Choose two)

A) The record buffer is global and is only set by restarting the server.
B) The record buffer is set per connection.
C) The record buffer is used to perform sequential table scans, reducing the number of reads from disk
D) The record buffer is used for operations such as ORDER BY or GROUP BY.

問題與答案：