1Z0-874 Exam Questions & Answers

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1Z0-874 Exam Questions & Answers

Vendor: Oracle

Certifications: Others Oracle Certifications

Exam Code: 1Z0-874

Exam Name: MySQL 5.0 Database Administrator Certified Professional Exam, Part II


Q&As: 138

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1Z0-874 Online Practice Questions and Answers

Questions 1

mysql> EXPLAIN SELECT * FROM City WHERE CountryCode = 'USA'\G *************************** 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 What does it mean that the possible_keys column value is NULL?

A. No index is considered available for this query.

B. No index exists for the table you are querying.

C. You are not making use of any available indexes in your query.

Show Answer
Questions 2

Consider the following:

mysql> SHOW STATUS LIKE 'Qcache%';


| Variable_name | Value |


| Qcache_free_blocks | 87 |

| Qcache_free_memory | 318442 |

| Qcache_hits | 11224 |

| Qcache_inserts | 19215 |

| Qcache_lowmem_prunes | 437 |

| Qcache_not_cached | 9155 |

| Qcache_queries_in_cache | 240 |

| Qcache_total_blocks | 924 |


What can be derived from this output?

A. There is a low utilization of the query cache.

B. There is a normal utilization of the query cache.

C. There is a high utilization of the query cache.

Show Answer
Questions 3

Which of the following best describes what the connection backlog is and why it may need to be increased?

A. It may need to be increased on a server with a high rate of transactions.

B. The backlog is the queue of processes waiting to be processed on a server.

C. The backlog is the queue of network connections of clients waiting to connect.

D. It may need to be increased on a server with a high rate of client connections.

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