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Oracle 1z0-888 Exam Practice Questions (P. 2)

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Question #6

What does the possible_keys column in this output denote?
  1. A
    if it is possible for you to include any indexes in your query
  2. B
    whether there are any indexes on the tables that you are querying
  3. C
    if there are any indexes that may be used to solve this query
  4. D
    whether you are using any indexes in your query

Correct Answer:
A

Question #7
Is it true that binary backups always take less space than text backups?
  1. A
    Yes, because binary backups only contain data, and not statements required to insert data into the tables.
  2. B
    No, because text backups can have optimizations, which make them smaller, such as updating many rows at once.
  3. C
    No, because if InnoDB tables contain many empty pages, they could take more space than the INSERT statements.
  4. D
    Yes, because even if InnoDB tables contain many empty pages, text backups have empty INSERT statements for them.

Correct Answer:
C

Question #8
You have a consistent InnoDB backup created with mysqldump, the largest table is 50 GB in size.
You start to restore your backup with this command;
shell> mysql –u root –p < backup.sql
After 30 minutes, you notice that the rate of restore seems to have slowed down. No other processes or external factors are affecting server performance.
Which is the most likely explanation for this slowdown?
  1. A
    The MySQL server has stopped inserting data to check index consistency.
  2. B
    InnoDB is doing CRC32 checks over the tablespace data as it grows.
  3. C
    The MySQL server is taking a periodical snapshot of data so it can resume the restore if it is interrupted mid-way.
  4. D
    InnoDB has filled the redo log and now must flush the pages.
  5. E
    Secondary indexes no longer fit into the buffer pool.

Correct Answer:
A

Question #9
Which two options describe how MySQL Server allocates memory? (Choose two.)
  1. A
    Each connection may have its own per-thread memory allocations.
  2. B
    Thread memory is pre-allocated up to thread_cache_size for performance.
  3. C
    Each thread allocates memory from a global pool.
  4. D
    Global memory resources are allocated at server startup.

Correct Answer:
AD

Question #10
Which three are key advantages of standard MySQL replication? (Choose three.)
  1. A
    supports native automatic failover
  2. B
    enables automatic resync of databases when discrepancies are detected
  3. C
    provides arbitrary geographic redundancy with minimal overhead to master
  4. D
    synchronously guarantees identical slave copy
  5. E
    is easy to configure and has low performance overhead
  6. F
    can easily add slaves for read scaling

Correct Answer:
B, E, F

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