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Oracle 1Z0-888 - Questions & Answers

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Question 1
Single choice

You have just executed a manual backup by using this command:

mysqlbackup -u root -p --socket=/tmp/my.sock --backup-dir=/my/backup/ backup

The operation completed without error.

What is the state of this backup and operation required before it is ready to be restored?

A.

Backup State = Compressed Backup
Operation = copy-back

B.

Backup State = Raw Backup
Operation = apply-log

C.

Backup State = Prepared Backup
Operation = validate

D.

Backup State = Prepared Backup
Operation = apply-log

E.

Backup State = Raw Backup
Operation = backupdir-to-image

Question 2
Single choice

Which MySQL utility program should you use to process and sort the Slow Query Log based on query time or average query time?

A.

mysqldumpslow

B.

mysqldump

C.

mysqlaccess

D.

mysqlshow

E.

mysqlslow

Question 3
Single choice

Consider:

Which statement best describes the meaning of the value for the key_len column?

A.

It shows how many bytes will be used from each index row.

B.

It shows the number of characters indexed in the key.

C.

It shows the total size of the index row.

D.

It shows how many columns in the index are examined.

Question 4
Single choice

Examine the mydata table and SELECT statements:

You issue:

mysql> begin;
mysql> update mydata set a=0 where b=3;

How many rows are now protected by locks with the default InnoDB configuration?

A.

one

B.

one row and a next-key lock for supremum

C.

one row and a gap-lock

D.

five

Question 5
Single choice

A particular government's security policy is to have very strict data encryption and safety settings. This is done by restricting access based on their own CA authority and limiting access to particular users within a department.

Which method could be used to restrict access as required?

A.

using GRANT ... REQUIRE X509 AND REQUIRE ISSUER `/C=.....' AND REQUIRE SUBJECT `/C=.....'

B.

using GRANT USAGE, X509, .......ON *.* TO user@remotehost IDENTIFIED BY `secret_password'

C.

using GRANT ... REQUIRE SSL for a secure connection

D.

using GRANT USAGE, SSL, .....ON *.* TO user@remotehost IDENTIFIED BY `secret_password'

Question 6
Single choice

What does the possible_keys column in this output denote?

A.

if it is possible for you to include any indexes in your query

B.

whether there are any indexes on the tables that you are querying

C.

if there are any indexes that may be used to solve this query

D.

whether you are using any indexes in your query

Question 7
Single choice

Is it true that binary backups always take less space than text backups?

A.

Yes, because binary backups only contain data, and not statements required to insert data into the tables.

B.

No, because text backups can have optimizations, which make them smaller, such as updating many rows at once.

C.

No, because if InnoDB tables contain many empty pages, they could take more space than the INSERT statements.

D.

Yes, because even if InnoDB tables contain many empty pages, text backups have empty INSERT statements for them.

Question 8
Single choice

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?

A.

The MySQL server has stopped inserting data to check index consistency.

B.

InnoDB is doing CRC32 checks over the tablespace data as it grows.

C.

The MySQL server is taking a periodical snapshot of data so it can resume the restore if it is interrupted

mid-way.

D.

InnoDB has filled the redo log and now must flush the pages.

E.

Secondary indexes no longer fit into the buffer pool.

Question 9
Multiple choice

Which two options describe how MySQL Server allocates memory? (Choose two.)

A.

Each connection may have its own per-thread memory allocations.

B.

Thread memory is pre-allocated up to thread_cache_size for performance.

C.

Each thread allocates memory from a global pool.

D.

Global memory resources are allocated at server startup.

Question 10
Multiple choice

Which three are key advantages of standard MySQL replication? (Choose three.)

A.

supports native automatic failover

B.

enables automatic resync of databases when discrepancies are detected

C.

provides arbitrary geographic redundancy with minimal overhead to master

D.

synchronously guarantees identical slave copy

E.

is easy to configure and has low performance overhead

F.

can easily add slaves for read scaling

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