Free Download 1z0-882 Examp Dump: Oracle.1z0-882.CertDumps.2015-10-31.100q.vcex

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Question 1

Which statement is true about the difference between HASH and BTREE INDEXES?

HASH indexes support rightmost prefixing of keys, which makes them faster than BTREE indexes in many causes.
HASH indexes can be used by the optimizer to speed up ORDER BY operations and not BTREE indexes.
HASH indexes are used only for equality comparisons (= or<=>),whereas BTREE indexes can also be used for range searches (>or<).
HASH indexes are much faster than BTREE indexes but can only be used for a single column.

Correct answer: C

Question 2

These there tables represent a many to-many relationship in asocial networking database:

This query draft is constructed to report for the past 30 days:

Which change will correct this query?

Correct answer: B

Question 3

Using the MYSQL command line client you have received the error "Lost connection to MYSQL server query"

Which three are possible causes of the error?

The MYSQL server stopped working during query execution.
The network connection was interrupted during query execution.
The connection that issued the query was killed.
The client connection stayed idle for longer than interactive timeout seconds and was closed.
The client sent an erroneous query to the server causing the connection to be closed.
The server interrupted client connection after max-connect-errors was achieved.