Home » Oracle » 1z0-066 » Which three statements are true about Global Sequences when connected to a physical standby database with Real-Time Query enabled?
Which three statements are true about Global Sequences when connected to a physical standby database with Real-Time Query enabled?
A. If the CACHE option is set then the size of the cache must be at least 100.
B. Their creation requires that a LOG_ARCHIVE_DEST_n parameter be defined in the standby that points back to their primary.
C. Their usage will always have a performance impact on the primary database.
D. Their usage may have a performance impact on the physical standby database if the CACHE size is too small
E. They must have the NOORDER and CACHE options set.
Correct Answer: BDE
Explanation/Reference:
B: the terminal standby should have a LOG_ARCHIVE_DEST_n parameter defined that points back to the primary.
D: Because the standby’s requests for a range of sequences involve a round-trip to the primary, be sure to specify a large enough value for the CACHE keyword when you create a sequence that will be used on an Oracle Active Data Guard standby. Otherwise, performance could suffer.
E: In an Oracle Active Data Guard environment, sequences created by the primary database with the default CACHE and NOORDER options can be accessed from standby databases as well.
References: https://docs.oracle.com/database/121/SBYDB/manage_ps.htm#SBYDB5164
|
Download Printable PDF. VALID exam to help you PASS.
|
 |
