1z0-071 Exam Dumps | Examine these statements which execute successfully: ALTER SESSION SET NLS_DATE

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Question 108/139

Examine these statements which execute successfully:
ALTER SESSION SET NLS_DATE_FORMAT = 'DD-MON-YYYY HH24 MI: SS'
ALTER SESSION SET TIME_ ZONE = '-5:00';
SELECT DBTIMEZONE, SYSDATE FROM DUAL
Examine the result:

If LOCALTIMESTAMP was selected at the same time what would it return?

A. 11-JUL-2019 6,00,00,00000000 AM - 05:00

B. 11-JUL-2019 11,00,00,00000000 AM

C. 11-JUL-2019 6,00,00,000000 AM

D. 11-JUL-2019 11,00,00,000000AM -05:00

Correct Answer: A

The LOCALTIMESTAMP function in Oracle Database returns the current date and time in the session time zone. Given that the session time zone was set to -5:00 with the ALTER SESSION SET TIME_ZONE command, LOCALTIMESTAMP will return the date and time adjusted to this session time zone.
The SYSDATE function, on the other hand, returns the current date and time from the operating system of the database server, which is not affected by the session time zone setting. In the result shown, SYSDATE returns
11-JUL-2019 11:00:00, which reflects the system time zone, not the session time zone.
The time difference between the DBTIMEZONE (+00:00) and the session time zone (-5:00) is 5 hours. Since SYSDATE shows the time as 11:00:00 in the system time zone, the LOCALTIMESTAMP adjusted to the session time zone would show the time as 06:00:00.
The correct answer is A: 11-JUL-2019 6:00:00.00000000 AM - 05:00. This represents the local timestamp in the session time zone, which is 5 hours behind the DBTIMEZONE.
Please note that the exact format returned by LOCALTIMESTAMP includes the fractional seconds up to 9 decimal places, and the time zone offset is specified as part of the timestamp.

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