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I am connecting to same db from 2 different machines using SQL Developer and querying a table which stores timestamp. But to my surpise the time value returned by query has a gap of one hour on different machine. How is this possible as we are conencting to same DB? and whats the solution.

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Probably different timezone is configured on those machines. Check:

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As this answer suggests, Oracle's concept of time is influenced by the timezone setting of the client computer used to connect to the database. If you use select systimestamp from dual you should see that the times -- while in different timezones -- are actually the same. – Colin 't Hart Feb 20 '14 at 9:04

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