Over time, log files collect millions of individual user actions. Furthermore, capturing a user's identity, location, and demographic profile are sensitive and complex challenges that affect Web site design and data warehouse design. But these tasks are among the most critical in managing customer relations, because once a system can identify its users, the data Webhouse can track their behavior. Straw from all over The decision to collect and store contact information about every visitor to a Web site introduces various daunting challenges related to the Internet's international expanse. In each case, the issue boils down to different locales having diverse ways of expressing the same thing.
Different cultures have their own languages, currencies, time zones, and address schemes.
Consider promotions that run out at midnight, hardware configurations aimed at peak load between 9 a.m. and 5 p.m., or advertising content that peddles nightclubs just before 5 p.m. and news portals right after 9 a.m. In reality, there are more than 500 time zones in the world, and the list is constantly changing. In the United States, for instance, observance of daylight savings time varies from state to state. Arizona does not observe daylight savings time at all. Not all countries are on an hourly zone boundary.