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Global trace information is used to service DB2. Global trace records information regarding entries and exits from internal DB2 modules as well as other information about DB2 internals. It is not accessible through tools that monitor DB2 performance. Most sites will never need to use the DB2 global trace. You should avoid it unless an IBM representative requests that your shop initiate it.

Estimated overhead: IBM states that the global trace can add 100 percent CPU overhead to your DB2 subsystem.