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SAP recommend for workload generally the traditional 'POSIX timezone format', since in some (few) cases the Olson format has lead with SAP to significant performance-influence, which originated in the underlying lookup-mechanisms. 

The lookups do not necessarily impact performance; only with some specific kinds of workload (using time-related API extensively), and will likely be negligible in the majority of scenarios.

Note: The POSIX time zone format is the traditionally used format for AIX systems, while the usage of the Olson time zone format was initially introduced with AIX 6.1 in 2007.

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