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Background documentation Performance Requirements Locate the document in its SAP Library structure

Note the following points for your database instance:

·        For performance reasons, create data volumes and log volumes on different disks. Since all data changes are logged in the log volumes, these are the areas of your database instance with the most activity.

·        Even when you use RAID-5 systems, configure the database instance with multiple data volumes. Performance will be better with multiple data volumes than with a single volume, because some parallel mechanisms used by the database system depend on the number of configured data volumes.

·        For performance reasons, the log volumes must not be created on RAID-5 systems but only on dedicated disks or RAID-1 systems.

·        If swap or paging areas and log entries are kept on the same disk, performance will be negatively affected.

·        On UNIX systems, you should use raw devices for the data volumes and log volumes, because accessing data in raw devices is generally quicker than accessing data in files.

 

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