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Background documentation Tips for Creating a Database Instance Locate the document in its SAP Library structure

To achieve good I/O performance when working with the database instance, use the following tips when you create and configure a new database instance.

·        If you are operating several database instances, then create each database instance on a separate computer.

·        Use different disks for data volumes and for log volumes. As all data changes are logged in the log volumes, the log volumes are those areas of the database instance which have the highest write activity.

·        For swap and paging areas, use other disks than for the log volumes.

·        Even if you are using RAID-5 systems, create several data volumes for the database instance. Since some of the parallelization techniques of the database system depend on the number of data volumes, you can improve performance if you use several data volumes instead of one data volume.

·        If you are using several disks for the volumes, use disks with consistent performance profiles (in particular consistent access speeds). This is the only way to ensure that the disks will be filled evenly.

·        Do not create log volumes on RAID-5 systems, only on dedicated disks or on RAID-1 systems.

·        On UNIX systems, use raw devices for data and log volumes. Accessing data in raw devices is generally faster than accessing data in files.

 

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