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Background documentation I/O Buffer Cache  Locate the document in its SAP Library structure

The entire main memory that is available for I/O operations is managed in the I/O buffer cache.

When the database instance is started, the I/O buffer is generated in the main memory in accordance with the size given in the general database parameter CACHE_SIZE.

The converter and the data cache are the most important main memory consumers that are managed in the I/O buffer cache. If the converter grows while the database is running, and requires more pages, then extra pages are assigned to it from the I/O buffer cache. If no more pages are available there, data is displaced from the data cache and made available to the converter.

See also:

Concepts of the Database System, General Database Parameters

 

 

 

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