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Object documentation Converter Locate the document in its SAP Library structure

The converter is used for the assignment of logical to physical data pages. When data pages that are not located in the data cache are accessed, their logical position is first searched for in the converter. The converter then determines the corresponding physical position of the data pages in the data volumes.

The converter is a main memory structure that is shared simultaneously by all active users. Only the converter pages that contain a mapping of permanent data pages are written to the data volumes with each savepoint. In a restart, the pager can use these pages to restore the converter.

The converter is dimensioned dynamically, which means that you cannot set the size of the converter. The required converter pages are taken from the I/O buffer cache, which is used jointly by the converter and the data cache. The size of the I/O buffer cache is determined by the database parameter CACHE_SIZE.

If the converter requires more pages than were originally assigned, the number of data cache pages is reduced accordingly. If the converter requires fewer pages, the free pages are managed via the page pool, and can be used again by the converter if it grows.

 

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