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How much space is used to store validation status of buffered tables?


buffered tables are either fully, generic or single record buffered. If a fully buffered table is invalidated, the whole table is marked invalid in other application servers. It requires just one information: 'valid' or 'invalid'. This information is stored in the buffer of an application server corresponding to the table.

In opposite, for a single record buffered table, each invalidated entry must be marked. This requires more memory than for invalidated fully buffered tables.

For generic buffered table, information about invalid ranges is stored.

BUT, how much memory is used for invalidated tables regarding their buffering type. For sure, it depends on the number of invalidations. The number of invalidations can bee seen in ST10!

The more invalidations occur in single record buffered tables, the more overhead data for validation status must be stored in the buffer. This diminishes the available memory of the buffer..

Does anybody have an idea if this is right and how big the overhead for the different buffering type is>



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  • Posted on Dec 13, 2005 at 08:04 AM
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