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Excerpt from A Self-Organizing Database System: A Different Approach to Query Optimization
There are clear instructions concerning how the system catalogs should be physically structured (they begin as heaps and should be hashed when their size becomes somewhat stable). Even so. Some users fail to hash them appropriately. Of course, the system continues to run: it just gets slower and slower. We have finally removed this particular decision from the user's domain (it is done automatically).
The sods should continuously monitor the queries. When it senses degradation in performance it should analyze the usage and. If the cost Of reorganization is Offset by performance improvement. It Should reorganize itself (or at least suggest that to the dba). The application programs can either be all recompiled at once. Or each program can be recompiled the first time it is used after the reorganization. We cannot resist the comparison of the all-knowing sods. Which always watches the user. With the Big Brother. Although intentions of the sods (we hope) are more benign.
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