Does anybody have experience of running statistics or compression which they can share?
In my production Derby app, which has run 24x7 for over 4 years, I have a few tables which I need to compress, approximately every 6 months.
I have not found it necessary to update statistics on my tables. However, my tables are small and don't change very rapidly, which is I think the primary reason that I don't need to compress them or recompute their statistics very often. I think that if you have highly volatile tables, the need for compression and statistics is more substantial. I think you should set up a mechanism to monitor the performance of your most important transactions, and you should keep an eye on it, and you should also periodically run SYSCS_DIAG.SYSCS_SPACE_TABLE, etc., and keep an eye on those values, and, over time, you will probably develop an intuition about what level of performance degration justifies doing a statistics or compression pass. thanks, bryan
