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For example: Statistics will be gathered on Q2 and the synopsis will be created so that the global-level statistics for SALES will be updated.Once the exchange has taken place, Q2 will need fresh statistics and a synopsis and it might also need extended statistics and histograms (if SALES has them).Most of you will be familiar with partition exchange load, but I’ll summarize it briefly to introduce you to the terminology I’ll be using here. Firstly, the LOAD table is filled with new data and then exchanged with a partition in the “live” application table (SALES).

However, bear in mind that this will ultimately mean that statistics for the new data will be gathered twice: once before the exchange (on the LOAD table) and once again after the exchange (for the Q2 partition when SALES statistics are re-gathered).The performance benefit is especially impessive if data is loaded at very high rates in parallel.The exact steps you need to execute for a partition exchange load will vary depending on the type of partitioning you use, whether there are local or global indexes on the table and what constraints are being used.It’s common to see it used in decision support systems and large operational data stores.Make sure you’ve taken a look at Part 1, or you are at least familiar with the concept of incremental statistics so that you know what a synopsis is in the context of a partitioned table.

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