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Typically, the exchange step looks like this: Operationally, this approach is more complex than inserting data directly into SALES but it offers some advantages.For example, new data can be inserted into LOAD before any indexes have been created on this table.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.For the purposes of this blog post I’m going to stick to how you manage statistics, but you can find details on how to deal with indexes and constraints in the Database VLDB and Partitioning Guide.Incremental statistics requires synopses to update the global-level statistics for SALES efficiently so a synopsis for Q2 will be created automatically when statistics on SALES are gathered.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.If you want to know more about extended statistics and column usage then check out this post.It covers how you can seed column usage to identify where there's a benefit in using extended statistics.

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).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).For example, if SALES has a column group, "(COL1, COL2)" then Q2 will need these statistics too.I'm also going to assume that the statistics on SALES are up-to-date prior to the partition exchange load.The moment after LOAD has been exchanged with Q2 there will be no synopsis on Q2; it won’t have been created yet.

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This technique is used when large volumes of data must be loaded and maximum performance is paramount.