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22-Sep-2020 08:11

This is easy to do because any statistics gathered on LOAD will be associated with Q2 after the exchange.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 data in LOAD is published to SALES “at the flick of a switch”.Typically, the exchange step looks like this: Operationally, this approach is more complex than inserting data directly into SALES but it offers some advantages.This means that a synopsis will be ready to be used as soon as the exchange has taken place without requiring statistics to be gathered on Q2 post-exchange.The result of this is that the global-level statistics for SALES can be refreshed faster in Oracle Database 12c than they can be in Oracle Database 11g.The effect of the exchange is to incorporate all of the data in LOAD into SALES by swapping the “identity” of LOAD with Q2.The exchange is a logical operation: a change is made in the Oracle data dictionary and no data is moved.

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.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.When new data is loaded into a table, optimizer statistics must be updated to take this new data into account.This happens even if you don't choose to seed column usage.

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Oracle Database 12c includes an enhancement that allows you to create a synopsis on LOAD prior to the exchange.In the example above, the global-level statistics for SALES must be refreshed to reflect the data incorporated into the table when LOAD is exchanged with Q2.

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