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These plans describe the way to open the tables and indexes, search and locate the rows of interest, and do any data manipulation as requested in the SQL batch.
For instance a query plan will describe an access path like .
Other factors considered are the CPU consumption and the memory required for each plan alternative.
Using formulas tuned over many years of experience all these factors are synthesized into a single cost value for each alternative and then the alternative with the lowest cost is chosen as the query plan to be used.
For example if the request is a SQL Batch type request the task will represent the entire batch, not individual statements.