The short text plan is useful when you want to compare plans quickly. It provides the least amount of information of all the plan formats, but it provides it on a single line.
In the following example, the plan starts with
Work[Sort because the ORDER BY clause causes the entire result set to be sorted. The Customers table is accessed by its primary key
index, CustomersKey. An index scan is used to satisfy the search condition because the column Customers.ID is a primary key.
The abbreviation JNL indicates that the optimizer chose a merge join to process the join between Customers and SalesOrders.
Finally, the SalesOrders table is accessed using the foreign key index FK_CustomerID_ID to find rows where CustomerID is less
than 100 in the Customers table.
SELECT EXPLANATION ('SELECT GivenName, Surname, OrderDate FROM Customers JOIN SalesOrders WHERE CustomerID < 100 ORDER BY OrderDate');
Work[ Sort[ Customers<CustomersKey> JNL SalesOrders<FK_CustomerID_ID> ] ]
Discuss this page in DocCommentXchange.
|Copyright © 2014, SAP AG or an SAP affiliate company. - SAP Sybase SQL Anywhere 16.0|