lmkatag.blogg.se - Toad sql cost

Execute the statement and select the Explain Plan tab.

This plan does not execute the query.Īctual plan-Plan that was used to execute the SQL.

Estimated plan-Plan that is generated by executing the RDBS execution plan commands.

good to begin with as it shares the lowest overall cost with another option. Tip: If you occasionally closed the Results pane, you can restore it by selecting Editor | Windows | Script Results.įor SQL Server, the following explain plans are available: Getting Inside the Optimizer, plan Database, Oracle SQL, Oracle 10g, Toad. Toad automatically generates an estimated explain plan when you select the Explain Plan tab in the Results pane. You can use explain plans to help tune SQL to improve performance. If you are using cost-based optimization, this statement also determines the cost of executing the statement. The results of the plan display the order a database uses to search/join tables, the types of access used (indexed search or full table scan), and the names of indexes used.

The explain plan displays the steps a database uses to execute an SQL statement.

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