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With the help of an example SQL query, explain the different steps that are carried out when cost...

With the help of an example SQL query, explain the different steps that are carried out when cost- based optimization is used by the optimization engine. Cleary state any assumption that you make.

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Answer #1

The cost based optimisation actually determines the best execution plan among the others by considering available access path and also by factoring the information available in terms of statistics done on the schema object that are being accessed by the SQL statements. The cost based optimisation is used to set a potential plan which can be based on the hints and the available path for the sql query. Moreover, the optimizer is effective in predicting the cost of each plan that are based on the statistics done from the data dictionary for data distribution and also on the storage characteristics of the table.

The cost based optimizer also helps the SQL statement for better performance of the query. By using the below line we can optimize the sql statement :

OPTIMIZER_MODE = FIRST_ROWS_10

this will help in the query for faster response.

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