How do you get explain plan for a procedure in Oracle?

  June 22, 2021
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How do you get explain plan for a procedure in Oracle?

Running EXPLAIN PLAN EXPLAIN PLAN FOR SELECT last_name FROM employees; This explains the plan into the PLAN_TABLE table. You can then select the execution plan from PLAN_TABLE . This is useful if you do not have any other plans in PLAN_TABLE , or if you only want to look at the last statement.

How do you get explain plan for a Sql_id in Oracle?

How to generate explain plan in oracle

  1. Explain plan for a sql_id from cursor. set lines 2000 set pagesize 2000 SELECT * FROM table(DBMS_XPLAN.
  2. Explain plan of a sql_id from AWR: SELECT * FROM table(DBMS_XPLAN.
  3. Explain plan of sql baseline:
  4. Explain plan for sql id from sql tuning set:

How do I get the explain plan in SQL Developer?

In SQL Developer, you don’t have to use EXPLAIN PLAN FOR statement. Press F10 or click the Explain Plan icon. It will be then displayed in the Explain Plan window.

Where are Oracle execution plans stored?

cursor cache
V$SQL_PLAN contains the execution plan for every statement stored in the cursor cache. Its definition is similar to the PLAN_TABLE . See “PLAN_TABLE Columns”.

What is the difference between explain plan and execution plan in Oracle?

An explain plan predicts how Oracle will process your query. An execution plan describes the steps it actually took.

What is cost in Explain plan in Oracle?

Cost is the estimated amount of work the plan will do. A higher cardinality => you’re going to fetch more rows => you’re going to do more work => the query will take longer. Thus the cost is (usually) higher. All other things being equal, a query with a higher cost will use more resources and thus take longer to run.

How do I create an AWR explain plan?

Get the execution plan for SQL query from AWR Report SID and SQL Plan Baseline in Oracle

  1. Check the Execution plan of SQLID from AWR Report. set lines 200 pages 200.
  2. Check the Execution plan from the SQL Baseline in Oracle. SELECT * FROM.
  3. Check the Execution plan from SQL Query.
  4. Check execution plan from SQL ID Cursor.

What is explain plan and execution plan in Oracle?

An explain plan predicts how Oracle will process your query. An execution plan describes the steps it actually took. Just as in the driving example above, Oracle may use a different route than the one it predicted.

How do you create a plan table?

EXPLAIN PLAN Ensure that the tables will be joined in optimal order. Determine the most restrictive indexes to fetch the rows. Determine the best internal join method to use (e.g. nested loops, hash join). Determine that the SQL is executing the steps in the optimal order.

What is the cost in Oracle explain plan?

Cost is the estimated amount of work the plan will do. A higher cardinality => you’re going to fetch more rows => you’re going to do more work => the query will take longer. The cost is useful for figuring out why the optimizer chose (e.g.) a full table scan over an index. But in most cases ignore it.

How do you create an execution plan?

Read more in The Importance Of Adopting Your Own Goal-Setting System

  1. Create a Strategic and Detailed Outline of Tasks. Make a strategic outline that details the goals, objectives and methods for the execution.
  2. Have Everyone Write a Narrative ‘Memo’ About the Project.
  3. Keep the Momentum Going With an Agile Structure.

What is cardinality in explain plan?

number of rows
Cardinality is the number of rows the optimizer guesses will be processed for a plan step. If the stats are old, missing, or incomplete – then this can be wildly wrong. You want to look for where the optimizer sees 5 rows (cardinality) but in reality there are 50,000 rows.