DO USING SQL DEVELOPER. SELECT PLAN_TABLE_OUTPUT FROM TABLE (DBMS_XPLAN.DISPLAY()); Or in SQL developer click Explain Plan (F10) icon on the toolbar. Example using EXPLAIN PLAN EXPLAIN PLAN FOR SELECT...

DO USING SQL DEVELOPER. SELECT PLAN_TABLE_OUTPUT FROM TABLE (DBMS_XPLAN.DISPLAY()); Or in SQL developer click Explain Plan (F10) icon on the toolbar. Example using EXPLAIN PLAN EXPLAIN PLAN FOR SELECT COUNT(*) FROM oe.customers c; SELECT PLAN_TABLE_OUTPUT FROM TABLE (DBMS_XPLAN.DISPLAY()); The result The result shows that full scan of CUSTOMERS_PK was used. It took 1 sec. Example using SQL Developer Explain Plan There results are the same, but presented differently. SQL Developer Explain Plan all so allows to compare two execution palns. Find all indexes for OE.CUSTOMERS table SELECT * from DBA_IND_COLUMNS WHERE TABLE_OWNER='OE' and TABLE_NAME='CUSTOMERS'; Compare different queries using EXPLAIN PLAN 1.Study the structure of SH.CUSTOMERS table. This table is part of the same sample schema as OE.CUSTOMERS What query did you use? Provide code of the query and screenshot of the results. 2.Find all indexes on SH.CUSTOMERS table. You might need to use several data dictionary views to find all information required. Provide code of all queries and screenshots of the results. Index name Column Name Index Type https://docs.oracle.com/cd/E11882_01/server.112/e40540/indexiot.htm#CNCPT1170 3.Find how many rows in SH.CUSTOMERS table have information about customers whose last name contains "ltz". What query did you use? Provide code of the query and screenshot of the results. 4.Find an execution plan for the previous query. Pin the execution plan. Provide a screenshot and an explanation of the observed results. 5.Add index to SH.CUSTOMERS table. The index should combine customers' first name and last name. What query did you use? Provide code of the query and screenshot of the results. 6.Find how many rows in SH.CUSTOMERS table have information about customers whose last name contains "ltz". What query did you use? Provide code of the query and screenshot of the results. 7.Find an execution plan for the previous query. Provide a screenshot and an explanation of the observed results. 8.Compare execution plans for both queries (before and after the index). Provide a screenshot and an explanation of observed results.