How to EXPLAIN your SQL query

How to EXPLAIN your SQL query

Hi,

Here is the code for EXPLAIN. This will help you in your analysis of performance regarding SQL you are going to run.

Consideration:
1) You should have all the objects (Referenced in your SQL) created in the same env where you will Explain the SQL.
2) You tables must be runstated before running Explain
3) You can replace host variables with any Char/Int Literals in the SQL statements.
4) Make sure your PLAN_TABLE and DSN_STATEMNT_TABLE present in the same Env.Here is one example of SQL code regarding How to Explain your query.
DELETE FROM PLAN_TABLE WHERE QUERYNO = 99999;
COMMIT;

EXPLAIN PLAN SET QUERYNO = 99999 FOR

SELECT B.STORE_NO, B.STOCK_ITEM, B.DELIVERY_DATE
FROM V1FOGH01 B

WHERE DELIVERY_DATE = (SELECT MAX(DELIVERY_DATE)
FROM V1FOGH01 A
WHERE A.STORE_NO = B.STORE_NO
AND A.STOCK_ITEM = B.STOCK_ITEM
AND A.QTY_TYPE ='7'
AND A.DELIVERY_DATE <= CURRENT DATE)
AND B.QTY_TYPE ='7';

SELECT * FROM PLAN_TABLE
WHERE QUERYNO = 99999
ORDER BY TIMESTAMP,QUERYNO,QBLOCKNO,PLANNO,MIXOPSEQ;

SELECT * FROM DSN_STATEMNT_TABLE
WHERE QUERYNO = 99999;
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