Hi all,
I know how to generate the query plan but how to
interplate the query plan, really? The only thing I
know is if there is a FULL TABLE SCAN, that most
probably is bad, need to build an index. However, if
the query plan shows me something else, I don't know
what to improve.
For example, does the following look good??? (this is
just one example, please throw me any idad you can
think of. Thank you!)
Query Plan
-----------------------------------------------------------------------
SELECT STATEMENT cost=
NESTED LOOPS OUTER
NESTED LOOPS OUTER
NESTED LOOPS OUTER
NESTED LOOPS OUTER
TABLE ACCESS BY INDEX ROWID
CUSTOMER_ACCOUNT_CONTACTS
INDEX RANGE SCAN
CUSTOMER_ACCOUNT_CONTACTS_1
TABLE ACCESS BY INDEX ROWID PHONE
INDEX UNIQUE SCAN PK_PHONE
TABLE ACCESS BY INDEX ROWID PHONE
INDEX UNIQUE SCAN PK_PHONE
TABLE ACCESS BY INDEX ROWID PHONE
INDEX UNIQUE SCAN PK_PHONE
TABLE ACCESS BY INDEX ROWID PHONE
INDEX UNIQUE SCAN PK_PHONE
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