Database Tuning (MOSC)

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index to table access full

edited Nov 1, 2010 11:21PM in Database Tuning (MOSC) 7 commentsAnswered
 I am trying to figure out why a simple query like the one I am posting changes so drastically for cost.

select status_code from genesis.order_item_component where status_code from genesis.order_item_component where status_code <> '0500' '0500'

index full scan    cost: 2743

Add one column to this query

select status_code, last_action_date from genesis.order_item_component where  status_code <> '0500' table access full    cost:107250 Can someone explain why it changes? Thanks Al

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