Cost Vs Timing

Hi all,
I want to know what should be given more importance in the performance of a query.
Cost or the Execution time.
I have two queries which return the same rows.
Their statistics are:
Cost ---------------------------------------------------------- Execution Time
1. 84 --------------------------------------------------------- ' 00:00:03.95'
2. 8591 ---------------------------------------------------------- ' 00:00:01.45'
If i were to tell which is the best amongst the two which should i pick?
And also what does cost signify?
Thanks,
Anand

Cost is a metric used by the optimizer to choose the most efficient execution plan for a given query, so it is a measure of efficiency as calculated by the optimizer based on statistics available. It is in theory linked with execution time, but in practice one isn't a reliable indication of the other. For example, consider the "first_rows_n" type of requirement where you want the first page of results quickly despite the overall cost being higher. It is also possible that the stats are not correct, or of course the CBO's formula itself could be missing something (particularly likely when dealing with second-order cardinalities as a result of conditional joins - how many distinct values of z will it have after joining x and y with a filtering condition and an EXISTS subquery?)
Typically end users care more about elapsed time than internal costing metrics.

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