Difference in num_rows and COUNT function.

Hi Experts,
SELECT COUNT(*) FROM APP.Big_table; Number of record--222653402This is a big table to get the it's taking 8 minutes time,
so that I tried the following SQL to get the count quickly.
SELECT num_rows FROM all_tables WHERE table_NAME='BIG_TABLE'
and owner='APP'; --Number of records 237213998But I got the different count for the two SQLs.
Why there is a difference in the count.
Which one is correct.
Please help me.
Thanks in advance.

Why there is a difference in the count.Because num_rows depends on how often table statistics are refreshed.
Read about DBMS_STATS package.
http://www.oracle-base.com/articles/misc/cost-based-optimizer-and-database-statistics.php
Which one is correct.The real-time count is the 'most correct' one (select count(*)).
But in the time it takes to count all records, possibility is that records have been inserted/deleted as well, depending on the use of the table, so you'll will have an 'approximate count', it does not always reflect the exact number of records.

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