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What is mean by ANALYZE command in oracle?

Last Modified: 2012-05-06
Wht is the purpose of ANALYZE command. if we ANALYZE the table/index wht happens to the object and how it improves the performance? Because why i am asking is, I have table which is contain fuction based index like UPPER(column_name). When i execute the below query, it is getting full table access.

select * from table_name where upper(column_name) = upper('ABC');

At the same time, when i analyze the table it is getting index based scan in the explain plan output.

One more thing is when i execute DBMS_STATS package also the table is getting full table access. See my execute command below.
EXEC DBMS_STATS.gather_index_stats('schema_name', 'index_name', estimate_percent => 30);

Can anyone share with me the solution of this? Thanks in advance.
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