Originally posted by arjun
When rebuilding a normal index, the statistics for that index are not affected.

SQL> create index x_test on test ( y ) global;

Index created.

SQL> analyze table test compute statistics;

Table analyzed.

SQL> select index_name, leaf_blocks from user_indexes;

INDEX_NAME LEAF_BLOCKS
------------------------------ -----------
X_TEST 3

SQL> alter index X_TEST rebuild;

Index altered.

SQL> select index_name, leaf_blocks from user_indexes;

INDEX_NAME LEAF_BLOCKS
------------------------------ -----------
X_TEST 3

Thus no change to the statistics when the index has been rebuilt.
When you rebuild them then you must know why you're rebuilding them.
You want them to stay "compact" as you planned or make them airy so the levels don't increase that fast...and then add pctfree in that clause............