UPDATE STATISTICS
Imagine a table tab1 with a bazillion rows and five columns. There is one
index on the table, on column A.
If I do:
UPDATE STATISTICS LOW FOR TABLE tab1(col_a);
... it runs very quickly. But if I just do:
UPDATE STATISTICS LOW FOR TABLE tab1;
... it takes hours, maybe days. So what exactly does the latter command do,
that the former command does NOT do?