Craig James <craig_james@xxxxxxxxxxxxxx> writes:
> If I do:
> begin;
> update some_table set foo = newvalue where a_bunch_of_rows_are_changed;
> analyze some_table;
> rollback;
> does it roll back the statistics? (I think the answer is yes, but I need to be sure.)
Yes --- ANALYZE doesn't do anything magic, just a plain UPDATE of those
rows. (You could have easily tested this for yourself...)
regards, tom lane
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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match
