Re: indexes on functions and create or replace function

On Thu, Aug 28, 2008 at 7:45 PM, Matthew Dennis <mdennis(at)merfer(dot)net> wrote:

> Another question though. Since I could potentially start transaction, drop
> indexes/checks, replace function, create indexes/checks, commit tranasaction
> could I deal with the case of the constant folding into the cached plan by
> flushing the entire cache in the same transaction? Is cache flushing
> transactional? The cases I have for this are infrequent in time and the
> overhead of reindexing things, rechecking checks/unique indexes already
> dwarf the performance lost to flushing the cache.
>
> On a related note, if I had a maintenence window where I can shutdown all
> DB access, make the referenced changes to the
> functions/indexes/caches/checks and restart PG - in your opinion, are there
> other likely problems to changing an immutable function under those
> circumstances, or should that be pretty safe? In other words, I have a
> function that has indexes on it that does the wrong thing - what do I do to
> replace it?
>

In the thread below, we kind of got side tracked on some other stuff and I
never got an answer to the questions above. Does anyone have any
insight/suggestions about the best way to replace a function that is used by
an index?

http://groups.google.com/group/pgsql.general/browse_thread/thread/92289ef0c2f5a109/8f96fb24bdd668e8