Re: [HACKERS] Error "vacuum pg_proc"

> I spent some more time looking into this, and found out that actually
> the safe upper limit for btree index entries is not ~ BLCKSZ/2, but
> ~ BLCKSZ/3. btree needs to be able to insert two items on every page,
> but it *also* keeps an extra item (the "high key") on non-rightmost
> pages. So if any item exceeds one-third the available space, you run
> a risk of failure depending on what page it ends up on and what else
> is on that same page.
>
> It turns out that for an index on a single text column, the maximum
> safe text length is 2700 bytes. So the correct check for dangerous
> procedure definitions in 6.5.* is

This is another argument to try and get long tuples into 7.0.

--
Bruce Momjian | http://www.op.net/~candle
maillist(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
+ Christ can be your backup. | Drexel Hill, Pennsylvania 19026