Re: [HACKERS] 6.4.x

> Tom Lane wrote:
> >
> > >>>> (3) does 6.4 support query lengths > 8192, or data blocks > 8192
> > >>>> (other than large objects)?
> >
> > > Sometime in the past Darren K. worked to parameterize this limit.
> >
> > There has been some discussion of allowing tuples to span multiple
> > disk blocks, which would remove the problem entirely, but it hasn't
> > happened yet. Maybe for 6.5?
>
> Right now I'm rewriting HeapTuple structure and functions - for
> multi-version concurrency control (MVCC). New HeapTuple:
>
> typedef struct HeapTupleData
> {
> uint32 t_len; /* length of *t_data */
> ItemPointerData t_self; /* SelfItemPointer */
> HeapTupleHeader t_data; /* */
> ^^^^^^^^^^^^^^^^^^^^^^^^^^
> this is what known as HeapTuple in < 6.5
> } HeapTupleData;
>
> I assume that one, who would like implement blocks spanning,
> will add something to this new structure.
> I need in ~ one week, please wait.

Block spanning was only an idea. No idea how to code it. Yet.

--
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