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Re: [HACKERS] 6.4.x

From: Vadim Mikheev <vadim(at)krs(dot)ru>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-hackers(at)postgreSQL(dot)org
Subject: Re: [HACKERS] 6.4.x
Date: 1998-11-26 03:11:17
Message-ID: 365CC6D5.460B888A@krs.ru (view raw or flat)
Thread:
Lists: pgsql-hackers
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.

Vadim

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Next:From: Vadim MikheevDate: 1998-11-26 03:27:44
Subject: Re: [HACKERS] Re: [SQL] cursor and update + view
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