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From: Zdenek Kotala <[email protected]>
To: Robert Haas <[email protected]>
Cc: Jonah H. Harris <[email protected]>
Cc: Decibel! <[email protected]>
Cc: Tom Lane <[email protected]>
Cc: PostgreSQL-development <[email protected]>
Subject: Re: WIP: Page space reservation (pgupgrade)
Date: Mon, 10 Nov 2008 09:21:48 +0100
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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Robert Haas napsal(a):

> Let's suppose, for example, that in 8.5 we decide to change some type
> that is presently 16 bits to 32 bits, or 8 bits to 16 bits, etc.  This
> will make some tuples bigger, and potentially much bigger, but since
> it presumably won't be a commonly used data-type, most tuples won't
> change at all.  However, the worst case scenario for how much free
> space you might need to reserve will be very bad, and therefore a
> mechanism that allows reserving a fixed amount of free space per page
> won't be adequate.

The problem with datatypes is different story. It is should be easy to manage
this problem with keeping the old datatype definition for "old" tables and for 
new create new datatype with new OID. You can use ALTER TABLE for converting 
data from old type to the new one.

		Zdenek

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