| From: | Greg Stark <stark(at)enterprisedb(dot)com> |
|---|---|
| To: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
| Cc: | Chris Mayfield <cmayfiel(at)cs(dot)purdue(dot)edu>, pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Pet Peeves? |
| Date: | 2009-02-04 02:39:18 |
| Message-ID: | 4136ffa0902031839u20d6d3c0o78d6137c7e6446fb@mail.gmail.com |
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| Lists: | pgsql-general |
On Tue, Feb 3, 2009 at 10:06 PM, Simon Riggs <simon(at)2ndquadrant(dot)com> wrote:
>
> On Tue, 2009-02-03 at 15:03 -0500, Chris Mayfield wrote:
>
>> 1. Having to rewrite entire tables out to disk the first time I scan
>> them, for example:
>>
>> CREATE TABLE t1 AS ...; -- writes 100 GB to disk
>> CREATE INDEX i1 ON t1 ...; -- rewrites 100 GB to disk
>>
>> The main issue is setting the hint bits for each tuple, which IMO should
>> initially be set for "CREATE TABLE AS" statements. To work around this
>> for now, I modified heap_insert (in heapam.c) to mark tuples as
>> committed when inserting them into newly added pages without WAL:
>
> I'll take this for 8.5.
This was proposed once already and some difficulties were identified.
Do you remember what they were?
--
greg
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