On Mon, Jul 10, 2017 at 4:08 PM, Greg Stark wrote:
> One thing I would like to see is features like this added to the
> opclasses (or opfamilies?) using standard PG functions that return
> standard PG data types. So if each opclass had a function that took
> the data type in question and returned
On 10 July 2017 at 19:40, Peter Geoghegan wrote:
> Key normalization means creating a representation for internal page
> items that we always just memcmp(), regardless of the details of the
> underlying datatypes.
One thing I would like to see is features like this added to the
opclasses (or opfa
On Mon, Jul 10, 2017 at 12:53 PM, Claudio Freire wrote:
> I do have a patch that attacks suffix truncation, heap tid unification
> and prefix compression all at once.
That's great! I'll certainly be able to review it.
> It's on a hiatus ATM, but, as you say, the implementations are highly
> corr
On Mon, Jul 10, 2017 at 1:23 PM, Alvaro Herrera
wrote:
> Claudio Freire wrote:
>
>> A missing optimization is that having tid unification allows VACUUM to
>> implement a different strategy when it needs to clean up only a tiny
>> fraction of the index. It can do the lookup by key-tid instead of
>>
Claudio Freire wrote:
> A missing optimization is that having tid unification allows VACUUM to
> implement a different strategy when it needs to clean up only a tiny
> fraction of the index. It can do the lookup by key-tid instead of
> scanning the whole index, which can be a win if the index is l
On Mon, Jul 10, 2017 at 3:40 PM, Peter Geoghegan wrote:
> It might appear excessive to talk about several different techniques
> in one place, but that seemed like the best way to me, because there
> are subtle dependencies. If most of the optimizations are pursued as a
> project all at once (say,
I've created a new Wiki page that describes a scheme for normalizing
internal page items within B-Tree indexes, and the many optimizations
that this can enable:
https://wiki.postgresql.org/wiki/Key_normalization
Key normalization means creating a representation for internal page
items that we alw
