Author: depesz

Waiting for 9.6 – Allow usage of huge maintenance_work_mem for GIN build.

On 2nd of September, Teodor Sigaev committed patch:

Allow usage of huge maintenance_work_mem for GIN build.
 
Currently, in-memory posting list during GIN build process is limited 1GB
because of using repalloc. The patch replaces call of repalloc to repalloc_huge.
It increases limit of posting list from 180 millions
(1GB / sizeof(ItemPointerData)) to 4 billions limited by maxcount/count fields
in GinEntryAccumulator and subsequent calls. Check added.
 
Also, fix accounting of allocatedMemory during build to prevent integer
overflow with maintenance_work_mem > 4GB.
 
Robert Abraham <robert.abraham86@googlemail.com> with additions by me

Continue reading Waiting for 9.6 – Allow usage of huge maintenance_work_mem for GIN build.

Waiting for 9.6 – Add IF NOT EXISTS processing to ALTER TABLE ADD COLUMN

On 30th of July, Andrew Dunstan committed patch:

Add IF NOT EXISTS processing to ALTER TABLE ADD COLUMN
 
Fabrízio de Royes Mello, reviewed by Payal Singh, Alvaro Herrera and
Michael Paquier.

Continue reading Waiting for 9.6 – Add IF NOT EXISTS processing to ALTER TABLE ADD COLUMN

Waiting for 9.6 – Add new function pg_notification_queue_usage.

On 17th of July, Robert Haas committed patch:

Add new function pg_notification_queue_usage.
 
This tells you what fraction of NOTIFY's queue is currently filled.
 
Brendan Jurd, reviewed by Merlin Moncure and Gurjeet Singh.  A few
further tweaks by me.

Continue reading Waiting for 9.6 – Add new function pg_notification_queue_usage.

Waiting for 9.6 – Add psql PROMPT variable showing the pid of the connected to backend.

On 7th of July, Andres Freund committed patch:

Add psql PROMPT variable showing the pid of the connected to backend.
 
The substitution for the pid is %p.
 
Author: Julien Rouhaud
Discussion: <a href="http://git.postgresql.org/gitweb/?p=postgresql.git;a=object;h=116262CF971C844FB6E793F8809B51C6E99D48">116262CF971C844FB6E793F8809B51C6E99D48</a>@BPXM02GP.gisp.nec.co.jp

Continue reading Waiting for 9.6 – Add psql PROMPT variable showing the pid of the connected to backend.

Waiting for 9.6 – Add psql \ev and \sv commands for editing and showing view definitions.

On 3rd of July, Tom Lane committed patch:

Add psql \ev and \sv commands for editing and showing view definitions.
 
These are basically just like the \ef and \sf commands for functions.
 
Petr Korobeinikov, reviewed by Jeevan Chalke, some changes by me

Continue reading Waiting for 9.6 – Add psql \ev and \sv commands for editing and showing view definitions.

Partitioning – what? why? how?

Recently I noticed that more and more cases that I deal with could use some partitioning. And while theoretically most people know about it, it's definitely not a very well-understood feature, and sometimes people are scared of it.

So, I'll try to explain, to my best knowledge, what it is, why one would want to use it, and how to actually make it happen.

Continue reading Partitioning – what? why? how?

Filling in the blanks

Some time ago someone on irc asked interesting question. One that I couldn't answer then (didn't have an immediate idea, and didn't have time to spend on looking into it).

Now, I have some more time, and despite the fact that the person that had this problem no longer cares about it (he found some solution himself if I recall correctly), decided to look into it.

Continue reading Filling in the blanks

Waiting for 9.5 – Rename jsonb_replace to jsonb_set and allow it to add new values

On 1st of June, Andrew Dunstan committed patch:

Rename jsonb_replace to jsonb_set and allow it to add new values
 
The function is given a fourth parameter, which defaults to true. When
this parameter is true, if the last element of the path is missing
in the original json, jsonb_set creates it in the result and assigns it
the new value. If it is false then the function does nothing unless all
elements of the path are present, including the last.
 
Based on some original code from Dmitry Dolgov, heavily modified by me.
 
Catalog version bumped.

Continue reading Waiting for 9.5 – Rename jsonb_replace to jsonb_set and allow it to add new values

New functionality on explain.depesz.com, and some statistics

Some time ago Karl Bartel asked me to add ability to parse plans that were done using “ANALYZE ON, TIMING OFF". Initially I didn't see the point, but he said that explain.depesz.com allows him to hide parts of the tree, and other columns (aside from actual time) are extracted and presented in more readable way.

OK. Got his point, but was busy. Finally today committed:

Now – plans made using analyze without timing work nicely. In process also fixed display of nodes that never were executed.

And now time for some bragging, a.k.a. statistics:

Continue reading New functionality on explain.depesz.com, and some statistics