Tag: explain.depesz.com

Adding plans to explain.depesz.com from your psql

So, lately I have been thinking about integrating explain.depesz.com with psql. Currently, you have to run explain, copy the output, switch to webbrowser, go to explain.depesz.coma> site, paste output, click submit. It's not that it's a lot of work, but it can be simplified.

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Changes on explain.depesz.com

One of the features that is actually disliked is anonymization. But, regardless of the dislike – it has some users. And one of the user mailed me with information about a bug – namely – foreign table file names were not anonymized.

So, I wrote a patch, tests, released new version of underlying parsing library.

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Change in anonymization of plans on explain.depesz.com

As you perhaps know, explain.depesz.com has anonymization feature.

Couple of days ago Filip contacted me and sent a patch that stopped anonymization of typecasts.

I thought about the patch, and what it achieves, changed it's internals, but kept the effect. And today, it got released.

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Waiting for 9.2 – filtered info in explain analyze

On 22nd of September, Tom Lane committed patch:

Make EXPLAIN ANALYZE report the numbers of rows rejected by filter steps.
 
This provides information about the numbers of tuples that were visited
but not returned by table scans, as well as the numbers of join tuples
that were considered and discarded within a join plan node.
 
There is still some discussion going on about the best way to report counts
for outer-join situations, but I think most of what's in the patch would
not change if we revise that, so I'm going to go ahead and commit it as-is.
 
Documentation changes to follow (they weren't in the submitted patch
either).
 
Marko Tiikkaja, reviewed by Marc Cousin, somewhat revised by Tom

Continue reading Waiting for 9.2 – filtered info in explain analyze

explain.depesz.com update

Just updated explain.depesz.com site with new functionality – when showing parsed plan, there is new tab “stats". In there you can see some basic statistics of the query, used types of nodes, and tables that were used by it.

There are probably some problems with stats (it's new functionality, so bugs are imminent), but

As usual, some stats need to be added 🙂

  • Total count of plans in database: 18127
  • Count of private (not listed on history page) plans: 6965
  • Count of anonymized plans: 166 (this feature proved to be much less used than I thought it will be)
  • Since (including) May 2011, there are more private plans added than public ones. In June – 58.9% of all plans were private.

explain.depesz.com version 2.0

Thanks to enormous work done by Łukasz ‘metys' Lewandowski, explain.depesz.com page is no longer “desiged by depesz" (which is a code for “ugly as hell"), but is nice, and good looking.

If you like it, please do send some thank you note to Łukasz – he blogs in Polish, but he reads and understands English too.

Change is not only skin deep. The whole site has been rewritten, and uses now Mojolicious web framework instead of Catalyst.

This change should be a welcome surprise to anyone willing to setup their own copy of the site for top-secret plans from their company – mostly because number of dependencies dropped significantly.

All in all – have fun, and thanks for using the site.