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Fixes # 4778 - Implement the query plan analyzer

Browse Source 
Look 'n' Feel and implementation logic are inspired from
'http://explain.depsez.com'.

It now creates three tabs under the 'Explain' panel when executing a
query using the Explain Analyze/Explain button from the toolbar of the
Query tool.

Graphical
---------
-> Graphical Explain Plan

Analysis
--------
-> Table to show details of the explain plan analyse.
-> Each row represents the statistics per Explain Plan Node
-> It may contains columns like node information, exclusive timing
   (time spent for this explain node excluding the child nodes),
   inclusive timing, actual rows, plan rows,
   rowsx (misestimation between planned vs actual rows), loop.
-> Background color of exclusive, inclusive, rows changes based on
   their values.
i.e.
If Percentage of exclusive, and inclusive timings of total query time
is:
> 90 - Red Color
> 50 - Orange (Between Red & Yellow Color)
> 10 - Yellow color

If planner misestimation for the rows is
> 1000 times - Red Color
> 100 times - Orange (Between Red & Yellow Color)
> 10 times - Yellow Color
Also - if actual rows <= planned rows then it shows up arrow, else it
shows down arrow.

Statistics
----------
-> It contains a HTML table for the statistics per Node Type, and
   a HTML table for the statistics per table.

Reviewed by: Akshay Joshi
This commit is contained in:
Ashesh Vashi
2019-10-08 16:33:25 +05:30
parent 1e4fd552ac
commit 6e4923d762
12 changed files with 1138 additions and 380 deletions
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docs/en_US/release_notes_4_14.rst
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@@ -10,6 +10,7 @@ New features
************
| `Issue #3009 <https://redmine.postgresql.org/issues/3009>`_ - Added Copy with headers functionality when copy data from Query Tool/View Data.
| `Issue #4778 <https://redmine.postgresql.org/issues/4778>`_ - Implemeted the Query Plan Analyser.
Housekeeping
************
@@ -31,4 +32,4 @@ Bug fixes
| `Issue #4768 <https://redmine.postgresql.org/issues/4768>`_ - Ensure pgAdmin should work behind reverse proxy on a non standard port.
| `Issue #4769 <https://redmine.postgresql.org/issues/4769>`_ - Fix query tool open issue on Internet Explorer.
| `Issue #4777 <https://redmine.postgresql.org/issues/4777>`_ - Fix issue where query history is not visible in the query history tab.
| `Issue #4780 <https://redmine.postgresql.org/issues/4780>`_ - Ensure the search path should not be quoted for Function, Procedure and Trigger Function.
| `Issue #4780 <https://redmine.postgresql.org/issues/4780>`_ - Ensure the search path should not be quoted for Function, Procedure and Trigger Function.