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
When a query is run in the Query Tool, check if the source of the columns
can be identified as being from a single table, and that we have all
columns that make up the primary key. If so, consider the resultset to
be editable and allow the user to edit data and add/remove rows in the
grid. Changes to data are saved using SAVEPOINTs as part of any
transaction that's in progress, and rolled back if there are integrity
violations, without otherwise affecting the ongoing transaction.
Implemented by Yosry Muhammad as a Google Summer of Code project.
- Reformat source so it's wrapped.
- Standardise markup.
- Center images.
- Restructure in various places to improve the indexing.
- Remove duplicated Query Tool toolbar descriptions.
- Ensure the structure works in both HTML and LaTeX.
