CHORE: TEST PR Performance Report control path

[Gaurav Sharma (bewithgaurav)]

Work Item / Issue Reference

ADO Work Item: AB#44819

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Summary

Disposable control canary for the merged PR Performance Report. This branch changes only an invisible README marker, so the report should complete across five environments without detecting a performance regression. This PR will not be merged.

[github-actions]

PR Performance Report

No consistent slowdowns detected across all 2 environments.

Coverage: 2 of 2 environments completed. Advisory result; does not block merging.

Environment	Status
Unix / SQL Server 2022	Completed
Unix / SQL Server 2025	Completed

Affected phases and call counts

Phase times are inclusive diagnostics and must not be added together. They identify where measured time changed, not why it changed.

No affected phases or call-count changes were recorded.

All database tasks and timings

Unix / SQL Server 2022

Database task	Before	After	Paired change	Result
Connection opening	10.287 ms	10.353 ms	+0.6%	no signal
SELECT queries	1.139 ms	1.158 ms	+2.5%	no signal
Row insertion	34.455 ms	34.234 ms	-0.5%	no signal
Executemany inserts	157.686 ms	156.455 ms	-0.3%	no signal
Fetch-all queries	172.441 ms	170.010 ms	-1.5%	no signal
Row-by-row fetching	60.764 ms	59.978 ms	-2.2%	no signal
Batched row fetching	164.873 ms	166.284 ms	+1.0%	no signal
Transaction commit and rollback	113.423 ms	113.138 ms	-0.3%	no signal
Arrow row fetching	93.539 ms	95.524 ms	+2.3%	no signal
100,000-row insertion	439.219 ms	440.155 ms	+0.0%	no signal
Row fetching in batches of 100	223.254 ms	221.300 ms	-2.0%	no signal
Row fetching in batches of 10,000	176.763 ms	188.341 ms	+6.0%	no signal
Repeated positional queries	42.175 ms	41.766 ms	-0.4%	no signal
Repeated named-parameter queries	44.379 ms	44.058 ms	-0.7%	no signal
Legacy 100,000-row insertion	353.989 ms	351.750 ms	-0.9%	no signal
Insertion with explicit input sizes	2395.449 ms	2367.766 ms	-1.7%	no signal
Joined aggregation queries	176.965 ms	178.305 ms	-0.0%	no signal
Large joined-result fetching	205.981 ms	207.649 ms	+0.9%	no signal
1.2-million-row fetching	4965.963 ms	5052.855 ms	+1.1%	no signal
Common table expression queries	5.364 ms	5.351 ms	-0.2%	no signal

Unix / SQL Server 2025

Database task	Before	After	Paired change	Result
Connection opening	97.066 ms	97.310 ms	-0.2%	no signal
SELECT queries	1.183 ms	1.157 ms	-0.8%	no signal
Row insertion	33.916 ms	33.869 ms	-0.5%	no signal
Executemany inserts	149.244 ms	153.886 ms	+2.1%	no signal
Fetch-all queries	176.091 ms	182.607 ms	+1.2%	no signal
Row-by-row fetching	62.088 ms	61.748 ms	+2.2%	no signal
Batched row fetching	166.320 ms	165.812 ms	-0.3%	no signal
Transaction commit and rollback	114.109 ms	113.579 ms	-0.4%	no signal
Arrow row fetching	95.001 ms	94.377 ms	-0.7%	no signal
100,000-row insertion	442.287 ms	452.711 ms	+1.8%	no signal
Row fetching in batches of 100	224.452 ms	223.361 ms	+0.3%	no signal
Row fetching in batches of 10,000	190.418 ms	189.386 ms	-0.3%	no signal
Repeated positional queries	41.654 ms	41.625 ms	-0.1%	no signal
Repeated named-parameter queries	44.540 ms	43.994 ms	-0.4%	no signal
Legacy 100,000-row insertion	354.250 ms	350.097 ms	-2.5%	no signal
Insertion with explicit input sizes	2377.544 ms	2357.328 ms	-0.9%	no signal
Joined aggregation queries	162.064 ms	162.618 ms	+0.4%	no signal
Large joined-result fetching	206.119 ms	230.575 ms	+11.1%	no signal
1.2-million-row fetching	5020.792 ms	5004.573 ms	-0.2%	no signal
Common table expression queries	5.084 ms	5.062 ms	-0.4%	no signal

Build, commits and measurement details

ADO build 176900

PR head: e883f2a6c57fdd52dafdfb7497b806c9e6d52aa1
Base: c963ee1ebf11a96b2dc5275b465d2a36f3f55d77
Measured merge: 6cc93e74bd2a68fa3773a2390c53fcf270b0d381

• Unix / SQL Server 2022: Python 3.12.3, x86_64, SQL 16.0.4295.3; 5 paired comparisons and 1 warmup.
• Unix / SQL Server 2025: Python 3.12.3, x86_64, SQL 17.0.5005.3; 5 paired comparisons and 1 warmup.

A consistent change requires more than 20% median paired movement, at least 1 ms between the median runtimes, and at least 80% of pairs exceeding the relative threshold in the same direction. A slowdown without enough pair agreement is reported as inconsistent.

The displayed change is the median of paired before-and-after ratios. It is not recalculated from the two displayed median runtimes.

Both revisions use profiling-enabled builds on the same agent and database, with alternating order and discarded warmups. Results are diagnostic and do not represent production-wheel latency.

Raw samples and logs are attached to the ADO run as profiler-* artifacts.

[Copilot]

🟢 Approval recommended

No unresolved issues; the change is limited to a non-rendered README marker.

Pull request overview

Adds an invisible README marker to validate the profiler report control path without changing product code.

Changes:

• Adds an HTML comment canary to README.md.

File summaries

File	Description
README.md	Adds the invisible profiler control marker.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Lite

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[github-actions]

📊 Code Coverage Report

🔥 Diff Coverage 100%

🎯 Overall Coverage 83%

📈 Total Lines Covered: 8639 out of 10295 📁 Project: mssql-python

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Diff Coverage

Diff: main...HEAD, staged and unstaged changes

No lines with coverage information in this diff.

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📋 Files Needing Attention

📉 Files with overall lowest coverage (click to expand)

mssql_python.pybind.performance_counter.hpp: 0.7%
mssql_python.pybind.logger_bridge.cpp: 57.9%
mssql_python.pybind.ddbc_bindings.h: 64.1%
mssql_python.pybind.logger_bridge.hpp: 70.8%
mssql_python.pybind.ddbc_bindings.cpp: 78.3%
mssql_python.pybind.connection.connection_pool.cpp: 82.3%
mssql_python.pybind.connection.connection.cpp: 82.5%
mssql_python.row.py: 83.4%
mssql_python.logging.py: 86.2%
mssql_python.pooling.py: 90.1%

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🔗 Quick Links

⚙️ Build Summary	📋 Coverage Details
View Azure DevOps Build	Browse Full Coverage Report

[Copilot]

🟢 Approval recommended

No unresolved issues were identified.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0 new
• Review effort level: Lite

[Copilot]

Copilot review overview

🟢 Approval recommended

The only finding is a non-blocking documentation nit; the change is limited to an invisible README marker.

Review effort: Lite
Findings: None