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Diagram titled One row, one DELETE, five places it still lives. The left panel lists the row alive: a 284 byte log record before the commit, an address at 1 colon 392 colon 0, a checkpoint writing the page, and a backup copying it out. The right panel lists what remains after the delete: the ghost record still 184 bytes, log records, the statistics histogram that names the row, deallocated pages, and every backup.

The Migration of a Row: Tagged, Followed, Found Again

September 21, 2026
Pinal Dave
SQL Tips and Tricks
Best Practices, Database, Developer, SQL Server

I followed the migration of a row through SQL Server 2025, from the first write to the grave. The log gets there before the table. The delete does not erase anything. And when the table is empty and the ghost is gone, the statistics histogram still names the row in full.

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Three views of tea: stirring with a spoon, swirling after removal, and gradually settling.

Navier-Stokes Problem: What It Is and What AI Found

September 18, 2026
Pinal Dave
AI
AI, Mathematics

The Navier-Stokes problem in plain words: what the famous fluid question asks, what AI says it found, and why it is not official yet.

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Gravel path illuminated at night.

Your Index Rebuild Maintenance Plan Is Rebuilding Indexes Nobody Uses

September 17, 2026
Pinal Dave
SQL Performance
Maintenance Plan, SQL Index, SQL Statistics

Your index rebuild maintenance plan takes four hours every Sunday, fills the log and delays the backup. It may be buying you far less than everybody assumes.

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An execution plan showing SELECT, Top and Index Scan, all carrying 17 rows with no warnings, beside a properties panel where Estimated Rows Read says 25 and Actual Rows Read says 5,000,000

AI Execution Plan Analysis: I Gave It My Plan and Asked What Was Wrong

September 16, 2026
Pinal Dave
SQL Performance
Parameter Sniffing, Recompile, SQL Statistics

I handed AI a plan with no warnings and healthy numbers, yet it read five million rows to return seventeen. That is the real test of AI execution plan analysis.

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Surreal miniature technicians repair a cracked coffee cup beneath an ordinary breakfast, making hidden maintenance visible.

Y2K: The Work Behind “Nothing Happened”

September 15, 2026
Pinal Dave
SQL Tips and Tricks
DBA, Y2K

Y2K did not end in worldwide disaster. Its repairs, failures, and recoveries show why, and what database teams can learn about proving maintenance matters.

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Fermat Left a Note in a Margin. Other People Spent 358 Years Finishing It.

Fermat Left a Note in a Margin. Other People Spent 358 Years Finishing It.

September 14, 2026
Pinal Dave
AI
Mathematics

That note kept mathematicians busy for the next three and a half centuries. Let us talk about what Fermat left in a margine.

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Every Database Has These Seven Tables

Every Database Has These Seven Tables

September 11, 2026
Pinal Dave
SQL Tips and Tricks
SQL Humor

Walk into any company, open the production database, and you will find the same seven tables. Nobody planned it, and I have personally created four of them.

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