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SQL SERVER – Availability Groups Can Propagate Database Compatibility Level

February 17, 2021
Pinal Dave
SQL Tips and Tricks
AlwaysOn, Compatibility Level, SQL High Availability, SQL Mirroring, SQL Server

Propagation of Compatibility Level needs verification on the actual availability-group topology. I compare each replica through its own connection.

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Escape Text for JSON: Build Valid JSON With STRING_ESCAPE

February 16, 2021
Pinal Dave
SQL Tips and Tricks
JSON, Quotes, SQL Scripts, SQL Server, SQL String

To escape text for JSON, pass each value through STRING_ESCAPE, so JSON built by hand stays valid. A demo shows which characters it escapes and which it leaves alone. It also shows when JSON_MODIFY and FOR JSON make it unnecessary.

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Forwarded Records and Performance

Forwarded Records and Performance – SQL in Sixty Seconds #155

February 15, 2021
Pinal Dave
SQL Tips and Tricks
SQL Data Storage, SQL Heap, SQL in Sixty Seconds, SQL Scripts, SQL Server

Forwarded records make SQL Server read extra pages when it scans a heap. In this SQL in Sixty Seconds video, I explain forwarded records and performance.

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Which Tables Are Huge: Rows Versus Size in SQL Server

February 12, 2021
Pinal Dave
SQL Tips and Tricks
SQL DMV, SQL Scripts, SQL Server

Rows versus size decides which tables are huge in SQL Server. One query reads sys.dm_db_partition_stats and ranks every table twice, by rows and by size. A demo shows 300 rows that outweigh 300,000 rows, and why the older join misleads.

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SQL SERVER – Check Backup Reliability

February 10, 2021
Pinal Dave
SQL Tips and Tricks
SQL Backup and Restore, SQL Scripts, SQL Server

Backup Reliability needs a successful restore followed by integrity and application validation. Customers ask whether they can skip that exercise.

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SQL SERVER – Who Dropped Table? Part 2

February 8, 2021
Pinal Dave
SQL Tips and Tricks
SQL Log, SQL Scripts, SQL Server, SQL Server Security

A dropped table can leave transaction-log clues, but those clues are not a complete audit trail. My original investigation had limits.

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Running Totals That Reset Every Month

February 5, 2021
Pinal Dave
SQL Tips and Tricks
SQL DateTime, SQL Function, SQL Scripts, SQL Server

Calculate running totals that reset by calendar month, customer, or fiscal period, using stable ordering and explicit ROWS frames.

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