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MERGE Performance for Large Upserts: UPDATE Then INSERT Instead

December 21, 2012
Pinal Dave
SQL Performance
SQL Performance, SQL Scripts, SQL Server

Is MERGE really slow, or did the rewrite just run on a quiet night? Here is a fair test you can run yourself.

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Getdate with currenttimestamp comparison.

SQL SERVER – Difference Between CURRENT_TIMESTAMP and GETDATE() – CURRENT_TIMESTAMP Equivalent in SQL Server

December 20, 2012
Pinal Dave
SQL Tips and Tricks
SQL DateTime

Is there a difference between CURRENT_TIMESTAMP and GETDATE()? No. One is ANSI SQL and the other is the T-SQL version, and both return the same value.

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A black and white clock displaying '60x60.

SQL SERVER – Select and Delete Duplicate Records – SQL in Sixty Seconds #036 – Video

December 19, 2012
Pinal Dave
SQL Video
Database, SQL in Sixty Seconds, SQL Scripts, SQL Server Management Studio

Look before you delete. This SQL in Sixty Seconds video shows one script to select duplicate records and another to delete them while keeping the latest row.

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SQL backup scenarios flow chart.

SQL SERVER – Select the Most Optimal Backup Methods for Server

December 18, 2012
Pinal Dave
SQL Tips and Tricks
SQL Backup and Restore

How to pick the optimal backup methods for your server: know the major backup types, choose a recovery model first and decide how much data you can lose.

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Writing T-SQL With an AI Assistant: What to Check Before You Run It

December 17, 2012
Pinal Dave
SQL Tips and Tricks
AI, Best Practices, SQL Scripts, SQL Server

Review T-SQL from an AI assistant for real columns, safe writes, index access, date boundaries, isolation, and rollback tests.

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SQL Bangalore: The First SQL Server User Group Meeting

December 16, 2012
Pinal Dave
SQLAuthority News
Professional Development, SQL Training, SQL User Group

SQL Bangalore, our new SQL Server user group, held its first meeting on November 24, 2012. We had five 30 minute sessions, a surprise guest from Mumbai and an international guest from the USA. Here is my report, with photographs.

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Uneven Parallelism: Spotting Skewed Threads Behind CXPACKET Waits

December 15, 2012
Pinal Dave
SQL Performance
Execution Plan, MAXDOP, Parallel, SQL Wait Stats

Diagnose uneven parallelism by comparing CXPACKET and CXCONSUMER with per-thread row counts in plans and live query profiles.

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