Tag: IDENTITY

What is a Page Split

Tables, and indexes are organized in SQL Server into 8K chunks called pages. If you have rows that are 100 bytes each, you can fit about 80 of those rows into a given page. If you update one of those

Posted in Performance, Performance Tuning Tagged with: , , , , , , ,

Corruption Challenge 1 – An alternative solution

After posting the winning solution for Corruption Challenge 1 from Brent Ozar, I realized that he and I both solved the corruption by using the REPAIR_ALLOW_DATA_LOSS option on CheckDb. A very nasty move, however it did repair the corruption.  

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Using the TSQL COALESCE Function

Here is a short video tutorial that shows how to use the COALESCE function in T-SQL on SQL Server. This was originally part of my free SQL query training for the 70-461 certification exam. Here is the first sample code

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DBCC CheckIdent

Being day six of the DBCC Command month at SteveStedman.com, today’s featured DBCC Command is DBCC CHECKIDENT. Description: DBCC CHECKIDENT is used for check on the current value in the identity column for a table.  It also reports on the

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Sessions submitted to SQL Saturday Vancouver BC

I had so much fun at SQL Saturday in Vancouver BC last year, I have decided to go again. The sessions submitted are: The “Run Faster” Switch The NO_LOCK hint is often believed to be the “Run Faster” switch, but

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How BIG is too BIG for a BIGINT IDENTITY?

After writing a recent blog post on Are you wasting half the capacity of IDENTITY, I started thinking about how much is too big for an BIGINT IDENTITY. If you don’t know about, you can get Are you wasting half the capacity

Posted in SQL 2008, SQL 2012 Tagged with: , , ,

Are you wasting half the capacity of IDENTITY?

When creating a table you can specify IDENTITY with the following syntax: For example The IDENTITY property is valid for data types of the integer data type category, except for the bit data type, or decimal data type.  So how

Posted in Database Health Tagged with: , , , , , , , ,

SQL Server 2012 – SEQUENCE

SQL Server 2012 introduces the SEQUENCE object.  Looking at the syntax it is very similar to how Oracle has implemented SEQUENCEs for many years.  I believe that the SEQUENCE was introduced to aid in the transition of Oracle developers to

Posted in SQL 2012 Tagged with: , , , , ,

Should I Use A Unique Identifier As A Primary Key?

Take the following sample code.    Four similar tables with an INT IDENTITY, BIGINT IDENTITY, and two with UNIQUEIDENTIFIERS, one using newid() and the other with newsequentialid(). Once the tables are created and we insert 100,000 rows into each, they

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