Measure NULL storage in ordinary rows, compare fixed and variable columns, inspect record size, and test sparse and compressed designs.
SQL Server emergency? Email pinal@sqlauthority.com with URGENT in the subject line.
Can Admin Rename SA Account in SQL Server? – Interview Question of the Week #256
Question: Can Admin Rename SA Account in SQL Server?
Answer: Yes, of course. The syntax for to rename SA account is very simple:
SQL SERVER – Parameter Sniffing and OPTIMIZE FOR UNKNOWN
I consider myself fortunate that I receive a follow-up question from my blog posts. Let’s discuss Parameter Sniffing and OPTIMIZE FOR UNKNOWN.
Parameter Sniffing Local Variable: What the Trick Fixes
The parameter sniffing local variable trick copies a parameter into a variable so SQL Server cannot sniff it. This post measures the estimate and the page reads of a sniffed and a local variable procedure, called in both orders. It shows what the trick fixes, and what it leaves slow.
SQL SERVER – Parameter Sniffing Simplest Example
Today we will see a very simple example of the Parameter Sniffing. Let us see a very simple example of the parameter sniffing.
NOCOUNT Performance: What SET NOCOUNT ON Saves in a Loop
NOCOUNT performance depends on the messages that SQL Server no longer sends to the client. This post counts the network packets of a procedure with a 5,000 step loop, with the setting off and on. It also explains why some tests show no time gain, and where the setting helps most.
Copy Database Without Statistics and Query Store Data
To copy database without statistics, add NO_STATISTICS and NO_QUERYSTORE to DBCC CLONEDATABASE. This post shows why that matters, because histograms and Query Store texts hold real values. It also shows the plan estimate that changes, how to make a clone writable, and what VERIFY_CLONEDB does.
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