Get MySQL sample databases Sakila, World, and Employees. Follow Windows install steps, verify each import, and choose the right dataset.
SQL SERVER – SSMS Install Error 0x80070652 – Setup is Blocked Due to Another Install Currently running. Please Let the Other Install Complete and then Restart the Computer if Necessary
SSMS install error 0x80070652 says setup is blocked due to another install currently running. Here is what fixed it for me.
Index Design Rules: Ten Don’ts and Where They Break
These index design rules came from a client’s list of ten index don’ts, and readers argued with several of them. This post turns the checkable rules into read-only queries on a demo database, and it measures what each rule really costs. The rest are warnings, not laws, and the post says which is which.
OPTION FAST N: First Rows Sooner, Total Reads Higher
OPTION FAST N tells SQL Server to plan for the first N rows, so the first rows arrive in milliseconds and the whole result costs much more. This post measures both sides on 300,000 rows with logical reads and time to the first row. It also explains why the hint belongs to paging and not to tuning.
What is the Replacement of DBCC DBREINDEX? – Interview Question of the Week #263
Question: What is the Replacement of DBCC DBREINDEX?
Answer: The answer to this question is very simple.
Here is the syntax:
Always On Listener Creation Failure: Enabling Object Failed With Error 5
A listener creation failure with error 5 means access was denied, and the cluster log shows who was denied. Here the cluster computer object could not enable the listener object. A domain admin gave it Full Control, and the listener came online.
DISABLE_OPTIMIZER_ROWGOAL: How a Row Goal Changes the Plan
DISABLE_OPTIMIZER_ROWGOAL switches off a row goal, the optimizer’s bet that a query needs only a few rows, and TOP, FAST, IN and EXISTS all place that bet. This post reads the estimates behind it, shows how the plan shape changes, and shows when the bet fails. A covering index fixes the failure, and the hint does not.