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In fact, this is precisely what SQL will do in our example by reading from the clustered index to drive the updates. Because the clustered index isn’t sorted by Salary in any way, updates during the processing phase don’t affect the row location and the problem does not arise. This ...
what does this signify ? NVarchar(max) NVARCHAR(MAX) return type value in User defined function truncated nvarchar(max) still being truncated nvl in sqlserver OBJECT_ID for a PK or Index OBJECT_ID('tempdb..#foo') objectlock lockPartition=0 - does that mean lock partitioning is turned on?
To handle this case, SQL Server builds an execution plan that has conditional logic, referred to as dynamic filters, to control which member table is accessed, based on the input parameter value. Assuming the GetCustomer stored procedure was executed on Server1, the execution plan logic can be...
In the above script,ROLLBACKis used to prevent an update from actually making changes to the Employee table. You can find more info inWhat does BEGIN TRAN, ROLLBACK TRAN, and COMMIT TRAN mean?. The CASE expression can return any data type, but you must be careful of data types being ...
When generating an execution plan for a query, the SQL Server optimizer attempts to choose a plan that provides the fastest response time for that query. Note that the fastest response time doesn’t necessarily mean minimizing the amount of I/O that is used, nor does it necessarily mean usin...
comes directly from the way a LALR parser works, pushing the symbols for partially parsed rules on its internal stack and then at the end of each rule popping the symbols and pushing the new LHS symbol, which is a sequence of operations just the same as what an RPN interpreter does. ...
The perl script ora2pg dump an ORA-XXX error, that mean that your DSN or login information are wrong, check the error and your settings and try again. The perl script says nothing and the output file is empty: the user lacks permission to extract something from the database. Try to ...
What does this mean from the viewpoint of SQL Server? Well, even within the parts that don’t care about SQLOS and the underlying OS, code can express and find current thread-specific state – at a useful abstraction level – somewhere within those eighteen slots. Worker LocalStorage vs thr...