SQL Server 2005 Performance Dashboard Reports show CPU, IO, blocking and missing index problems as they happen. How to set them up and read them well.
SQL SERVER – TempDB is Full. Move TempDB from one drive to another drive.
When TempDB is Full, I investigate capacity and usage before moving its files. A move requires a planned restart.
STUFF Boundaries: Insert Text and Handle NULL Results
STUFF boundaries govern insertion and deletion. See valid positions, zero length, NULL replacement and out-of-range starts.
SQL SERVER – Index Seek Vs. Index Scan (Table Scan)
Index Scan retrieves all the rows from the table. Index Seek retrieves selective rows from the table.
SQL SERVER – Difference between DISTINCT and GROUP BY – Distinct vs Group By
What is the difference between DISTINCT and GROUP BY? They usually produce the same plan. Use GROUP BY for aggregates and DISTINCT to remove duplicates.
SQL SERVER – Fix : Error 8101 An explicit value for the identity column in table can only be specified when a column list is used and IDENTITY_INSERT is ON
Error 8101 means you gave a value for an identity column. What IDENTITY_INSERT does, why there are two different errors, and why TRY CATCH misses it.
SQL SERVER – Fix : Error 701 There is insufficient system memory to run this query
For Error 701, insufficient system memory, compare max server memory with min server memory, check the paging file size, and free caches with DBCC commands.
SQL SERVER – @@IDENTITY vs SCOPE_IDENTITY() vs IDENT_CURRENT – Retrieve Last Inserted Identity of Record
@@IDENTITY vs SCOPE_IDENTITY() vs IDENT_CURRENT: how each one returns the last identity value, and why a trigger can make @@IDENTITY give the wrong one.
SQL SERVER – Stored Procedure – Clean Cache and Clean Buffer
Clean Cache commands affect different parts of SQL Server memory. I separate buffer-pool testing from execution-plan testing.
SQL SERVER – Fix: Error Msg 128 The name is not permitted in this context. Only constants, expressions, or variables allowed here. Column names are not permitted.
Msg 128, The name is not permitted in this context, shows up when one column is used as the DEFAULT of another. Use only constants, expressions or variables.