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Spool operator scans the input and places a copy of each row in a hidden spool table that is stored in the tempdb database and existing only for the

<b> Density in SQL Server:</b> Density, when used to describe the data in a column, is a measure of how often duplicate values occur in that column. Another w

Note: Don't be confuse by GO 999990  keyword in below query (just used for insert multiple records)... if you have no idea about this then must re

Depending on the type of access requested, SQL Server uses different lock modes while locking resources: • Shared (S) • Update (U) • Exclusive (X) •

The following query will only return user sessions and will filter out the internal system sessions: SELECT * FROM sys.dm_exec_sessions WHERE is_user

We can easily access session detail by querying the sys.dm_exec_sessions DMV using the following query: SELECT * FROM sys.dm_exec_sessions;

SQL Server implements lock granularities at the following resource levels and in this order: Row (RID) Key (KEY) Page (PAG) Extent (EXT) Heap or B-tree (H

Best practice of creating index for performance tuning. Create indexes on the frequently used columns in the WHERE clause and the JOIN criteria of a S

SQL SERVER PERFORMANCE TUNING INTERVIEW QUESTIONS PDF FOR EXPERIENCED<b> 1). What is SQL Profiler?</b> Ans: Microsoft SQL Server Profiler is a rich graphical