Question: Where is Table Variable Created?
Answer: On Hard Disk and NOT in Memory.
I suggest you read the following blogs
SQL SERVER – Regular Table or Temp Table – TempDB Logging Explained
After the blog posts about temp and regular table, I have received questions about it hence I am writing this blog post about TempDB Logging.
Query Runs Slow Occasionally: Five Checks to Find Why
When a query runs slow occasionally, the cause sits around the query: a lock, a job, a file growth, tempdb or a shortage of worker threads. This post gives one tested T-SQL check for each and a small demo for blocking and file growth. It also says what to do when all five checks find nothing.
Remove Extra tempdb Files in SQL Server Safely
To remove extra tempdb files, empty each file first with DBCC SHRINKFILE and then remove it with ALTER DATABASE. This post checks the file count and the allocation waits before you start, rehearses both steps on a demo database, shows the tempdb statements with their undo, and explains why emptying can fail.
Shrink tempdb Without Restarting SQL Server
To shrink tempdb without a restart, run DBCC SHRINKFILE against each tempdb file with a target size in megabytes. This post checks the file sizes and the space use first, shows the statement with its undo, and tests the shrink rules on a demo database, so the tempdb server stays untouched.
Temp Table Scope in Dynamic SQL: Who Can See What
Temp table scope decides what dynamic SQL and stored procedures can read. Tested demos show a child reading a parent table, a procedure that fails without it, a dynamic table shape and the error a typo causes. A card lists the rules.
Dynamic SQL Temp Table: Why It Disappears and How to Keep It
A dynamic SQL temp table is dropped when its dynamic batch ends, so the main code cannot read it. A global temp table keeps the data, and a per session name keeps it safe. Every step is tested, including the second session clash.