Here's a sample query that finds jobs that run a certain % of time over previous runs.  Naturally you can tweak the percentages and prior run counts as you prefer...

A clustered index is the table itself.  The PK may or may not be clustered.

So, technically speaking, "index space" in your context would mean non-clustered indexes, which may or may...

Oops.  I didn't subtract from the final result:

(case when [Duration]<'00:52' then '00:00' else DATEADD(SECOND, -52, [Duration]) end)

30 days was a placeholder as much as anything else.  The logic can be as simple or as complex as needed to properly translate the Duration text.  The main idea...

You should add a column to contain the duration in days.  Compute the value once when a row is inserted or deleted (using a trigger).  You don't want to have...

If I understand the desired logic correctly, then this:

alter table [DMPCRU].[dbo].[VaspianCalls] add [Hold_Time] as (iif(Duration < '00:52', '00:00', Duration))

Look at the query plan.  Is SQL able to do seeks to find the 1000 rows or does it have to scan the whole table first?

I thought there were settings for source and destination schema.  It defaults to dbo, but afaik, the two schemas do not have to be the same.

MS has a built-in standard report for Top 10 Avg or Total CPU queries, but that is a point-and-click, and I don't know of any way to store the results.

If you don't genuinely need RowNum and TotalRowNum, drop them.

If you do, you can pre-compute RowNum in the X1 table, and compute the TotalRowNum based on the pre-computed RowNums in...

There's really not a better way.  You'll need to repeat the column list for both the inserted and deleted tables for any method you use.

I'd use CROSS APPLYs to assign alias names to make the main SELECT statement and conditions easier to read and maintain.  For example:

--...prior code same as before...
DELETE...

I'd use a function.  You don't have to put in every db, you can call a function from another db.  Let's say you created a "Shared_Functions" db to store the...

Interesting.  It seems as if there is no variable data at all on a row, the entire "variable data" section of the row header is left out.  But when the...

The 2 bytes for varchar len are always present, even if the column is NULL.

NULL itself is set as one bit per column, i.e., a "NULL bitmap".  Every column will...