Knowing the data size for a specific set of data in a table

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I have a table where in I store data for every client we have. So, the column used to know which rows belong to which client is through the client_id column

Now, can I have a way to determine the data size in the table for a specific client_id?

Thanks Rathi

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There is no such way to check the size for specific ID. But there is a work around for that.

Insert your records for client_id in an empty table and check the space of that table using the command:

sp_spaceused newtablename

This will give you the output like:

name rows reserved data index_size unused TEST 18484 8504 KB 7800 KB 632 KB 72 KB

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If you mean you want to know how many rows are associated with each client, then you can do something fairly simple like this:

SELECT client_id, COUNT(client_id) num_of_items 
FROM yourtable 
GROUP BY client_id

Demo: https://dbfiddle.uk/?rdbms=sqlserver_2017&fiddle=6ac9df5ae21a9be70fcb3a616c805444

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Comments
  • Did you means disk/resultset data size or did you simply meant that you want to count records.. Question is not totally clear.. See Why should I provide a Minimal Reproducible Example for a very simple SQL query?
  • I meant the disk/resultset data size
  • @RedDevil's answer should give the disk size, but for the resultset i think you need to write estimating function.. If you want it more preciese you need to reverse engineer a SQL Server client plugin or study the protocol to figure out how large a resultset is protocol wise..
  • Thanks Gordon. Based on Red Devil's answer below, does the data column produced by sp_spaceused newtablename give me the bytes of data of only the rows and not the table?
  • @RathiRao . . . It returns lots of information, including the total amount of space and the total amount of space used by data and by indexes.
  • Thanks Gordon. Should I then use the data column as the actual space consumed by the table rows only?
  • ADyson, thank you, I need the data size of a particular client. Not the number of rows
  • Please give a precise definition of "data size" then. You mean the number of bytes used to store the data for the all the rows associated to a specific client ID, or something?
  • Yes, I meant the number of bytes of data for the rows associated for a particular client_id
  • @RathiRao I see. I think you should read Gordon's answer carefully. Due to the way SQL Server's storage system is implemented it is not quite as simple as that.